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Showing papers on "Pervious concrete published in 2001"


DOI
01 Jun 2001
TL;DR: In this paper, the authors proposed a decompression and rapid release (DC-RR) procedure applied after normal mixing of concrete with recycled aggregate to improve the quality of transition zone between aggregate and cement matrix.
Abstract: Quality of concrete with recycled aggregate is generally lower than that of virgin aggregate. The main reason is that, recycled aggregate with its higher water absorption property has more porous mortar matrix around than that of the virgin aggregate and hence develops an inferior bond. In order to improve the quality of recycled aggregate concrete, an innovative method is proposed in this paper. High quality recycled aggregate concrete (HiRAC) can be obtained through a decompression and rapid release (DC-RR) procedure applied after normal mixing of concrete with recycled aggregate. Through the DC-RR procedure, the quality of transition zone between aggregate and cement matrix can be dramatically improved. In this paper, experimental studies are described on the effectiveness of DC-RR procedure on some of the mechanical and physical properties of recycled aggregate concrete. It was found that, by applying the DC-RR procedure, compressive strength of recycled aggregate concrete can be increased by about 20%; creep and carbonation depth can be reduced by about 20% and 30%, respectively.

19 citations


Patent
27 Sep 2001
TL;DR: In this article, the authors proposed a porous concrete molding for planting with an alkali ingredient adverse to growing of plants neutralized, having very high coefficient of permeability, and compression strength usable for regular structural member and pavement member.
Abstract: PROBLEM TO BE SOLVED: To provide a porous concrete molding for planting with an alkali ingredient adverse to growing of plants neutralized, having very high coefficient of permeability, and compression strength usable for regular structural member and pavement member. SOLUTION: The porous concrete molding for planting is a hardened body of a hydraulic composition composed of cement, rough aggregate, water, and a dispersant, wherein, an alkali ingredient is neutralized by carbonization with carbon dioxide, porosity is >=26%, coefficient of permiability is >=2.0 cm/s, compression strength is >=30 N/mm . The method for manufacturing the same is that the hydraulic composition containing cement, aggregate, water, and a dispersant is kneaded in a mixer, subjected to press and vibration forming, thereafter, cured with carbon dioxide gas.

15 citations


Patent
31 May 2001
TL;DR: In this paper, the authors proposed a water-permeable concrete which has a high permeability coefficient and high compressive strength and can easily be shaped, and the production process of the water permeability concrete comprises: charging a mixed material of a composition consisting of 100 pts.vol.
Abstract: PROBLEM TO BE SOLVED: To provide water-permeable concrete which has a high permeability coefficient and high compressive strength and can easily be shaped. SOLUTION: The production process of the water-permeable concrete comprises: charging a mixed material of a composition consisting of 100 pts.vol. of coarse aggregate and 30-80% pts.vol. of paste or mortar, into a form to obtain a formed body; and curing the formed body; wherein the paste or mortar comprises 100 pts.wt. of cement or a powdery mixture containing cement, 0-300 pts.wt. of fine aggregate, 0.1-3.0 pts.wt. (expressed in terms of solid content) of a water reducing agent or AE water reducing agent (air entraining and water reducing agent) and 20-40 pts.wt. of water. COPYRIGHT: (C)2003,JPO

10 citations


Patent
22 Jun 2001
TL;DR: In this article, a concrete material for greening is defined, which consists of a concrete having cement and an aggregate compounded therein and, added thereto as a granular filler or a powdery additive, a silica based mineral being excellent in water absorbing property, water holding property and the like.
Abstract: A concrete material for greening, which comprises a concrete material having cement and an aggregate compounded therein and, added thereto as a granular filler or a powdery additive, a silica based mineral being excellent in water absorbing property, water holding property and the like. Silica based minerals include diatomaceous earth, pearlite and other minerals containing a major amount of silica. As the aggregate, an ordinary aggregate such as crushed stones or ballast can be used. The aggregate may be used together with the above silica based filler. A light, porous concrete material can be produced by using only lightweight aggregates such as diatomaceous earth and pearlite. One or more of fibrous materials prepared by crushing bamboo, coconuts and wood material and the like and plant fiber materials such as those from Peat Moss can be added as water holding aids for supplementing the water holding property of concrete.

10 citations


Patent
02 Oct 2001
TL;DR: In this paper, a concrete block and its surface finishing method is provided by using cement for main binder-3, making gaps-4 among aggregate-2, and binding them.
Abstract: PROBLEM TO BE SOLVED: To provide a permeable concrete block and its surface finishing method and its apparatus which can process coloring on one surface by exposing aggregate on the surface by washing by high a pressure water efficiently, even when the compression strength of the concrete is high SOLUTION: The permeable block and its surface finishing method is provided by using cement for main binder-3, making gaps-4 among aggregate-2, and binding them The aggregate-2 has a percentage of wear below 40% and a compression strength of the block is at least 200 kgf/cm2 Higher pressure jet water is ejected to the surface of this concrete block-1 while using a high water pressure jet device-10, in an extent that a binder-3a on the surface is inrisible or a part of the aggregate-2 is crushed by jetting high pressured water ejected almost uniformly to the surface 1a, and the aggregate-2 in the whole surface of the concrete is exposed

7 citations


Patent
25 Jan 2001
TL;DR: In this article, the paste or mortar for placing joint of water permeable concrete comprises 100 pts. of a hydraulic material, 0 to 300 pts of a fine aggregate, 0.1 to 20 pts.
Abstract: PROBLEM TO BE SOLVED: To obtain a paste or mortar for placing joint capable of early developing adhesive strength above a fixed level and preferably used for interposing between an existing cured body (especially a pavement on a jamming traffic road) and a water permeable concrete to be placed thereupon. SOLUTION: The paste or mortar for placing joint of water permeable concrete comprises 100 pts.wt. of a hydraulic material, 0 to 300 pts.wt. of fine aggregate, 0.1 to 20 pts.wt. of a water reducing agent and 15 to 30 pts.wt. of water. The hydraulic material is a quick hardening cement comprising 20 to 60 wt.% of a clinker consisting mainly of calcium sulfoaluminate, 20 to 70 wt.% of a Portland cement clinker, 0.5 to 30 wt.% of anhydrous gypsum, 0.1 to 3.0 wt.% of an alkali metal carbonate and 0.05 to 4.0 wt.% of an organic acid, wherein molar ratio of SO3/Al2O3 is 1.0 to 1.4. COPYRIGHT: (C)2002,JPO

7 citations


Patent
13 Sep 2001
TL;DR: In this article, a cast-in-site, permeable concrete is made by paving a kneaded product of a composition comprising a coarse aggregate and 30-80 vol.% paste or mortar against the coarse aggregate.
Abstract: PROBLEM TO BE SOLVED: To provide a cast-in-site, permeable concrete which exerts good workability, even at low temperatures (around 2-10°C), and shortens a curing period. SOLUTION: The concrete is made by paving a kneaded product of a composition comprising a coarse aggregate and 30-80 vol.% paste or mortar against the coarse aggregate. The paste or the mortar contains 100 pts.mass normal Portland cement or high-early-strength Portland cement, 0.1-5.0 pts.mass ultra- fine powder, 0-150 pts.mass fine aggregate, 0.1-3.0 pts.mass water reducing agent and 15-30 pts.mass water. COPYRIGHT: (C)2003,JPO

6 citations


Patent
09 Jul 2001
TL;DR: In this paper, a two-layered porous concrete body is used as a water-permeable plate for pavement, and fine grooves are formed on the front surface of the porous body.
Abstract: PROBLEM TO BE SOLVED: To provide a porous concrete body with a cleaning function capable of effectively removing NO x which is the hazardous material in the atmospheric air or environmental hormones polluting rivers, etc., night and day and to provide a water-permeable plate which is useful for applications, such as water- permeable plates for pavement, soundproofing walls for sound absorption, environmental hormone water cleaning blocks for rivers, etc., is capable of maintaining a cleaning function to the NO x , etc., which are the hazardous material in the atmospheric air and has excellent water-permeability, strength and sliding resistance particularly when use as the water-permeable plate for pavement and an excellent barrier-free characteristic and appearance as well. SOLUTION: Titanium oxide films coated with apatite are formed on the front surface and the pore walls of the surface layer section of the porous concrete body. In the case of application as the water-permeable plate, the porous concrete body is formed of a two-layered structure and fine grooves are formed on the front surface. COPYRIGHT: (C)2003,JPO

6 citations



Patent
26 Jun 2001
TL;DR: In this paper, an instant stripping porous concrete compact is obtained in such a way that kneaded matter of a coarse aggregate and a composition of 10-80% paste or mortar in terms of vol% to the coarse aggregate is cast into a form and formed therein, the obtained compact is instant stripped, after that, it is subjected to curing.
Abstract: PROBLEM TO BE SOLVED: To provide an instant stripping porous concrete compact having a large coefficient of water permeability and strength, easy to work such as forming SOLUTION: The instant stripping porous concrete compact is obtained in such a way that kneaded matter of a coarse aggregate and a composition of 10-80% paste or mortar in terms of vol% to the coarse aggregate is cast into a form and formed therein, the obtained compact is instant stripped, after that, it is subjected to curing Wherein, the paste or the mortar contains the 100 ptswt cement or powder mixture containing cement, the 0-200 ptswt fine aggregate, the 01-30 ptswt gypsum, the 01-30 ptswt water reducing agent and the 15-25 ptswt water COPYRIGHT: (C)2003,JPO

5 citations


10 Sep 2001
TL;DR: In this article, the use of porous recycled inclusions in portland cement concrete (PCC) pavements is discussed, and three methods that have been used to reduce the noise on PCC pavements are: control of the source of noise, shielding the noise generated, and reducing the noise by controlling the noise propagation.
Abstract: The focus of this paper is on the use of porous recycled inclusions in portland cement concrete (PCC) pavements. Described is the methodology that breaks down the concrete into its major components of air voids, aggregate, and cement paste. The three methods that have been used to reduce the noise on PCC pavements are: control of the source of noise; shielding the noise generated; and reduce the noise by controlling the noise propagation. The results demonstrate that porous PCC pavements work by controlling noise propagation.

Patent
27 Jul 2001
TL;DR: In this paper, an impervious sheet and a water absorbing mat are stuck to the vertical wall surface formed of concrete, and then a water permeable concrete material is spray to the wall surface to create a water retentive growth base material.
Abstract: PROBLEM TO BE SOLVED: To provide a means for easily carrying out seeding and planting work to a concrete wall surface and enhancing the appearance of the wall surface in harmony with natural environment. SOLUTION: An impervious sheet 2 and a water absorbing mat 3 are stuck to the vertical wall surface 1 formed of concrete. A water permeable concrete material is then sprayed to the vertical wall surface 1 to form a water permeable concrete layer 4. A water retentive growth base material 5 is filled in cavity parts in the water permeable concrete layer 4. A vegetation base material containing plant seeds and the like is further sprayed onto the water permeable concrete layer 4 to form a vegetation base material layer 6. Plants then grow to plant the vertical wall surface 1. Since this seeding and planting work is performed mainly by spraying, construction is extremely easy, and since water is retained in the water permeable concrete layer 4 by the water retentive growth base material 5, the growth of plants is hastened.

Patent
13 Feb 2001
TL;DR: In this paper, a concrete flat plate is formed by laminating the common concrete plate on one surface of the porous concrete plate and 30-80% paste or mortal by volume to the coarse aggregate.
Abstract: PROBLEM TO BE SOLVED: To provide a porous concrete plates for improving the drainage of rainy water and a concrete flat plate high in sticking strength to common concrete plates and having handling strength enough to be used as a large sized flat plate such as a precast paving flat plate SOLUTION: The concrete flat plate 4 is formed by laminating the common concrete plate 3 on one surface of the porous concrete plate 2 The porous concrete plate 2 is composed of coarse aggregate and 30-80% paste or mortal by volume to the coarse aggregate The paste or mortal is composed of 100 ptswt cement or powder mixture containing cement, 0-300 ptswt fine aggregate, 0-50 ptswt high performance water reducing agent, or high performance AE(air entraining) water reducing agent, 01-50 ptswt gypsum and/or clay and 16-28 ptswt water

Patent
02 Oct 2001
TL;DR: In this paper, a concrete block with high vegetation power and water and air purification powers was obtained by fitting a common concrete, a porous concrete, and a charcoal-containing concrete into a mold for wedge blocks.
Abstract: PROBLEM TO BE SOLVED: To provide a concrete block having high vegetation power and excellent in water and air purification powers. SOLUTION: Into a mold 4 for wedge block, a common concrete, which comprises portland cement and forms wedge block body, is poured; a porous concrete is poured on it; further a charcoal-containing concrete, which contains a large amount of bamboo charcoal, is poured on the porous concrete; and these are fastened and solidified. The charcoal-containing concrete 3, which contains large amount of charcoal on its surface, porous concrete parts 2, which encloses the charcoal and has a thickness of about 10 cm, and common concrete parts 1 are integrally molded. The obtained concrete block has a large amount of spaces having excellent water permeability, air permeability and root penetrability in its inner part, and it has excellent water retainability and high vegetation power.

Journal Article
TL;DR: In this paper, a laboratory study of the behavior of concretes containing calcined clay, either as an admixture or as a component of blended cement, was conducted. But the results were limited to a parking garage at Kansas City International Airport.
Abstract: This article reports a laboratory study of the behavior of concretes containing calcined clay, either as an admixture or as a component of blended cement. The blended cement was originally formulated with a lower content of supplementary cementing material than optimum in order to be used with a Class C fly ash. The tests conducted in Phase I of this study relate primarily to the durability of concrete containing alkali-reactive aggregates and exposed to deicing salts. Phase II pertains to concretes using in the construction of a parking garage at Kansas City International Airport. Both Phase I and Phase II show the benefits of using calcined clay in concrete, either in binary mixtures or in combination with fly ash or silica fume. These stem from improvements to the pore structure of the concrete that enhance the concrete's resistance to the ingress of chloride ions and other harmful materials.

Patent
19 Jun 2001
TL;DR: In this article, a two-layer structure precast-concrete pavement slab composed of a water-permeable concrete porous layer and a waterimpermeably concrete base layer is constituted in such a manner that the porous layer is configured by at least mixing 400-600 pts.
Abstract: PROBLEM TO BE SOLVED: To provide a high-function precast-concrete pavement slab capable of preventing flood in a rainfall and reducing car noises. SOLUTION: In the two-layer structure precast-concrete pavement slab composed of a water-permeable concrete porous layer 1 and a water-impermeable concrete base layer 2, the precast-concrete pavement slab is constituted in such a manner that the concrete porous layer 1 is configured by at least mixing 400-600 pts.wt. underside-diametral coarse aggregate having grain size of 3-12 mm, 0-100 pts.wt. fine aggregate having grain size of 1 mm or less or the mixture of the fine aggregate and fine powder or powder, a 0.1-1 pts.wt. thickener, a 0.3-15 pts.wt. organic polymer, a 0-2 pts. wt. water reducing agent and 20-50 pts.wt. water with 100 pts.wt. Portland cement, and the percentage of voids, coefficient of permeability and flexural strength of the porous concrete layer 1 are 10-25%, 10-2 cm/s or more and 3 N/mm2 or more respectively.

Patent
26 Sep 2001
TL;DR: In this article, the problem of providing paste or mortar which is interposed between an existing hardened concrete and water-permeable concrete for enhancing adhesive strength between them when the waterpermeability concrete is newly cast on the existing concrete was solved.
Abstract: PROBLEM TO BE SOLVED: To provide paste or mortar which is interposed between an existing hardened concrete and water-permeable concrete for enhancing adhesive strength between them when the water-permeable concrete is newly cast on the existing hardened concrete. SOLUTION: This paste or mortar contains 100 pts.wt. cement or a powdery mixture containing cement, 0-300 pts.wt. fine aggregate, a polymer of 0.5-20 pts.wt. in terms of solid, and water of the amount satisfying that the paste or mortar falls down through the J14 funnel within 3-15 seconds. Synthetic rubber, an emulsion of a thermoplastic resin, an emulsion of a thermosetting resin and a re-emulsified powdery resin are exemplified as the polymer.

Patent
21 Mar 2001
TL;DR: In this paper, a paste or mortar for joining water-permeable concrete with concrete cured article and water-resistant concrete is proposed. But, it is not shown how to combine the water and the contraction reducing agent.
Abstract: PROBLEM TO BE SOLVED: To provide a paste or mortar which is disposed between an existing concrete cured article and water-permeable concrete to improve the adhesion strength, when the water-permeable concrete is newly built on the existing concrete cured article SOLUTION: This paste or mortar for joining water-permeable concrete comprises 100 ptswt of a cement or a powder mixture containing the cement, 0 to 300 ptswt of a small aggregate, 02 to 20 ptswt (converted into solid content) of a water-reducing agent, 001 to 02 ptwt of a retarder, 05 to 5 ptswt of contraction-reducing agent, and water in such an amount that the total amount of the water and the contraction-reducing agent is 20 to 40 ptswt The powder mixture containing the cement preferably comprises >=50 wt% of the cement and <=50 wt% of one or more kinds of inorganic powder selected from blast furnace slag powder, fly ash and silica fume

Patent
05 Feb 2001
TL;DR: In this paper, a construction method for tree-planting by field paving water permeable concrete is provided to improve a structural security and to offer environment-affinitive civil construction by integrally forming a slanted surface with a concrete construction body and creating the circumstances capable of growing of plants by paving water-permeable concrete.
Abstract: PURPOSE: A construction method for tree-planting by field paving water permeable concrete is provided to improve a structural security and to offer environment-affinitive civil construction by integrally forming a slanted surface with a concrete construction body and creating the circumstances capable of growing of plants by paving water permeable concrete. CONSTITUTION: In a construction method for tree-planting, a grid type frame(11) protruded upwardly is integrally formed with a grid type water permeable concrete construction body(10), the construction body includes a bottom plate part(12) spread in the grid type frame by paving green-concrete formed by mixing an aggregate, slag cement, water, and a mixing agent on an upper portion of a slant surface beside a river or a road of which levelling work has been stopped, and a soil-covered layer(20) is formed by paving soil and sand mixed by plant seeds over a top portion of the water permeable concrete construction body after curing.

Patent
16 Jan 2001
TL;DR: In this paper, a concrete member for pavement is provided, which is constituted of a water-permeable surface layer 1 formed of porous concrete, and a waterimpermeably substrate 2 formed of normal concrete, which supports and reinforces the former, to exhibit sufficient drainage performance and attenuate noise.
Abstract: PROBLEM TO BE SOLVED: To ensure the drainage performance of a concrete member and to exhibit noise attenuating performance at low cost, by constituting the concrete member out of a surface layer formed of porous concrete and a substrate formed of normal concrete, and supporting and reinforcing the water-permeable surface layer by the water-impermeable substrate. SOLUTION: There is provided a concrete member for pavement, which is constituted of a water-permeable surface layer 1 formed of porous concrete, and a water-impermeable substrate 2 formed of normal concrete, which supports and reinforces the former, to thereby exhibit sufficient drainage performance and attenuate noise. In this case, intercommunicating porosity of the porous concrete constituting the surface layer 1 is set to 10 to 35%, and thickness H1 of the same is set to 5 to 120 mm. Further, intercommunicating porosity of the normal concrete constituting the substrate 2 is set to 0 to 10%, and thickness H2 of the same is set to 5 to 120 mm. Therefore, the concrete member for pavement, which has sufficient drainage performance, noise attenuating effect, and strength, and produced at low cost, can be obtained. Thus, the pavement structure having drainage performance can be simplified, to thereby reduce overall construction costs.

Patent
31 Oct 2001
TL;DR: In this article, a slurry filler is injected into the voids of molded porous concrete, or a binder is dispersed in cement into a mortar shape is added to an aggregate and mixed to provide the water holding pavement body.
Abstract: PROBLEM TO BE SOLVED: To solve such problems that the conventional water retaining pavement body has a low water absorption coefficient, a continued pavement body cannot be obtained, the conventional water retaining pavement body is hard to be applied to a roadway pavement body although it can be utilized as a footpath pavement body, and the conventional water retaining pavement body has a problem in strength. SOLUTION: A slurry filler 4 that cement and a porous filler are mixed together is injected into the voids of molded porous concrete, or a binder 5 that the porous filler is dispersed in cement into a mortar shape is added to an aggregate 2 and mixed to provide the water holding pavement body 1.

Patent
05 Jun 2001
TL;DR: In this article, a premixed material for porous concrete is proposed, such as a lightweight aggregate having particle sizes of 15 to 10 mm and a specific gravity in oven-dried condition of >=20.
Abstract: PROBLEM TO BE SOLVED: To provide a material capable of being easily and rapidly executed to form porous concrete excellent in compressive strength, surface finishing, water permeability or the like for a footpath, a veranda or a rooftop part SOLUTION: A premixed material for porous concrete contains cement such as high-early-strength portland cement good in the strength development, a lightweight aggregate having particle sizes of 15 to 10 mm and a specific gravity in oven-dried condition of >=20 and, as necessary, silica sand and/or a mixing material

Patent
15 May 2001
TL;DR: In this paper, a concrete block is formed by providing a thin layer of a gelled aqueous layer of natural polysaccharide on the bottom of a form, spraying sawdust on the thin layer, placing concrete thereon, releasing the form after hardening the concrete, and washing the exposed surface to remove the easily peelable sawdust.
Abstract: PROBLEM TO BE SOLVED: To provide a concrete block with porous surface for construction of a slope face of a river bulkhead or road, which has a soft touch harmonized with the nature without white reflection of concrete, is easily covered with moss to impart a habitat for small animals, and never deteriorates the strength of the concrete body SOLUTION: This surface porous concrete block comprises a porous layer on the exposed surface of a concrete block and a sawdust inclusion layer having sawdust penetrated into a concrete layer on the lower surface of the porous layer This concrete block is formed by providing a thin layer of a gelled aqueous layer of natural polysaccharide on the bottom of a form, spraying sawdust on the thin layer of the gelled aqueous layer, placing concrete thereon, releasing the form after hardening the concrete, and washing the exposed surface to remove the easily peelable sawdust

Patent
25 Jan 2001
TL;DR: In this paper, a quick hardening type water permeable concrete is produced by molding a mixed/kneaded material of a composition comprising coarse aggregate and paste or mortar or which a volume ratio thereof to the coarse aggregate is 30 to 80%.
Abstract: PROBLEM TO BE SOLVED: To obtain a quick hardening type water permeable concrete having excellent water permeability, high flexural strength and excellent development of early age strength. SOLUTION: This quick hardening type water permeable concrete is produced by molding a mixed/kneaded material of a composition comprising coarse aggregate and paste or mortar or which a volume ratio thereof to the coarse aggregate is 30 to 80%. The paste or mortar comprises 100 pts.wt. of a hydraulic material, 0 to 150 pts.wt. of fine aggregate, 0.1 to 2.0 pts.wt. of a water reducing agent and 15 to 30 pts.wt. of water. The hydraulic material is a quick hardening cement comprising 20 to 60 wt.% of a clinker consisting mainly of calcium sulfoaluminate, 20 to 70 wt.% of a Portland cement clinker, 0.5 to 30 wt.% of anhydrous gypsum, 0.1 to 3.0 wt.% of an alkali metal carbonate and 0.05 to 4.0 wt.% of an organic acid, wherein molar ratio of SO3/Al2O3 is 1.0 to 1.4. COPYRIGHT: (C)2002,JPO


Patent
06 Feb 2001
TL;DR: In this article, a water-permeable concrete surface plate 10 is produced by kneading 1 pt. of coarse aggregate, 0.1-0.2 pt of sand and water added in an amount to get a watercement ratio of 20-30% and curing the kneaded mixture.
Abstract: PROBLEM TO BE SOLVED: To provide a water-permeable concrete pavement exhibiting a prescribed strength even by the passage of heavy vehicles. SOLUTION: A water-permeable concrete surface plate 10 is produced by kneading 1 pt.wt. of cement, 4.1-6.8 pts.wt. of coarse aggregate, 0.1-0.2 pt.wt. of a resin emulsion, sand of an amount to get a cured concrete plate having a total porosity of <=20% and water added in an amount to get a water-cement ratio of 20-30% and curing the kneaded mixture. The concrete plate is used as the upper part 10A of the surface layer and brought into close contact with a paving concrete constituting the lower part 10B of the surface layer. Rain water permeated through the upper part 10A of the surface layer is flowed down on the upper face of the lower part 10B of the surface layer and collected.

Patent
13 Apr 2001
TL;DR: In this article, the authors proposed an adhesive for mortar concrete which has excellent initial appearing properties of adhesive strength between a porous concrete board and a normal concrete board, and can produce a concrete large-sized flat board suitably usable, e.g. as a flat board for a precast pavement in a short time.
Abstract: PROBLEM TO BE SOLVED: To obtain an adhesive for mortar concrete which has excellent initial appearing properties of adhesive strength between a porous concrete board and a normal concrete (or mortar) board, and can produce a concrete large-sized flat board suitably usable, e.g. as a flat board for a precast pavement in a short time. SOLUTION: This adhesive from mortar concrete consists of rapid-curing cement containing a 100 pts.mass hydraulic material, a 0 to 300 pts.mass fine aggregate, a 0.1 to 2.0 pts.mass (expressed in terms of a solid content) water- reducing admixture and 15 to 30 pts.mass water. The hydraulic material consists of a 20 to 60 mass% clinker essentially consisting of calcium sulfoaluminate, a 20 to 70 mass% Portland cement clinker, a 0.5 to 30 mass% anhydrous gypsum, 0.1 to 3.0 mass% carbonate of an alkali metal and 0.05 to 4.0 mass% organic acid. Also, the molar ratio of SO 3 /Al 2 O 3 is 1.0 to 1.4. COPYRIGHT: (C)2002,JPO

Patent
23 Jan 2001
TL;DR: In this article, a sheet having the elasticity and 2-10 mm thickness is placed on a bottom plate of a formwork and a mutually independent granular material in a state in which a coarse aggregate is coated with an unhardened paste or an un-hardened mortar is charged thereonto.
Abstract: PROBLEM TO BE SOLVED: To provide a method for producing a porous concrete molded product by which the water permeation coefficient can be improved without deteriorating the bending strength in a porous concrete of the same formulation SOLUTION: A sheet having the elasticity and 2-10 mm thickness is placed on a bottom plate of a formwork and a mutually independent granular material in a state in which a coarse aggregate is coated with an unhardened paste or an unhardened mortar is charged thereonto The resultant granular material is then vibration molded by an external vibration at 3,000-8,000 vpm frequency and cured at <=80 degC to produce a porous concrete molded product A polyurethane sheet is used as the sheet having the elasticity

Patent
03 Jul 2001
TL;DR: In this paper, a water permeable concrete block for pavement cured by vibrationally molding a kneading material of a pavement composition composed of a coarse aggregate and mortar of 0.15 to 0.8 in the volume ratio to the coarse aggregate by external vibration having a frequency of 2,000 to 8,000 vpm.
Abstract: PROBLEM TO BE SOLVED: To provide a water permeable concrete block for pavement having a large water permeable factor even in flexural strength not less than 5.0 N/mm2. SOLUTION: In this water permeable concrete block for pavement cured by vibrationally molding a kneading material of a pavement composition composed of a coarse aggregate and mortar of 0.15 to 0.8 in the volume ratio to the coarse aggregate by external vibration having a frequency of 2,000 to 8,000 vpm, the mortar includes at least cement, pozzolan fine powder, a fine aggregate having the particle size not more than 2 mm, a water reducing agent and water.

Patent
02 Jul 2001
TL;DR: In this paper, a patterning porous concrete paving method is provided to reduce working hours by using a stencil or pattern sheet on a porous concrete surface tamped by a roller, to express various colors and shapes without lowering stiffness, to have natural beauty, and to enlarge frictional force.
Abstract: PURPOSE: A patterning porous concrete paving method is provided to reduce working hours by using a stencil or pattern sheet on a porous concrete surface tamped by a roller, to express various colors and shapes without lowering stiffness, to have natural beauty, and to enlarge frictional force. CONSTITUTION: A patterning porous concrete paving method comprises the steps of: leveling a subgrade and paving a base course; forming a porous concrete layer by using a mixture composed of aggregate for general concrete, pulverulent waste concrete, slag, etc. as aggregate, then paving 1 cubic meter of the aggregate on the basis of the optimal compaction with a mixture by mixing 200-450 kilograms per a cubic meter of cement, 80-150 kilograms per a cubic meter of water and an admixture(a water reduction agent) in less than 2 percent of the amount of cement used and tamped by a roller; sprinkle 200 kilograms of water per 100 square meters of the porous concrete paved and installing a stencil; after mixing general cement or white cement, water, etc. at a certain ratio per a cubic meter of the aggregate on the basis of the optimal compaction, then sprinkling and finishing evenly; and removing the stencil and curing the surface.