Showing papers on "Pervious concrete published in 1999"

High strength porous concrete structure and method of manufacturing the high strength porous concrete structure

Abstract: This invention is intended to provide a high strength porous concrete structure which is preferably applied to a water permeable pavement, a draining pavement, a sound insulating board, a sound-proofing barrier, a sound absorbing block for acoustic, a block for plants, a riverbed block, a water purifying matrix, a gas absorbing matrix, a decorative board for building, a fish reef, a block for fish reef or a block for breeding algae and to provide a method of manufacturing the high strength porous concrete structure. The high strength porous concrete structure 1 having an arrangement in which a plurality of lumps 2 whose configuration is rough aggregates are integrally formed with the same concrete tissue and a gap 3 formed between the lumps 2 is through to a back side 2a of the lump 2 is manufactured by putting a thermoplastic material 8 into contact with a surface of a porous concrete structure 6 using rough aggregates 10 so as to form a form 9 and placing mortar or concrete 13 which does not include rough aggregates into the form 9.

Greening concrete block and secondary concrete product

Abstract: PROBLEM TO BE SOLVED: To contribute an environmental preservation and greening promotion by greening concrete blocks, basically eliminate their maintenance, reduce cost, and prevent an erosion by flowing water. SOLUTION: The surface of a porous concrete layer 20 is formed in a corrugated surface 23, and a pot part 24 forming a recessed part shape is provided on the surface side of that layer. A potted plant 30 is fitted fixedly to a space 22 and the pot part 24 of the porous concrete layer 20. The entire corrugated surface 23 of the porous concrete layer 20 is covered with a surface layer soil 41. The potted plant 30 is formed by filling soil 32 in a pot 31, and holding the root system of vegetation 33 by the soil 32.

Permeable concrete block product

Abstract: PROBLEM TO BE SOLVED: To provide a water purifying property by mixing a water purifying material in the raw material of a permeable concrete product and forming the product SOLUTION: Permeable concrete, cement, coarse aggregate, etc, are used as raw materials 2 purifying materials for water quality and soil such as shells, charcoal, zeolite, and ceramic are mixed into the raw materials 2 and processed into the concrete block product 1 If the products 1 are laid on a slope, a revetment, a walkway or a roadway, rainwater or river water passes through the products 1 On that occasion, the water is purified and toxic chemicals are filtered As the purifying materials are alkaline, acid rain is neutralized and thereby purified As neutralized water infiltrates earth 4, acid rain-spoiled land is neutralized gradually Therefore, the concrete block product serves to the improvement of polluted natural environment and contributes to normal conservation of natural environment

Porous concrete composition and porous concrete for planting base

Abstract: PROBLEM TO BE SOLVED: To obtain a porous concrete composition for a planting base, capable of being formed by a simple method of only compression by a backhoe without carrying out a vibration compaction, having a compression strength more than a certain value, and having suitable open voids. SOLUTION: This porous concrete composition comprises water, a cement, an aggregate and a cement-disperser, in a proportion regulated so that the ratio of water/cement may be 18-32%, a unit water content may be 70-120 kg/m , a unit volume of the aggregate may be 450-600 L/m and the amount of the cement disperser based on 100 pts.wt. cement may be 0.05-1.5 pts.wt. The flow value of the cement paste prepared from the composition by the method of JIS R 5201 is 150-250 mm, and the hardened porous concrete has 20-30% open porosity and >=10 N/mm compression strength after 7 day aging.

Paving of water-permeable concrete

Abstract: PROBLEM TO BE SOLVED: To effectively utilize an asphalt concrete by spreading a ready mixed concrete prepared by kneading a reclaimed asphalt concrete aggregate having a grain size capable of forming water-permeable interstices with Portland cement and water all over a road surface. SOLUTION: A ready-mixed concrete prepared by kneading a reclaimed aggregate obtained by pulverizing lumps of an asphalt concrete peeled from a pavement surface and then sieving the pulverized material and having 5-13 mm particle size with Portland cement and water, as necessary, a pigment is spread all over a road surface. Thereby, the asphalt concrete having a difficulty about disposal treatment can be utilized as the reclaimed aggregates and interstices among the aggregates of a paved roadbed concrete mutually communicate. As a result, water-permeating actions of water dropped to the surface on passing through the interstices, reaching the ground surface and permeation into the ground surface can be performed.

Vegetation concrete foundation

Abstract: PROBLEM TO BE SOLVED: To provide a vegetation concrete foundation which securely retains water and keeps the retentive condition after concrete has been placed to plant a ground or a slope face with vegetation by using a water retention agent which can be effectively filled in voids of a cured body made of porous concrete. SOLUTION: A liquid water retention agent 7 fills continuous voids of a cured body 2 made of porous concrete to form a vegetation concrete foundation 1. The water retention agent 7 fills the whole cured body 2 to effectively and sufficiently retain water. Further, seeds, fertilizer, soil, etc., are also charged together therewith into the continuous voids of the cured body 2 of porous concrete. A fiber-reinforced borrow material in which seeds, fertilizer, or the like are mixed together is sprayed thin on the surface of the cured body 2 of porous concrete to grow the roots of vegetation into the voids of the cured body 2 and secure greening on a ground, a slope face, et.

Thickening additive for water permeable concrete and production of water permeable concrete using same

Abstract: PROBLEM TO BE SOLVED: To easily produce a high strength water permeable concrete excellent in water permeability. SOLUTION: The water permeable concrete is produced using 100 pts.wt. powder of cement or the like, 0-100 pts.wt. fine aggregate, 400-600 pts.wt. coarse aggregate, 0.1-1 pt.wt. thickening additive comprising a mixture of a water-soluble cellulose ether and water-soluble polysaccharides in a weight ratio of 10:90 to 30:70, 0.3-15 pts.wt. organic polymer, 0-1 pt.wt. water-reducing agent and 20-50 pts.wt. water. The surfaces of the aggregates are previously coated with water or an emulsion of the organic polymer or the like. COPYRIGHT: (C)2000,JPO

Block for preserving ecological system and execution method therefor

Abstract: PROBLEM TO BE SOLVED: To constitute a natural environment, by laying a number of blocks in a river bed or in the area from the river bed to a slope and connecting them to form a revetment and providing habitats for aquatic creatures in the water and growing plants on vegetation bases in the land. SOLUTION: Either upper or lower face is made with ordinary concrete 12, and the other face is made with porous concrete 11 in a cubic block 10 having an arbitrary shape. Or a box-shaped body is formed with porous concrete 11 with a certain thickness and ordinary concrete is filled in the box and cured integrally, or the block 10 is formed with ordinary concrete 12 and porous concrete boards 11 are stuck on the external faces to integrally form the block 10. A number of one kind of these blocks are laid on a river bed or from the river bed to a slope and connected to each other to form habitats for aquatic creatures in the water and grow plants as vegetation bases in the land.

Vegetation base structure for planting concrete

Abstract: PROBLEM TO BE SOLVED: To form a regetation base structure having a cushioning property by spraying regetation base material with an organic material, fertilizer, elongated filament-like rubber or the like mixed therein on the surface of peanting porous concrete filled with water retaining material SOLUTION: Planting porous concrete 3 is laid on ground compoaction concrete 2, and plantation base material 4 is sprayed thereto A lawn mat 5 with a planted lawn is adhered on the planter base material 4 The porous concrete 3 is formed into a rectangular block through connection coagulation so as to form continuous gaps 8 among the aggregates 7, and then water-retaining material is filled therein The regetation base material 4 is made by adding a predetermined rate elongated filament-like rubber 41 to an organic material, fertilizer, and soil modifier, and further added with a great deal of water before being mixed and stirred The elongated filament-like rubber 41 is preferably made 5-20% in its volume rate, 05-3 mm in diameter, and 5-50 mm in length Thus, preventing the subsidence or compaction due to treadding and the like, and the healthy growth of plants can be attained

Impervious structure of tunnel wall surface

Abstract: PROBLEM TO BE SOLVED: To release the spring water from a crack through a water permeable layer and prevent the leakage by providing an impervious layer, a water permeable layer and an impervious layer on a tunnel excavated surface in order, and using a hydraulic material including an alkali-soluble polycarbonate for the water permeable layer. SOLUTION: A spray concrete 3 is formed on the excavated natural ground 2 of a tunnel 1 as a first impervious layer, and water permeable concrete 4 and spray concrete 5 as a second layer are formed thereon. As the water permeable layer, a water permeable wire rod is buried in a hydraulic material such as concrete, mortar, cement paste or the like. The water-permeable concrete 4 is formed by including a polycarbonate soluble under alkaline environment into fresh concrete which is the hydraulic material. After hardening, the polycarbonate is dissolved to form a residual cavity. The lower end of the water permeable concrete 4 is connected to a water collecting groove 8 through a conduit 9 to collect and discharge spring water out of the tunnel. Even if the spray concrete 3 is cracked, the spring water is released through the water permeable layer 4 to prevent the leakage.

Water-permeable concrete block and its production

Abstract: PROBLEM TO BE SOLVED: To provide a lightweight inexpensive water-permeable concrete block having spaces therein and useful for vegetation or afforestation by effectively utilizing coal ash. SOLUTION: This water-permeable concrete block is obtained by mixing coal ash with a small amount of dust coal, adding water to the mixture, processing the mixture into raw granules each having an arbitrary granule diameter, spontaneously burning the raw granules in a continuous kiln, mixing the obtained granules 2 with a cement paste, charging the mixture into a mold, drying the molded product, curing the molded product, and subsequently washing the product with water or neutralizing the product with a diluted weak acidic solution. Since having spaces among the granules, the water-permeable concrete block can suitably be utilized as a vegetation culture material, an afforestation material or the like, and is inexpensive.

Revetment block and production method therefor

Abstract: PROBLEM TO BE SOLVED: To improve a degree of freedom of setting a tree planting area and workability by arranging a water permeable concrete body in a hole arranged in the almost central part of a block main body. SOLUTION: A water permeable concrete body 3 is formed by placing water permeable concrete in a hole arranged in the almost central part of a block main body 2 composed of ordinary concrete. In this case, a revetment block 1 is constituted by interposing a palm fiber mat 4 between the block main body 2 and the water permeable concrete body 3. Therefore, a revetment block suitable for tree planting is formed since aquatic plants can grow wild besides the water permeable concrete is protected by ordinary concrete, so that an installing range can be freely set in the revetment block to improve a degree of freedom of design of revetment work. Two kinds of concretes can be integrally formed by maintaining water permeability of the water permeable concrete since the cement content does not pass through into palm fiber due to the palm fiber mat.

Concrete block and its manufacture

Abstract: PROBLEM TO BE SOLVED: To provide a concrete block having the area of porous concrete in its center, functioning as protection for the face of slope and also as planting ground, eliminating the fear that the porous concrete is separated, and having a beautifully finished surface. SOLUTION: A center part 20 made of porous concrete is first formed using a first form 41 and is installed on the center part 43 of a second form 42, and ordinary concrete 11 is placed around the center part 20 to form a frame 12 and a bottom 17. In this case, the ordinary concrete enters the porous concrete and is integrated therewith at the boundary 30 of the center part 20 made of the porous concrete, whereby a concrete block 10 whose center part 20 is not separated from the frame 12 can be manufactured.

Additive agent for water-permeable concrete, water-permeable concrete, and spraying method

Abstract: PROBLEM TO BE SOLVED: To provide an additive agent for a water-permeable concrete which makes spraying on roads, slopes, etc., possible, has a good water permeability, realizes high strengths, and enables the working time for uniformly levelling a sprayed concrete surface to be secured, and to provide a water-permeable concrete prepd. by using the same. SOLUTION: This additive agent, used for a water-permeable concrete contg. an aggregate having a sand percentage of 5-50%, contains an aluminum salt. Pref. the aluminum salt is aluminum sulfate. A carbonate may be incorporated into a water-permeable concrete prepd. by using this additive agent.

Strength cellular concrete structure and its producing method

Abstract: This invention is intended to provide a high strength porous concrete structure which is preferably applied to a water permeable pavement, a draining pavement, a sound insulating board, a sound-proofing barrier, a sound absorbing block for acoustic, a block for plants, a riverbed block, a water purifying matrix, a gas absorbing matrix, a decorative board for building, a fish reef, a block for fish reef or a block for breeding algae and to provide a method of manufacturing the high strength porous concrete structure. The high strength porous concrete structure 1 having an arrangement in which a plurality of lumps 2 whose configuration is rough aggregates are integrally formed with the same concrete tissue and a gap 3 formed between the lumps 2 is through to a back side 2a of the lump 2 is manufactured by putting a thermoplastic material 8 into contact with a surface of a porous concrete structure 6 using rough aggregates 10 so as to form a form 9 and placing mortar or concrete 13 which does not include rough aggregates into the form 9.

Water-retentive concrete block

Abstract: PROBLEM TO BE SOLVED: To control a temperature increase due to sunlight and dust drifting by making a concrete block in a two-layer structure made up of a compact concrete having fixed thickness in both sides and the bottom and a porous concrete in the inside center of the block. SOLUTION: Water retentive compact concrete 2 made by kneading cement, water, and aggregate (sand), is placed at the bottom portion 11 of an outer form. And then water permeable concrete 1 whose void fraction is 10 to 30% that is made by kneading cement, water, and aggregate (stone), is placed in an inner form placed in the center. And then, a water-retentive concrete block is formed by placing the concrete 1 in the part surrounding the inner form. And then a concrete block where water gathers in the center inside is prepared, gathering water suppresses a temperature increase due to sunlight and keeps the water-retentive concrete block in a condition of watered ground constantly and thereby controls drifting of dust.

Mix design method of water permeable concrete by vibrating compaction

Abstract: コンクリートの多様性を追求する様々な研究が行われてきているなかで, 多孔質コンクリートに対する開発および応用についての研究も活発になってきている. 本研究は多孔質コンクリートの一種である透水性コンクリートの振動締固め方式によって製作する場合の配合設計法を論じたものである. 透水性コンクリートは用いる環境に応じてその透水係数ならびに強度などを配合によってコントロールすることが一般に必要である. 本研究では, 設定した透水係数と強度を得るための配合設計法を構築するために, 空隙を透水性に関与する連続空隙, 透水性に関与しない閉そく空隙およびマトリックス中の気泡の3種類に分類し, セメントペーストと骨材の容積比, 骨材の実積率などを用いて, 配合諸量を決定する配合設計手法の構築を試みた.

Water-permeable concrete and its paving

Abstract: PROBLEM TO BE SOLVED: To obtain a water-permeable concrete having remarkably effects on prevention of cracking and breakage of pavement surfaces and further neutralizing actions on acid rain while maintaining required water permeation coefficient, compressive strength and bending strength in order to solve problems that the durability is not good when the strength is insufficient, especially in a flimsy ground and in a part where a load is applied in a conventional water- permeable concrete. SOLUTION: This water-permeable concrete of this invention is obtained by making the compounding ratio for each grain diameter of crushed stones used as an aggregate most optimum and kneading a slaked line, thereby neutralizing acid rain and permeating the neutralized acid rain into the ground. A wire net is further laid in an interlayer of the water-permeable concrete in order to prevent the water-permeable concrete from breaking. The surface of the water-permeable concrete is further finished with a mixture prepared by kneading natural crushed stones with a water-permeable resin to thereby prevent the surface from cracking and breaking.

Finishing method of wash-out water permeable concrete

Abstract: PROBLEM TO BE SOLVED: To provide a simple method for an excellently finishing the washout water permeable concrete. SOLUTION: The wash-out water permeable concrete is finish-processed as follows. First, the water permeable concrete is placed, next, a sheet for carrying a setting retarder (or setting retarder-containing sheet) having water infiltrating property, water holding property and capable of being deformed corresponding to the unevenness of the surface of the water permeable concrete is brought into close contact with the water permeable concrete, a setting retarder 5 or water is sprayed on the sheet so as to infiltrate the setting retarder into the surface layer of the water permeable concrete, then the water permeable concrete is subjected to aging and an uncured cement on the surface is washed away to finish the wash-out water permeable concrete. COPYRIGHT: (C)2001,JPO

Apparatus for drying large components consisting of concrete or refractive materials

Abstract: The apparatus is intended for drying large monolithic components which consist of concrete or refractive materials and are formed of a wet mass with use of a mould. Introduced into the mould, this mass (concrete, porous concrete, high density concrete etc.) is compacted, dried and possibly sintered. An energy source capable of producing heat energy is inserted into the mould so that it is located at the centre component to be produced.

Specialist concrete pavement surfaces

Abstract: This paper discusses heavy-duty concrete surfaces on major motorways and trunk roads in the UK. Whisper concrete, sometimes known as exposed-aggregate concrete, is the only rigid-surface option now permitted for all forms of construction on roads, whether high-speed or low-speed, administered by the Highways Agency (HA). The paper examines why whisper concrete has replaced conventional brushed concrete, considers the first two whisper concrete contracts in some detail, discusses three other contracts, and looks ahead at other low-noise concrete options, especially progress in developing porous concrete. In July 1992, the Government no longer permitted laying conventional concrete surfacings on roads in England with heavy traffic. The first UK trials of whisper concrete were conducted in 1993 on the A50 near Derby and the M18 in Humberside; the latter was the first trial stretch of whisper concrete in the UK. It was found that whisper concrete was about 2.2dB(A) quieter than hot-rolled asphalt and 2.9dB(A) quieter than brushed concrete; it also had at least as good skidding resistance as hot-rolled asphalt. Three other trials were conducted on the A449, A13, and M23. Several countries have conducted trials of porous-concrete as a noise-reducing concrete, and other low-noise surfaces are being tested in Japan.

Concrete grating crib and planting slope face and its construction method

Abstract: PROBLEM TO BE SOLVED: To green the surface of a concrete grating crib by providing a water permeable concrete part on the structural bearing part of reinforcing concrete for forming a concrete grating crib, and setting on the slope face of a road, dam, or the like for plantation. SOLUTION: The concrete grating crib is made into a frame structure giving a crisscross, and also a formation furnished with water permeable concrete 2 except the crossed part 3. Reinforcing bars 4 are fabricated, and crushed stone 5 and crushed stone 8 are placed to then be compacted, and then paste or mortar are poured therein for forming constructing a water permeable concrete part 2 on the part of the crushed stone 8. A structural bearing part 1 is constructed by an ordinary reinforcement concrete placing method, and immediately after that, it is preferable that the ready-made water permeable concrete part 2 is fixed integrally. Then, it is arranged on the grating crib of a road, dam, or the like in a manner permitting the patterns of the grating to almost appear, where plantation is conducted on the sections of the grating, and the surface of the water permeable concrete part 2. By this construction, the entirety of the grating crib can be finished into a plantation slope face.

Concrete for vegetation, and manufacture thereof

Abstract: PROBLEM TO BE SOLVED: To provide concrete for vegetation in which construction is easy, and in which seeds of plants can be germinated at a high germination rate to be grown. SOLUTION: Coated seeds 3 comprising seeds of plants coated with hydrophilic coating agent are engaged in dents 2 provided in an inner bottom surface of a formwork 1, porous aggregates 4 are disposed in the formwork 1 on space not occupied by the coated seeds 3, unhardened liquid high polymer material 5 is injected into gaps in the formwork 1, and it is hardened to form a cover layer 6. The cover layer 6 is pressed to an unhardened porous concrete layer which can be deformed placed in another formwork 7, and after the porous concrete layer 8 is hardened, the formwork and 7 are removed, thereby concrete 9 for vegetation comprising the cover layer 6 integrated with the porous concrete layer 8 is formed.

A fundamental study of thin bonded overlay on existing pavement using porous concrete

Abstract: Pavement using porous concrete is expected to be a promising technique with high drainage capability and low-tire/road noise property, because of its high porosity. In case porous concrete is applied to a rehabilitation technique of an existing pavement, thin bonded overlay on both ordinary jointed concrete pavements and asphalt pavements is thought to be a practical method, because most of the rehabilitation job does not allow the high raise of formation. In this technique, the bonding is the important key to success; therefore fundamental experiments and the following fields test regarding bonding were executed. In conclusions, bonding can be got through a suitable selection of bonding material and an adoption of appropriate surface treatments on the existing layer. In addition, full-depth porous concrete construction method is applicable to the thin bonded rehabilitation only with applying the bonding material in advance.