The invention belongs to the technical field of concrete additives and relates to a high freezing resistance water permeable concrete additive and a preparation method thereof The high freezing resistance water permeable concrete additive consists of the following components in parts by weight: 5-10 parts of mixing materials, 05-10 parts of a water reduction agent, 01-1 part of a thickening agent and 3-6 parts of a water repellent agent, wherein the mixing material is silicon ash or coal ash; and the granularity of the mixing material is 300-400 meshes The preparation method comprises thefollowing steps: mixing the mixing material, the water reduction agent, the thickening agent and the water repellent agent according to the parts by weight, grinding, stirring the mixed material at amedium speed till the components are uniform, and discharging The additive provided by the invention is capable of enriching fine capillary cavities and micro cracks in a cementing layer of water permeable concrete, improving the strength of a cement adhesive layer, and improving the strength of the water permeable concrete, so that the freezing resistance of the concrete is improved In addition, due to adoption of the water repellant agent, a water repellant surface is formed on the surface of the cementing layer of concrete, so that water inside the concrete can be well discharged, and thefreezing resistance and the water permeability of the concrete are improved

High freezing resistance water permeable concrete additive and preparation method thereof

The invention discloses a previous concrete improving agent. The previous concrete improving agent comprises the following raw materials in parts by weight: 80-90 parts of cement, 6-10 parts of mineral powder, 6-10 parts of silica fume and 1-3 parts of an additive, wherein the additive is a mixture of polyacrylamide, a polycarboxylate superplasticizer, a retarder, a thickening agent and redispersible gelatine powder. Meanwhile, the invention provides a preparation method of the previous concrete improving agent. The preparation method comprises the following steps: weighing the cement, the mineral powder, the silica fume and the additive in parts by weight; and mixing and uniformly stirring to obtain the improving agent. The previous concrete improving agent has the beneficial effects thatthe integral strength of previous concrete is improved, durability of the previous concrete is enhanced, and workability of the previous concrete is improved.

Previous concrete improving agent and preparation method thereof

The invention discloses a preparation method for factory-produced pervious concrete. An aggregate is poured into a concrete blender, 50% water is added for stirring for the first time, the aggregate is wetted by stirring for 30 s, then a cement material is poured into and stirred for 30 s, the remaining 50% of water is added for stirring, a reinforcing agent is poured into after stirring in the concrete blender is conducted for 30 s, and finally stirring in the concrete blender is conducted for 60 s to complete the preparation; the cementing material is P.O 42.5 ordinary Portland cement and P.O 42.5 ordinary Portland cement with 10% silica fume. According to the preparation method, by adding water for stirring twice and adding the cementing material, a mixture produces 'ball effect' duringthe stirring process, the rheological property of the concrete is improved, and the strength of the concrete can still be improved; the prepared reinforcing agent is added into the concrete, so thatthe concrete can be transported by a concrete mixer truck, the work performance is prolonged, and the strength of later use is still not lost.

Preparation method for factory-produced pervious concrete

The invention discloses a preparation method of pervious concrete for road construction. The preparation method of pervious concrete for road construction comprises the following operation steps: S1,preparing reinforced fibers; S2, preparing a basic material; and S3, mixing. According to the prepared pervious concrete, the reinforced fibers are mixed with the basic material, silicon powder is attached to basic fibers by epoxy resin and an enhancer to form reinforced limiting fibers, supporting force and structural strength of limiting are improved, when mixed with the basic material, the reinforced limiting fibers can be fixed under the effects of river sand, broken stone and a curing agent, a loosened porous structure is formed in the concrete, water permeation and water drainage are facilitated, a waterproof diaphragm can be formed in the concrete, rainwater is prevented from permeating in the material of the concrete, thus, the rainwater can be drained along the porous structure, and the water permeability is good.

Preparation method of pervious concrete for road construction

The invention relates to a tackifying and strengthening type polycarboxylic acid water reducing agent for permeable concrete. The agent comprises the following components in percentage by mass: 16-22%of a polycarboxylic acid superplasticizer aqueous solution; 1-3% of a water loss reducer aqueous solution; 0.5-1% of a retarder; 2-5% of a strength improver; 0.5-1.5% of a slurry-rich agent; and therest of water. The tackifying and strengthening type polycarboxylic acid water reducing agent for permeable concrete has the following advantages: 1. on the premise of effectively reducing the overallcost of the permeable concrete, the adhesiveness and strength of the permeable concrete are effectively improved; 2. on the premise of not affecting the strength of concrete, the viscosity of the concrete can be effectively increased; 3. the slurry-rich agent is adopted to effectively improve the wrapping property of the permeable concrete without or with a small amount of sand; and meanwhile, phosphonic acid groups are introduced into the solute of the polycarboxylic acid superplasticizer aqueous solution, and thus the double effects improve the retention property of the permeable concrete,and the working time of the permeable concrete is ensured.

Tackifying and strengthening type polycarboxylic acid water reducing agent for permeable concrete

The invention discloses a specialadmixture for pervious concrete and application of the specialadmixture. Thespecial admixture comprises the following materials in weight percent: 5 to 15 percent (solid content) of a water reducing agent; 0.1 to 1 percent of a retarder; 0.1 to 1 percent of a thickener; 15 to 25 percent of an early strength agent; 25 to 50 percent of a water-repellent agent; 25 to 50 percent of rubber powder. The admixture overcomes the problem that the existing pervious concrete is not easy to transport bya tanker, and ensures that the phenomenon of blocking cannot occur when the pervious concrete is put into a tanker after the admixture is used, has excellent service behavior after the pervious concrete is discharged from the tanker, and has excellent cohesiveness, without phenomena of bottom sealing and hole blocking.

Specialadmixture for pervious concrete and application ofspecialadmixture

The invention discloses a low viscosity large flowing degree C60 super high-rise pump concrete based on ultrafine sand compounding. The super high-rise pump concrete comprises cement, mineral powder, fly ash, ultrafine natural sand, machine-made sand, broken stone, additives, and water. The super high-rise pump concrete can be prepared by a conventional method. The concrete is characterized in that according to the characteristics of premixed concrete in Sichuan and Chongqing areas, ultrafine natural sand and machine-made sand are compounded to obtain second grade medium sand; pebble and broken pebble are compounded according to a certain ratio to 5-25 continuous grading; 28d compressive strength can reach 70 MPa or more; the slump is not less than 240 mm, the slump flow is not less than 620 mm; the slump cone time is not more than 9 seconds, and the concrete has the characteristics of high strength, low viscosity, large flowing degree, easy operation of production mode, and suitability for the pumping of a super high-rise building with a vertical height more than 350 meters.

Low viscosity large flowing degree C60 super high-rise pump concrete based on ultrafine sand compounding

The invention discloses ultrafine-sand doped low-glue self-compacting concrete and a preparation method. The concrete is prepared from a cementing material, aggregates, an additive and water, wherein the cementing material comprises cement, fly ash and ground mineral powder, and the aggregates comprise ultrafine sand, machine-made sand and gravels. The concrete is prepared from the ingredients: 252kg/m to 270kg/m of cement, 54kg/m to 70kg/m of fly ash, 54kg/m to 70kg/m of mineral powder, 232kg/m to 248kg/m of ultrafine sand, 570kg/m to 580kg/m of machine-made sand, 1,002kg/m to 1,033kg/m of gravels, 165kg/m to 173kg/m of water and 6kg/m to 7kg/m of additive, wherein the additive is a polycarboxylic acid pumping aid. According to the ultrafine-sand doped low-glue self-compacting concrete and the preparation method, the difficult problem that full-machine-made-sand concrete is poor in workability is solved; and the preparation method has the advantages that the concrete has good working properties such as stability, fluidity, cohesiveness, water retention properties and gap passing ability, the production process is simple, and the product cost is low.

Ultrafine-sand doped low-glue self-compacting concrete and preparation method

The invention discloses high-performance lithium slag pump concrete. The proportion of mixture of the concrete is cement:water:mineral powder:fly ash:lithium slag:sand:gravel:synergist: additive being (340-520):(165-200):(0-50):(0-50):(40-150):(700-850):(1,000-1,100):(2-3.5):(7-12) according to the component unit of kg/m . By means of selection of the raw materials and design of proportioning, the high-performance lithium slag concrete which is good in working performance, mechanical performance and durability and can be used for pumping is obtained.

High-performance lithium slag pump concrete

The utility model discloses a concrete permeation coefficient detection device permeates water, it includes base, base and graduated flask, the inside sealed chamber of concrete specimen of permeatingwater of having seted up of base, the base top is provided with the water inlet, the water inlet and the sealed chamber of the concrete specimen intercommunication that permeates water have insertedthe graduated flask in the water inlet, the graduated flask bottom is provided with the valve, the valve control graduated flask inside and the concrete specimen that permeates water seal the break -make in chamber, the top surface in the sealed chamber of the concrete specimen that permeates water is provided with elastic sealing element, the delivery port has been seted up to the bottom in the sealed chamber of the concrete specimen that permeates water, the base inserts in the delivery port, the wash port has been seted up on the base, after the concrete specimen that permeates water puts into sealed intracavity, surface contact under base and the concrete specimen that permeates water, the concrete specimen that promotes to permeate water goes up and moves, makes permeate water concrete specimen upper surface outer fringe and elastic sealing element contact. The device can make things convenient for permeate water concrete specimen's permeation coefficient of simple test, and sealing performance is good.

Xiang Peng

Papers

Specialadmixture for pervious concrete and application ofspecialadmixture

Low viscosity large flowing degree C60 super high-rise pump concrete based on ultrafine sand compounding

Ultrafine-sand doped low-glue self-compacting concrete and preparation method

High-performance lithium slag pump concrete

Concrete permeation coefficient detection device permeates water