38results about How to "Reduce hydration temperature rise" patented technology

The invention belongs to the technical field of building materials and particularly relates to low-shrinkage, low-viscosity and ultrahigh strength concrete. Based on a single formula proportional dosage, the low-shrinkage, low-viscosity and ultrahigh strength concrete comprises the following components by weight: 250-300kg of cement, 120-180kg of microspheres, 90-120kg of mineral powder, 820-860kg of machine-made sand, 950-1000kg of gravels, 7-11kg of a water reducer and 115-125kg of water. The components are mixed with stirring for 1.5-2 minutes to obtain a concrete mixture. The concrete provided by the invention is less in binding material use, the total shrinkage percentage is less than (0.03-0.04per mill), the emptying time of an inverted slump cone is 5-10 seconds, the viscosity of mortar in same proportion is 20-28 Mp.s, the 28d compressive strength is 110-130MPa, and the 56d compressive strength is 120-135MPa. The concrete has the characteristics of being low in bonding material use, short in stirring time, excellent in working performance and low in comprehensive cost, and can be produced on a large scale and has a broad application prospect.

The invention relates to a high performance concrete material used in prestressed components of non-ballasted tracks and a preparation method thereof. The gel material is cement, the aggregate is sand and stone, the admixture is complex mineral powder, and then high efficiency water reducing agent and water are added, stirred and vibrated, thus preparing the material. The components of the complex admixture are aluminosilicate, carbonate and sulfate, and the relative weight ratios are as follows: 15 to 80 percent of the aluminosilicate, 15 to 80 percent of the carbonate and 5 to 20 percent of the sulfate, and the total weight is 2 to 6 percent of the total weight of the concrete component. The material can ensure that the early strength of the concrete can achieve the required technical indexes of the prestressed concrete component used in non-ballasted tracks, thus obviously increasing the comprehensive properties, the workability and the durability of the concrete component. By using ordinary portland cement instead of superfine cement with deficient material source and exorbitant price, the product quality in mass production can be increased and the problem of high production cost of the prestressed concrete preformed component used in non-ballasted tracks can be solved.

The invention provides four-graded roller compacted concrete suitable for water power hydraulic engineering, the four-graded roller compacted concrete per cubic meter comprises the following components: 49kg-64kg of cement, 78kg-92kg of fly ash, 70kg-71kg of water, 630kg-700kg of sand, 1520kg-1610kg of gravel, 0.98kg-1.42kg of a high efficiency water reducing agent and 0.07kg-0.14kg of an air entraining agent, the mass ratio of super large stone (80mm-120mm): large stone (40mm-80mm): middle stone (20mm-40m m): small stone (5mm-20mm) is 20:30:30:20. The four-graded roller compacted concrete is low in cementitious material use amount and low in adiabatic temperature rise, has good working performance, mechanical performance and durability, and can simplify the temperature control measures, improve the construction progress, and reduce cost.

The invention discloses a concrete with an ultrahigh content of mixed fly ash, and relates to the field of construction materials. The concrete comprises the following components in parts by weight: 48 to 60 parts of cement, 240 to 272 parts of fly ash, 656 to 696 parts of sand, 1293 to 1333 parts of broken stone, 3.0 to 4.8 parts of water reducer, 0.18 to 0.26 part of air-entrainer, and 80 to 90 parts of water. The mechanical performance and deformation performance of the concrete meet the requirements of water resources and hydropower engineering C18040 concrete and lower grades; moreover, the hydration temperature rise is lower, the anti-cracking performance is stronger, thus the happening rate of cracks in concrete is reduced, and the cost of temperature control is reduced.

The invention discloses a core-wall rockfill dam comprising gabions, self-compacting concrete, upstream geotextile, downstream geotextile, an upstream rockfill area, a downstream rockfill area, a copper sheet water stop, a concrete base, a grouting gallery and the like. The self-compacting concrete replaces a traditional clay core wall or bituminous concrete core wall. The gabions and the geotextile are used for replacing a traditional transition area. The gabions are utilized to achieve the functions of stabilizing and protecting the core wall. By means of the watertightness of the geomembrane, the seepage-proof function is achieved. According to the core-wall rockfill dam, the type is simple, dam body section partitioning is optimized, the construction speed is rapid, construction interference is little, and construction and later-period overhauling are convenient.

The invention belongs to the technical field of building materials, and particularly relates to a ballastless track base concrete slump-retaining anti-cracking material and a preparation method thereof. The slump-retaining anti-cracking material is prepared by mixing a shrinkage-reducing slump-retaining type polymer component, a retarding component, a hydration temperature rise inhibiting component, a composite anti-cracking component, a water storage component and a reinforcing and toughening component according to a certain proportion, wherein the mass ratio of each component is as follows:1.0-4.5 parts of the shrinkage-reducing slump-retaining type polymer component, 0.5-1.5 parts of the retarding component, 1-10 parts of the hydration temperature rise inhibiting component, 66-95 partsof the composite anti-cracking component, 0.5-10 parts of the water storage component and 2-8 parts of the reinforcing and toughening component. The ballastless track base concrete slump-retaining anti-cracking material provided by the invention is doped into concrete according to a proper mixing amount, the slump loss of the concrete can be avoided within 3 hours, the adiabatic temperature riseof the concrete is reduced by more than 20%, the shrinkage variation of the concrete in a plastic stage and a hardening stage is remarkably reduced, the maximum reduction coefficient of concrete cracks can reach 92%, and the anti-cracking efficiency grade reaches first grade.

The invention belongs to the field of building materials, and discloses a low-heat high-strength micro-expansion cement-based grouting material, which is prepared from the following raw materials in parts by weight: 15-25 parts of Portland cement, 20-40 parts of fly ash, 20-40 parts of granulated blast furnace slag powder, 5-15 parts of limestone powder, 1-3 parts of zeolite powder, 8-12 parts ofexpanding agent, 1.2-1.8 parts of water reducing agent and 20-30 parts of water. High-reliability dense filling and plugging of a large-size building structure in underground engineering can be achieved.

The invention relates to a high-temperature molten slag composite micropowder concrete and a preparation method thereof. The preparation method comprises the following steps: stirring and mixing cement, high-temperature molten slag composite micropowder, macadam, river sand, a water reducing agent and water, and carrying out hydration setting. Every cubic meter of the high-temperature molten slag composite micropowder concrete contains 170-360kg of cement, 100-270kg of high-temperature molten slag composite micropowder, 1000-1100kg of macadam, 650-800kg of river sand, 170-195kg of water and 4-6.5kg of water reducing agent. The high-temperature molten slag composite micropowder used as the auxiliary cementing material can effectively improve the bleeding isolation and workability of the concrete and enhance the working performance of the concrete; as compared with the cement concrete, the long-term folding strength, cleavage strength and chlorine ion penetrating resistance are greatly enhanced, thereby being beneficial to improving the toughness and durability of the concrete; and the high-temperature molten slag composite micropowder concrete lowers the cost, and has the advantages of energy saving and environment friendliness.

The invention discloses biological ash portland cement with low probability of cracking and a production method of the biological ash portland cement. The biological ash portland cement is prepared from the following components by weight percent: 55-75% of ordinary Portland cement clinker, 4-8% of flue gas desulfurization gypsum, 4.5-10.0% of humus, 7-15% of biological ash, 1-3% of polyvinyl alcohol, 5-10% of gravel powder, 5-8% of zeolite powder and 0.2-1.0% of a biological bacterium additive. The biological ash portland cement can permeate into fine seams among cement seams, stratum and a sleeve joint, has favorable cement squeezing, leakage stopping and tiny gap filling functions for easy-to-leak layers, vertically fractured stratum or porous stratum, and meets the actual application demands; and the compactness and the strength of cement paste are enhanced, and the cement paste based on biological ash is a very good culture medium of biological bacteria.

The present invention relates to a preparation method of concrete containing fly ash and silt. The preparation method comprises: taking 30-35% by weight of gravel, 10-20% by weight of cement, 15-25% by weight of yellow sand, 8-10% by weight of a component A, 3-5% by weight of component B, 0.1-1% by weight of an efficient water reducer, 5-10% by weight of a component C, and 8-10% by weight of water, placing the component A, the component B, the component C, the gravel, the yellow sand and the cement in a concrete stirrer, stirring for 1 min, uniformly mixing the water and the efficient water reducer, pouring the mixture of the water and the efficient water reducer into the concrete stirrer, and carrying out mixing stirring for 3-5 min to obtain the concrete. According to the present invention, the cement consumption is reduced, the low-carbon concrete is prepared, and the hydration heat of the concrete can be significantly reduced so as to reduce the hydration temperature increase of the concrete and reduce the shrinkage caused by the cement hydration, such that the cement consumption is reduced, and the consumption of the slag and the fly ash is increased so as to utilize the more solid waste and provide the environmental protection advantage.

The invention discloses low-shrinkage and low-viscosity high-strength concrete. The low-shrinkage and low-viscosity high-strength concrete is prepared from the following raw materials in parts by weight: 80 to 95 parts of microsphere, 75 to 90 parts of pottery sand, 50 to 65 parts of cement, 45 to 60 parts of mineral powder, 40 to 55 parts of ultrafine slag silicon ash, 25 to 40 parts of carbon fiber, 25 to 40 parts of fiber bar, 15 to 30 parts of a compound foaming agent, 5 to 20 parts of an efficient water reducing agent and the balance of water; a preparation method of the low-shrinkage andlow-viscosity high-strength concrete comprises the following steps: adding the microsphere, the pottery sand and the cement into a stirring machine in sequence according to the weight part; then adding the mineral powder, the ultrafine slag silicon ash and the carbon fiber in sequence and stirring for 20 to 35min to obtain a mixed solution A; adding the fiber bar into a crushing machine accordingto the weight part and crushing; then adding into the mixed solution A to obtain a mixed solution B; adding the compound foaming agent, the efficient water reducing agent and the water into the mixedsolution B in sequence; foaming and naturally airing at 135 to 140 DEG C to obtain the low-shrinkage and low-viscosity high-strength concrete. According to the low-shrinkage and low-viscosity high-strength concrete, concrete shrinkage cracks are reduced by adopting the fibers; the microspheres are used for improving the viscosity of the ultrahigh-strength concrete and the flowability is improved;the high-strength concrete can be widely applied to the field of construction engineering and has good performance.

The invention discloses C80 concrete prepared from stone chips, the preparation materials of the concrete comprise a cementing material, coarse aggregate, a water reducing agent, water and high-calcium stone chips, the dosage of the cementing material is 580-600kg/m < 3 >, and the water-binder ratio is 0.22-0.26. The C80 concrete has the beneficial effects that the stone chips with the average particle size of less than 4.75 mm are adopted, and stone powder contained in the stone chips can fill cement particle gaps; the gel compactness is improved, the surface energy is relatively low, the dispersion is easy, and the water requirement for achieving the same liquidity is low; the problem of lack of high-quality fly ash can be solved by blending ultrafine stone powder in the stone chips andslag powder to prepare high-performance concrete; river sand is replaced with the stone chips of mine production stone to serve as fine aggregate, the problem that no high-quality river sand is used for preparing high-strength concrete in mountainous areas is solved, environmental protection and sustainable development of building materials are facilitated, and huge economic benefits are achieved.

The invention provides anti-cracking cement, which is prepared from the following components in parts by weight: 40 to 60 parts of cement clinker, 10 to 40 parts of fly ash, 10 to 40 parts of phosphorus slag, 5 to 15 parts of phosphogypsum and 1 to 15 parts of magnesium oxide, wherein the phosphogypsum is prepared by treating phosphorite with sulfuric acid to prepare phosphoric acid, collecting solid waste residues produced in the preparation process, and calcining the solid waste residues at a high temperature of 800 to 1,000 DEG C, thus preparing the phosphogypsum.

The invention provides machine-made sand C30 pumping concrete and a preparation method thereof. The concrete is prepared in parts by weight. One cubic meter of concrete is prepared from the following components in parts by weight: 200-300 kg of P.O 42.5, 50-90 kg of fly ash, 100-180 kg of water, 800-1000 kg of machine-made sand, 900-1200 kg of broken stones, 100-200 kg of a mud blank, 8-10 kg of a water reducing agent, 32-50 kg of rare earth porcelain sand and 10-18 kg of a compound thickener. The concrete prepared with a formula provided by the invention has the advantages of strong strength, good peaceability, strong fluidity and bleeding segregation.