66results about How to "Good resistance to segregation" patented technology

The invention discloses a self-compacting concrete and belongs to the technical field of concrete. The self-compacting concrete comprises the following components in parts by weight: 350-400 parts of cement, 54-80 parts of coal ash, 52-60 parts of slag powder, 50-62 parts of expanding agent, 9-13 parts of silica powder, 748-800 parts of mixed sand, 948-1020 parts of macadam, 140-165 parts of drinking water, 0-10 parts of compound additive and high-performance additive being 1-2% of the binding material in mass fraction. The concrete acquired according to the invention has excellent self-compacting property, fluidity, collapse prevention, cohesiveness and separation resistance, and meanwhile, a test proves that the compressive strength after 7 days is about 57MPa and the compressive strength after 28 days is about 70MPa, so that the concrete provided by the invention has higher compressive strength.

The multifunctional super concrete plasticizing agent of carboxylic acid comb grafting copolymer is prepared through the water free radical copolymerization of the following monomers: monomer A with the general expression I in 10-40 wt%, monomer B with the general expression II in 30-70 wt%, monomer C with the general expression III in 10-50 wt%, monomer D with the general expression IV in 3-15 wt%, monomer F with the general expression VI in 0-15 wt%, and reactive defoaming agent E in 0.2-2 wt% of the sum of foregoing five kinds of monomer. The present invention can reduce the shrinkage of concrete, and has good adaptability on cement and admixture material, good dispersivity and slump maintaining performance, high weeping resistance and resolution resistance, small pumping drag, product yield near 100 % and no waste produced in the production process.

The invention discloses a self-compacting non-shrinkage concrete-filled steel tube, belonging to the technical field of concrete. The self-compacting non-shrinkage concrete-filled steel tube is prepared from the following components in parts by weight: 360-400 parts of cement, 53-100 parts of coal ash, 15-35 parts of ground slag, 50-80 parts of a compound expansion agent, 700-770 parts of mixed sand, 1040-1070 parts of gravel, 150-160 parts of drinking water and a high performance admixture, wherein the amount of the high performance admixture accounts for 1.7-1.8% of the total mass of a cementing material by mass percent. The self-compacting non-shrinkage concrete-filled steel tube provided by the invention has good self-compacting property, expansibility, fluidity, slump loss resistance,cohesiveness, segregation resistance and higher compression strength; furthermore, the expansion process and strength of concrete-filled steel tube are synergistically developed.

The invention discloses self-compaction fair-faced concrete with the strength grade of C50 used for a stiffness concrete structure, belonging to the field of concrete. The mixed proportion comprises 335kg/m<3> cement, a 110kg/m<3> complex mineral additive, 40kg/m<3> coal ash, 850kg/m<3> fine aggregate sand, 910kg/m<3> coarse aggregate and additive PCA; the water-binder ratio is 0.32, the sand ratio is 48%, the dosage replacement rate of the mineral additive is 29% and the water-powder ratio is 0.82; in the unit volume of concrete, the stone occupies 31%, the sand occupies 32.5%, the stone porosity is 36.5%, the rubber powder occupies 19%, the water occupies 15.5% and the gas content is 2%. The self-compaction fair-faced concrete has the effect that the mobility, the segregation resistance and the self fallibility of the concrete meet the requirement, the appearance and colour of the molded concrete are substantially in consistency with little bubbles and dispersion. The self-compaction fair-faced concrete is simple to operate and is particularly suitable for constructing fair-faced concrete of a vertical or inclined stiffness concrete structure with dense steel bars.

The invention provides an impermeable drainage system for a cement-sand-gravel dam. The impermeable drainage system is provided with an upstream impermeable layer and a drainage layer, wherein the upstream impermeable layer is arranged on the upstream of the cement-sand-gravel dam and covers the whole upstream dam face in a laminating manner, the upstream impermeable layer is cut into a pluralityof blocks by transverse seams in the axis direction of the dam, water-stop structures are arranged at the transverse seam positions, at least one part of each water-stop structure is arranged on the surface of the upstream impermeable layer, the upstream impermeable layer is made of slurry-adding vibrating cement sand gravels or slurry enriching cement sand gravels, the drainage layer is arrangedon the downstream side of the upstream impermeable layer of the cement-sand-gravel dam and is adjacent to the upstream impermeable layer, and drainage pipes are arranged on the downstream side of thedrainage layer in the axis direction of the dam and drain leakage water penetrating the upstream impermeable layer. According to the impermeable drainage system, the cement-sand-gravel dam is more economical and environmentally friendly, and meets higher engineering design requirements for compressive strength larger than 20 MPa, anti-freeze strength meeting F300 and impervious strength larger than W10, construction is convenient and fast, the dam body impermeable effect and the dam inner drainage effect can be improved effectively, and the design method of the cement-sand-gravel dam is perfected.

The invention relates to high-concentration crumb rubber modified asphalt and a preparation method thereof, and belongs to the field of modified asphalt for road construction. Aiming at the problems that the dosage of crumb rubber is not high enough in the traditional crumb rubber modified asphalt technology, and secondary pollution and high energy consumption exist in the wet method modification, the invention adopts a crumb rubber pretreatment method to prepare modified crumb rubber, and then the modified crumb rubber and a reinforcing agent are mixed with asphalt to prepare the high-concentration crumb rubber modified asphalt with a high-speed shearing method, and the filler content of the modified crumb rubber can reach more than 50 parts. The crumb rubber modified asphalt is simple in preparation technology, high in the dosage of the crumb rubber, superior in performance and high in cost performance, and has significant social meaning and environmental protection value.

The invention discloses lightweight self-compacting concrete comprising the components of cement, limestone powder, calcined expanded clay, sintered shale ceramic sand, an air-entraining agent, a thickener, a viscosity regulator, a water-reducing agent, and water with a ratio of (450-550): (20-70): (750-900): (100-300): (1-30): (1-30): (0.1-2): (5-15): (170-210). The invention also discloses a preparation method of the concrete. The method has the advantages that: calcined expanded clay and sintered shale ceramic sand are adopted as aggregates, and the performance of the lightweight concrete is regulated by adding the air-entraining agent, the thickener, the viscosity regulator, and the water-reducing agent, such that various working performances satisfy the requirements of self-compacting concrete. The concrete has good anti-segregation performance, excellent pumping performance, self-compacting performance, and high strength. With the viscosity regulator, the production of the lightweight self-compacting concrete is more stable and efficient. Also, natural sand is not adopted as the aggregate, such that sand and gravel mining is not involved in the production, and environment-protection significance is provided.

The invention relates to a high-concentration rubber powder modified asphalt mixture and a preparation method thereof, belonging to the field of road construction asphalt mixtures. A rubber powder pretreatment method is adopted for preparing modified rubber powder against the problems that the using quantity of a conventional rubber powder modified asphalt technology is not high enough, and secondary pollution and high energy consumption exist in wet-process modification, the modified rubber powder and a reinforcing agent are mixed with asphalt and stone to prepare the high-concentration rubber powder modified asphalt mixture, and the filling amount of the modified rubber powder is above 50 parts. The preparation process of the modified asphalt mixture is simple, the using quantity of therubber powder is large, the performances are excellent and the performance-price ratio is high so as to have important social significance and environment-friendly value.

The invention belongs to the technical field of concrete admixtures in chemical building materials, and particularly relates to a preparation method of a grafted copolymer and an air-entraining and slump-retaining polycarboxylate concrete water reducer. The air-entraining and slump-retaining polycarboxylate air-entrained concrete efficient water reducer is synthesized by the following steps: introducing a double bond in the process of preparing a macromonomer with reaction activity through utilization of polyoxyalkylene ether monomers; copolymerizing a product obtained from the former step and carboxylic acid monomers and allylsulfonate monomers in a solution so as to introduce a long side chain. The preparation technology is very simple; the reaction condition is easy to control; industrial three wastes are not generated in the production process; the solvent can be recycled after being recovered; and the solvent recovery rate reaches 98%-100%, so that the economic benefits are ensured; and the environmental pollution is avoided.

The invention relates to a self-compaction rubber concrete canal lining and a preparation method therefor. The self-compaction rubber concrete canal lining comprises a canal lining main body, whereinthe canal lining main body is prepared from self-compaction rubber concrete. The lining material provided by the invention can be used for effectively improving high brittleness and low compliance ofthe conventional concrete linings and effectively improving the ductility, impervious waterproofing performance, salt corrosion resistance, freeze-thaw resistance and surrounding soil mass deformationadaptability of lining structures. In addition, the lining material can be filled and compacted in a lining die without bumping down in a poured-in-place process, so that construction steps are simplified, and the schedule of construction is accelerated. The self-compaction rubber concrete canal lining provided by the invention has better popularization and application prospects.

The invention discloses a fiber self-compact concrete composition, composite sound covolume adsorbing and separating barrier and preparing method with front end of inner cavity of sound barrier as sound adsorbing material cavity and back part as air pad cavity, which comprises the following parts: cement, sand, water, polycarboxylic dehydragent, glass fiber and polypropylene fibre with rate at 1: (1-1.5) : (0.3-0.4) : (0.0056-0.0066) : (0.005-0.015) : (0.0005-0.0015).

The invention discloses a formula and application method for a filling cementing material. The formula for the filling cementing material adopts slag and other active materials as raw materials, and main chemical components of the formula comprise SiO2, Al2O3, Fe2O3, CaO, MgO and SO3; the formula comprises the following specific raw materials of: 80.2% of the slag, 15.01% of cement clinker, 3.63%of gypsum, 0.65% of solid sodium silicate and 0.51% of an early strength agent. The formula has the following advantages that the filling strength is high, the mortar strength of the cementing material is high, and after tests are conducted, flexural strength, compressive strength and the like can reach standards of P.O 42.5 ordinary cement; it is shown by actual application results that the cementing material has strong cementation ability for fine-grained tailings, and when the same cement-sand ratio and filling concentration are adopted, the filling strength of the filling cementing material is 40-60% higher than that of ordinary cement.

The invention relates to a construction material, in particular to a high-strength non-shrinkage concrete master batch, and aims to solve the problems that: the conventional concrete production process is relatively complex and has high technical threshold; the conventional material is not suitable to be purchased and stored on a large scale because the strength of the conventional material is influenced by storage time and storage environment; and the produced product has poor high fluidity under the condition of high viscosity, and can generate segregation phenomenon when the proportion of the water is larger. The technical scheme adopted by the invention to solve the technical problems is that: mixing 9.5 percent of high-efficiency water reducing agent melamine, 76.1 percent of UEA swelling agent, 0.6 percent of antifoaming agent, 0.6 percent of methyl cellulose ether, 12.2 percent of calcium formate and 1.0 percent of subdivisible emulsion powder; sufficiently and uniformly stirring the mixed materials; grinding the obtained product in a ball grinding mill; and selecting the ground particles of which the particle diameter is controlled to between 5 and 10mu m as the master batch. The master batch is used together with portland cement, fast setting and hardening cement, sulphoaluminate early strength cement and quartz sand to produce various concretes with different application.

The invention discloses self-compacting concrete applicable to the joint section of a steel structure concrete composite beam. The concrete is prepared from the following components in parts by mass:100 to 150 parts of water, 450 to 500 parts of cement, 50 to 55 parts of a mineral admixture, 675 to 725 parts of fine aggregate, 1000 to 1100 parts of coarse aggregate, 5 to 10 parts of a high-performance polycarboxylate superplasticizer and 50 to 55 parts of a composite expanding agent, wherein the cement is ordinary Portland cement with a grade of 42.5 or above; the mineral admixture is fly ashwith a grade of national standard I or above; the fine aggregate is natural medium sand or machine-made sand; the coarse aggregate is broken stone with a particle size of 5-25 mm; the water reducingrate of the high-performance polycarboxylate superplasticizer has to be 25% or above. According to the invention, automatic compaction and no shrinkage of concrete in the joint section of a hybrid beam are realized; and the concrete has stable working performance and mechanical performance, and can be applied to concrete structure construction under occasions like construction space is narrow, only self-compaction concrete pouring can be adopted and concrete can only be conveyed from the outer side.

The invention discloses fair-faced concrete and a preparation method thereof. The concrete is prepared from the following components in parts by weight: 30-40 parts of cement, 15-25 parts of volcanicash, 3-6 parts of nano hybrid hyperbranched polymer HB-SiO2, 75-85 parts of silica sand, 85-95 parts of coarse aggregate, 3-5 parts of basalt fibers, 1-3 parts of graphene oxide fibers, 7.5-8.5 partsof a composite additive, 15-20 parts of water, 1-3 parts of a carboxyl metal organic framework, 1-3 parts of zirconium citrate and 2-5 parts of zinc oxide nanofibers. The invention also provides a preparation method of the fair-faced concrete. The fair-faced concrete provided by the invention is better in comprehensive performance, higher in compressive strength and flowability, lower in bleedingrate, better in durability, environmental protection property and decorative effect, very good in appearance, smooth in surface and less in pores.