33results about How to "Control slump loss" patented technology

A multifunctional anti-cracking water-proofing agent for improving the flowability and slump of concrete, increasing the strength, impervious performance and compactness of solidified concrete, and decreasing the consumption of water is prepared proportionally from high-concentration naphthelene-series efficient water reducing agent, sodium laurylsulfate, sodium gluconate, hydroxypropyl methylcellulose, vinyl acetate-ethene copolymer emulsion and water through sequential mixing and stirring.

The compound contains water, cement, sand material, flyash. The characteristic is that it also contains compound high-efficiency water-reducing mould-protecting agen, cement is aluminate sulfide cement 500-550, flyash 50-55, water 185-195, compound high-efficiency water-reducing mould-protecting agent 11-15, weight sand ratio of sand material is 38-42 percent. the compound high-efficiency water-reducing mould-protecting agent is composed by naphthalenes high-efficiency water-reducing agent, boric acid and xylon calcium sulphonic acid, weight percentage of each compound are azyl sulfonate high-efficiency water-reducing agent 32-38, nephthalenes high-efficiency water-reducing 37-43, boric acid 12-18, xylon calcium sylphonic acid 7-13.

The invention relates to pumping impervious super-retarding concrete. The mix proportion of cement to micro-powder to sand to gravel to water to a super-retarding pumping aid of the concrete is 1:1.43:2.52:3.78:0.64:0.03, the cement is P.S.B32.5 level Portland blast furnace slag cement, the micro-powder is S75 superfine slag powder, and the super-retarding pumping aid is compounded from triethanolamine, sodium gluconate and superplasticizer according to the mass percents of 25%, 25% and 50%. The pumping impervious super-retarding concrete is high-performance concrete integrating pumpability, impermeability and super-retarding performance, has construction continuity, and meets special construction requirements. Novel and special bonding-retarding prestress is formed when the pumping impervious super-retarding concrete is applied to mass concrete construction, occlusive pile construction and a bond-free prestress cement concrete system. The pumping impervious super-retarding concrete is used for preventing cracks and cold joints and controlling slump losses during concrete construction.

The invention discloses a multifunctional pumped concrete anti-cracking waterproofing agent. The multifunctional pumped concrete anti-cracking waterproofing agent comprises a high concentration naphthalene-based high efficiency water reducing agent, lauryl sodium sulfate, sodium gluconate, hydroxypropyl methyl cellulose, sodium polyacrylate, sodium salt of methylsiloxanols, silicon dioxide, and water. The multifunctional pumped concrete anti-cracking waterproofing agent is capable of increasing early strength of mortar and concrete obviously, increasing fluidity, and improving plasticity-maintaining capability. The multifunctional pumped concrete anti-cracking waterproofing agent is suitable for waterproof mortar, waterproof concrete, and pumped concrete used in underground construction, dykes and dams, constructional engineering, and traffic engineering.

The invention relates to the technical field of concrete admixtures, in particular to a polycarboxylic acid high-performance pumping agent as well as a production process and a preparation device thereof. The polycarboxylic acid high-performance pumping agent comprises the following raw materials in parts by mass: 30-35 parts of polycarboxylic acid mother liquor, 3-5 parts of a slow release agent, 0.6-0.8 part of a high-performance viscosity modifier, 0.6-0.8 part of an anti-mud agent, 0.1-0.3 part of an air entraining agent, 0.1-0.3 part of an anti-freezing agent, 0.3-0.5 part of a water-retaining agent, 0.1-0.3 part of a defoaming agent and 20-40 parts of water. According to the polycarboxylic acid high-performance pumping agent provided by the invention, all the components have a synergistic effect, so that the prepared polycarboxylic acid high-performance pumping agent is good in flowing property, good in pumping effect and good in water reducing and retarding performance, and the slump loss of concrete can be effectively controlled; and the production process of the polycarboxylic acid high-performance pumping agent provided by the invention has the advantages of simple production process, convenience in construction, no need of special equipment, low preparation cost, high production efficiency and higher popularization and application values.

The invention provides a method for preparing a polycarboxylic concrete water reducer with high slump retention capacity. The method comprises the following steps: heating and melting a first monomer, adding a catalyst in the molten first monomer for stirring, then adding a polymerization inhibitor for continuous stirring, and then adding a second monomer; after performing thermostatic reaction on the mixture for a certain period of time, adding the second monomer, and then adding a chain transfer agent in the mixture to be evenly stirred to obtain a component 1; diluting an initiator with water to obtain a component 2; and simultaneously dripping the component 1 and the component 2 in a reaction vessel for reaction, and then adjusting the pH value of a reaction solution to be 6-8, so as to prepare the polycarboxylic concrete water reducer with high slump retention capacity. The prepared polycarboxylic concrete water reducer with high slump retention capacity has low dosage, can obviously control the slump loss, and enhance the adaptability to the cement variety, gypsum form, mixing proportion, water consumption and concrete mixing process; and the prepared polycarboxylic concrete water reducer with high slump retention capacity has good adaptability to the ambient temperature, and particularly has good slump retention capacity in high temperature.

The invention discloses a multifunctional anti-cracking water-proofing agent available for pumping concrete. The multifunctional anti-cracking water-proofing agent comprises the following components: a high-concentration naphthalene-based superplasticizer, sodium dodecyl sulfate, sodium gluconate, hydroxypropyl methylcellulose, sodium polyacrylate, sodium methylsilanolate, silicon dioxide and water. The multifunctional anti-cracking water-proofing agent provided by the invention can significantly improve the early strength of mortar and concrete, increase the liquidity, improves the plasticity maintaining capacity, is suitable for waterproof mortar and waterproof concrete of underground engineering, dams, construction engineering and traffic engineering, and is also suitable for pumping concrete.

The invention provides anti-radiation and anti-crack concrete, and relates to the technical field of concrete. The anti-radiation and anti-crack concrete comprises the following raw materials: cement, a mineral admixture, magnetite sand ore, magnetite ore, an anti-crack agent, a water reducing agent and water. The anti-radiation and anti-crack concrete is capable of effectively shielding rays, good in anti-radiation effect, high in concrete strength, not easy to crack, easy to construct, economical and environment-friendly.

The invention discloses a limestone accelerator which is prepared from the following raw materials in parts by weight: 20-24 parts of bauxite, 7-11 parts of limestone, 12-16 parts of sodium carbonate,4-8 parts of non-ionic linear high-molecular polymer and 6-10 parts of aluminum oxide. According to the scheme, by adding the nonionic linear high-molecular polymer, the aluminum oxide, silicon dioxide, an additive, latex powder, a composite flowing agent, silica fume, calcium oxide, polyamide wax, microcrystalline cellulose, an air entraining agent, cellulose ether, an ionic group, graphene oxide and a carbon nano tube, the strength required by the concrete in the early stage can be ensured; the later strength of the concrete can be guaranteed, the loss of collapse degree is reduced, the sizes of crystals in a transition region of coarse particles and an accelerator in the concrete can be effectively improved, the compactness of the crystals in the transition region is increased, the porosity is reduced, the number of microcracks in the transition region is reduced, the overall strength of the concrete is improved, and the coarse particles and the accelerator can be mixed more uniformly.

The invention relates to a slump-retaining concrete water reducing agent and a preparation method thereof. The water reducing agent comprises the following raw materials in parts by weight: 80-90 parts of a branched modified water reducing agent, 2-3 parts of a small molecular polymer, 8-9 parts of a slump-retaining auxiliary agent and 60-80 parts of water, in the preparation process of the water reducer, a branched monomer is introduced for branched modification, so that the generation of early calcium hydroxide can be inhibited, gaps are filled, and the mechanical strength is enhanced. Meanwhile, the strong adsorption capacity of phosphonic acid groups is utilized, the plastic viscosity of a system is effectively reduced, adsorption to a water reducing agent and mixing water is reduced, the dispersing performance is improved, the viscosity of concrete is reduced, the cement hydration process is delayed through the retarding effect of the phosphonic acid groups, and the long-time flow retention capacity is shown. According to the invention, a plurality of branched chains are grafted on cement, and the branched chains not only can provide a steric hindrance effect, but also can release polycarboxylic acid with a dispersion effect in a high-alkalinity environment of cement hydration to control slump loss.

The invention discloses a heating device for increasing the temperature of a stope filling body and a using method of the heating device, and relates to the technical field of stope filling. The heating device for increasing the temperature of the stope filling body comprises a first flexible retaining wall, first grouting holes, first drainage holes, a metal wire mesh and anchor rods, and the first grouting holes are formed in the first flexible retaining wall. According to the heating device for increasing the temperature of the stope filling body and the using method thereof, the heating device is more suitable for the conditions that the stope environment temperature is too low and slurry is not prone to solidification, the internal temperature of the filling body can be increased, the solidification rate can be increased, the slump loss can be effectively controlled, and the bleeding property and porosity of the filling body are reduced through the water absorption of quick lime; meanwhile, the quick lime absorbs water and releases heat, and the solidification rate of the filling body is also improved.