7results about How to "Good slump performance" patented technology

The invention belongs to the technical field of preparation of water reducing agents, and particularly relates to a slump-loss-free super-slow-release type water reducing agent mother solution and a preparation process thereof. The method comprises the following steps: copolymerizing a phosphoric acid functional monomer, an amide functional monomer, a polyether monomer and unsaturated carboxylic acid to obtain a mother solution of the super-slow-release water reducing agent; functional groups such as acylamino and ester groups introduced on a molecular chain of the water reducer can be slowly hydrolyzed into anion anchoring groups such as carboxyl in an alkaline environment, so that secondary adsorption of the water reducer and cement particles is promoted, and the water reducer has relatively long slump retaining performance and relatively high compressive strength.

The invention relates to the technical field of concrete, and in particular to concrete containing a polycarboxylate water-reducing agent and a preparation process thereof. In order to improve the performance of concrete, the invention prepares a polycarboxylate water-reducing agent with a carboxyl protection function. The invention introduces a large number of amide groups into the water-reducing agent, so that in the process of preparing concrete, the polycarboxylate water-reducing agent can be gradually hydrolyzed to generate carboxyl groups in an alkaline environment, and then the cement particles in the concrete are subjected to secondary adsorption, thereby prolonging the working time of the water-reducing agent on the cement particles. In addition, the invention further increases the length of the side chains in the water-reducing agent, provides steric hindrance, further prevents the aggregation between cement particles, improves the water-reducing property, thereby avoiding the solidification between cement particles, maintains the fluidity for a long time, and prolongs the construction time of the concrete.

This invention relates to the field of concrete admixtures, specifically to an anti-mud polycarboxylate superplasticizer, its preparation method, and its application. The anti-mud polycarboxylate superplasticizer provided by this invention comprises, by weight, the following raw materials: 100-180 parts of unsaturated polyether monomer, 5-10 parts of unsaturated carboxylic acid monomer, 2-5 parts of air-entraining monomer, 5-10 parts of anti-mud monomer, 10-20 parts of oxidant, 0.4-0.6 parts of reducing agent, 5-7 parts of chain transfer agent, and 150-300 parts of water; the air-entraining monomer and the anti-mud monomer have specific structures. The simultaneous introduction of specific anti-mud monomers and air-entraining monomers into the anti-mud polycarboxylate superplasticizer of this invention not only reduces clay adsorption but also provides better dispersibility and anti-mud effect at lower dosages, increasing the overall workability of concrete and improving concrete performance.

The invention discloses a terrazzo for a combined layer. The terrazzo is prepared from the following components in parts by weight: 750 to 850 parts of white cement, 100 to 160 parts of silica powder, 150 to 220 parts of calcium-silicon mineral admixture, 900 to 1100 parts of white quartz sand, 100 to 120 parts of coarse aggregate, 5 to 10 parts of alkali-resistant glass fiber, 10 to 100 parts of toner, 170 to 200 parts of water, 4 to 6 parts of modified cellulose ether, 1 to 1.5 parts of defoaming agent and 25 to 35 parts of polycarboxylate superplasticizer. The modified cellulose ether is borate crosslinking modified cellulose ether. The terrazzo decorative layer material has excellent anti-sagging performance, mechanical performance and durability, has certain thixotropy, is suitable for structural design of various special-shaped combined layers with various facades and curved surfaces, and can effectively widen the application range of terrazzo in the field of decoration-structure integrated design.

The present invention relates to a collapse-preserving polycarboxylic acid water-reducing agent prepared from an ester-terminated unsaturated polyether monomer and a preparation method thereof. The structural formula of the ester-terminated unsaturated polyether monomer is as follows: wherein R1 and R2 are (CH2) n , n is an integer of 2-8; R3 is C1-C 12 The ester-terminated unsaturated polyether monomer prepared by the present invention has various molecular structures, adjustable hydrophilicity and lipophilicity, and controllable molecular weight. Compared with the traditional collapse-retaining polycarboxylic acid water-reducing agent, the ester-terminated polyether is gradually hydrolyzed in concrete, so that the prepared water-reducing agent has a higher retention capacity.

The application discloses a super-long-time slump-retaining concrete, which comprises a cementitious material system, a light aggregate system, a composite admixture system and water; the components and their dosages in each cubic meter of the concrete include: the cementitious material system 400-450 kg, the light aggregate system 1200-1400 kg, the water 200-220 kg, and the composite admixture system 2.0-3.0% of the mass of the cementitious material system; wherein the cementitious material system takes phosphogypsum, cement, mineral powder, glass microbeads and microsilica powder as main raw materials; and the composite admixture system takes a phosphoric acid group modified retarding type polycarboxylate water reducer, a water-retention and thickening component, an alkali-activated component, an air entraining agent and water as main raw materials. The setting time of the concrete can reach 100-120 h, and the mix can still maintain good workability after 72 h, so that the realization of synchronous cutting and pouring concrete continuous wall process and the like can be effectively ensured, and the application is suitable for popularization and application.

The invention discloses a concrete water reducing agent and a preparation method thereof, and belongs to the technical field of water reducing agents, firstly, the concrete water reducing agent provided by the invention is prepared from the following raw materials in parts by mass: 72-78 parts of an aliphatic water reducing agent, 12-14 parts of a slump retaining aid, 2-3 parts of hydroxypropyl methyl cellulose ether and 4-5 parts of a retarder. The concrete water reducing agent finally prepared by adding the self-made slump retaining auxiliary agent into the aliphatic water reducing agent shows excellent slump retaining performance, and the principle is as follows: the prepared slump retaining auxiliary agent has rich phosphate groups, ester groups and nitrogen atoms, and meanwhile, the slump retaining auxiliary agent is of a macromolecular chain segment structure, so that the slump retaining effect is good, and the slump retaining effect is good. All the components play a key role in improving the slump retaining performance of the finally prepared aliphatic water reducer.