75results about How to "Promotes early hydration" patented technology

The invention provides a superplasticizer for facilitating cement hydration. The superplasticizer is prepared by free radical copolymerization reaction of a monomer a, a monomer b, a monomer c and a modified monomer d, wherein the modified monomer d is prepared by a reaction of a monomer d and nanometer SiO2; the viscosity average molecular weight of the superplasticizer is controlled to be in a range from 30,000 to 80,000. The invention further provides a preparation method of the superplasticizer and application of the superplasticizer in promotion of the cement hydration. The preparation process of the superplasticizer is simple, the use is convenient, and the cost is low; the superplasticizer is prepared by importing superlong side chain polyester, zwitter ions and nanometer particles and can remarkably facilitate early-stage hydration of cement, so that the compressive strength of concrete is improved; furthermore, at room temperature or low temperature, the early-stage reinforcement effect is greatly remarkable, and the middle-stage and later-stage strength is stably improved; besides, the superplasticizer has stronger adaptability for materials, and is suitable for low-temperature large-mixing-amount mineral admixture concrete and prefabricated part concrete.

The invention relates to a super plasticizer for a precast concrete component, and the super plasticizer is prepared by carrying out free radical copolymerization reaction on monomer a, monomer b, monomer c and monomer d in an aqueous medium, and adding alkali compound into the reaction product for neutralization, wherein the molar ratio among the monomer a, the monomer b, the monomer c and the monomer d is 1.0:(5.0-16.0):(1.0-4.0):(2.0-6.0). Compared with the traditional high efficiency water reducing agent, the admixture has the characteristics that (1) the early hydration of the cement is obviously improved, the compression strength of the concrete is improved, and especially the early strength is improved; (2) the problem of slump loss caused by polyether long side chain belt can be greatly improved, so that the slump loss resistance of the concrete is improved, and the requirements of pumping pipe pile concrete can be met; and (3) under the condition of low amount of admixture, the super plasticizer for the precast concrete component has remarkable dispersing performance, slump-retaining capability and enhancement effect, is especially remarkable in early enhancement effect, is very remarkable in the early enhancement effect at the room temperature or low temperature, and is stable in later strength increment, thus being conductive to accelerating the turnover of templates, and accelerating the construction progress.

The invention discloses a method for preparing a special functional polycarboxylate water reducer for a PHC pipe pile. The water reducer is prepared by carrying out a free radical polymerization reaction among a macromonomer A, a small monomer B, a small monomer C and a small monomer D in a water-based medium under the action of a water-soluble redox system, wherein a molar ratio of the monomers A, B, C and D is 1:(3-9):(1-3):(1-3). The functional polycarboxylate water reducer disclosed by the invention has the advantages that (1) according to the reasonably designed polyether macromonomer, pore parameters and distribution uniformity inside hardened concrete can be obviously improved, and the compressive strength of the concrete is obviously enhanced; (2) early hydration of cement is obviously improved, and the early strength of the concrete is improved; (3) the water reducer has high dispersing capacity and dispersion retaining capacity under low mixing amount, the concrete strength is obviously enhanced, and the early strength effect is outstanding; and (4) fresh mixed concrete is good in working performance, low in apparent viscosity and convenient for construction.