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通过调整Na2SO4,K2SO4,Na2CO3及K2CO3溶液浓度来改变水泥浆体中可溶性碱含量,研究可溶性碱对萘系减水剂吸附-分散性的影响.结果表明:碱金属盐对萘系减水剂分散性的影响存在最佳掺量区间,这一掺量区间与萘系减水剂掺量及碱金属盐种类相关.当萘系减水剂掺量较小时,较低掺量的碱金属盐即可调整水泥浆体表面张力,改善浆体流变性;当萘系减水剂掺量较大时,较高掺量的碱金属盐才可调整水泥浆体表面张力,改善浆体流变性.碱金属盐掺量过高时,水泥浆体流变性下降,表观黏度增加.碱金属硫酸盐除了存在碱金属离子对萘系减水剂双电层的压缩和破坏作用,还存在硫酸根离子对萘系减水剂的竞争吸附作用,因而使萘系减水剂在水泥颗粒表面的平衡吸附量下降程度更大.
By adjusting the concentration of Na2SO4, K2SO4, Na2CO3 and K2CO3 solution to change the concentration of soluble alkali cement slurry to study the impact of soluble alkali naphthalene superplasticizer adsorption - dispersion of the results showed that: alkali metal salts of naphthalene superplasticizer dispersed There is the best range of the amount of sexual influence, this range of dosage and naphthalene superplasticizer dosage and types of alkali metal salts associated with when the naphthalene superplasticizer dosage is small, the lower amount of alkali metal salt that The surface tension of cement paste can be adjusted to improve the rheology of the paste. When the content of naphthalene superplasticizer is larger, the higher content of alkali metal salt can adjust the surface tension of cement paste and improve the rheology of the paste. When the content of metal salt is too high, the rheology of cement paste decreases, and the apparent viscosity increases.Alginate sulfates not only have the effect of compressing and destroying the electric double layer of naphthalene superplasticizer by alkali ions, but also exist the sulfate ion pairs Naphthalene superplasticizer competitive adsorption, thus making naphthalene superplasticizer in the equilibrium adsorption of cement particles on the surface to a greater extent.