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研究了掺萘系高效减水剂浆体中同时掺入葡萄糖酸钠时,对水泥浆体流动性和流动性损失的影响。适量的葡萄糖酸钠可显著提高浆体初始流动度,并降低流动度损失。采用紫外分光光度计、zeta电位仪、X衍射仪和扫描电子显微镜测试了浆体对萘系高效减水剂的吸附量、水泥颗粒表面电位、水化产物钙矾石X衍射峰值强度和微观形貌。结果表明:在同等萘系高效减水剂掺量下,葡萄糖酸钠延缓了钙矾石的生成,并与萘系减水剂在水泥颗粒表面形成竞争吸附,导致了水化过程中萘系高效减水剂消耗量的降低,增加了高效减水剂在水泥颗粒表面的有效吸附量。
The effect of adding sodium gluconate into the slurry of naphthalene-added superplasticizer on the fluidity and fluidity loss of cement paste was studied. Appropriate amount of sodium gluconate can significantly increase the initial fluidity of slurry and reduce the loss of fluidity. The adsorption amount of naphthalene superplasticizer, the surface potential of cement particles, the X - ray diffraction peak intensity of hydrate ettringite and the microstructure of hydrous product were investigated by UV spectrophotometer, zeta potentiometer, X - ray diffraction and scanning electron microscopy. appearance. The results showed that sodium gluconate delayed the formation of ettringite at the same dosage of naphthalene superplasticizer and competed with naphthalene superplasticizer to form competitive adsorption on the surface of cement particles, resulting in high efficiency of naphthalene hydration Water reducer consumption decreased, increasing the effective superplasticizer surface adsorption of cement particles.