氧化改性木素磺酸钙的制备及其对水泥净浆的影响

摘要

Calcium lignosulphonate(CL)was oxidation modified by hydrogen peroxide,and orthogonal test was carried out to study the best modifiecation conditions.The modified calcium lignosulphonate (MCL) was characterized by FT-IR and SEM,and the influences of CL,MCL on paste and hydration products of cement were studied.The results showed that,MCL had a good adsorption capacity,and the fluidity of cement paste adding 0.6％ MCL was increased by 67％ compared with the paste adding 0.6％ CL.The XRD test results indicated that,both CL and MCL restrained cement to create Ca(OH)2,but the sertraining effect of MCL became weaker,to some extent,weakened its function of delaying cogulation of cement parte.%采用H2O2对木素磺酸钙进行氧化改性处理,通过正交实验确定最佳改性条件,再对改性产物进行红外光谱(FT-IR)分析和扫描电子显微镜(SEM)表征,并对比了改性前后木素磺酸钙对水泥净浆流动度和水泥早期水化产物的影响.结果表明,改性后的木素磺酸钙吸附能力大大增强,当在水泥净浆中掺加0.6％的改性木素磺酸钙后,水泥净浆流动度提高了67％.X射线衍射仪(XRD)的测试结果表明,改性前后木素磺酸钙均会抑制Ca(OH)2的生成,但改性后抑制效果减弱,一定程度上减弱了木素磺酸钙对水泥的缓凝作用.