| Abstract: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． |
