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通过氧化、磺甲基化改性造纸黑液制取木质素磺酸钠(SLS),磺化度为1.023 7 mmol/L,重均相对分子质量(M_w)为26 320;将SLS与聚羧酸高效减水剂(PCE)按一定比例复配制备复合减水剂,SLS质量分数为10%、20%、30%和40%时,分别制得复合减水剂BPCE1~BPCE4。复合减水剂对水泥颗粒表面吸附层厚度和水泥浆Zeta电位分析表明:吸附层厚度随SLS质量分数增加而增加,水泥浆Zeta电位在SLS质量分数为20%时显示出绝对值最大。采用复配木质素磺酸钠的复合聚羧酸减水剂制备混凝土,复合减水剂掺量0.18%、SLS总掺量1%。通过净浆流动度、胶砂流动度、泌水率、减水率、混凝土抗压强度等指标对复合减水剂进行综合性能分析。结果表明:含20%SLS的复合聚羧酸减水剂BPCE2减水剂综合性能最佳。
The sulfonation degree was 1.023 7 mmol / L and the weight average molecular weight (M_w) was 26 320 by oxidation and sulfomethylation modified papermaking black liquor. SLS and polycarboxylate The composite superplasticizer BPCE1 ~ BPCE4 was prepared when the content of SLS was 10%, 20%, 30% and 40%, respectively, according to a certain proportion of acid superplasticizer (PCE). The results show that the thickness of adsorption layer increases with the increase of SLS mass fraction, and Zeta potential of cement slurry shows the largest absolute value when SLS mass fraction is 20%. The composite polycarboxylate superplasticizer with compound sodium lignosulphonate was used to prepare concrete. The content of composite superplasticizer was 0.18% and the total content of SLS was 1%. Through the fluidity of paste, mortar fluidity, bleeding rate, water reduction rate, compressive strength of concrete and other indicators of composite superplasticizer performance analysis. The results show that the composite of polycarboxylate superplasticizer BPCE2 with 20% SLS has the best comprehensive performance.