论文部分内容阅读
应用超滤分级方法，将木素磺酸钙分成不同分子量范围的级分。研究了各级分的表面物化性能，结果表明，高分子量的级分比低分子量具有更高的表面活性和起泡性能；且高分子量级分在固液界面上的饱和吸附量基本不受分子量大小的影响，而低分子量级分的饱和吸附量随分子量的增大而增加。进一步研究了各级分对水泥、混凝土性能的影响，发现当木素磺酸钙掺量高于０５％时，其分散作用随着分子量的增大而增强。随着木素磺酸钙分子量的增大，掺木素磺酸钙的水泥净浆流动度损失逐渐减少，而混凝土的含气量增大，抗压强度降低。
Using ultrafiltration classification method, calcium lignosulfonate was divided into fractions of different molecular weight ranges. The surface physicochemical properties of various fractions were studied. The results show that the high molecular weight fractions have higher surface activity and foaming properties than the low molecular weight fractions; and the saturated molecular weight fractions of the high molecular weight fractions at the solid-liquid interface are not substantially affected by the molecular weight. The effect of size, while the saturated adsorption of the low molecular weight fraction increases with increasing molecular weight. The influence of different grades on the performance of cement and concrete was further studied. It was found that when the calcium lignosulfonate content was higher than 0.5%, the dispersion increased with the increase of the molecular weight. With the increase of the molecular weight of calcium lignosulfonate, the loss of cement paste fluidity with calcium lignosulphonate gradually decreased, while the gas content of concrete increased, and the compressive strength decreased.