EFFECTS OF MOLECULAR STRUCTURE OF POLYCARBOXYLATE POLYMERS ON CEMENT PARTICLE DISPERSIBILITY
EFFECTS OF MOLECULAR STRUCTURE OF POLYCARBOXYLATE POLYMERS ON CEMENT PARTICLE DISPERSIBILITY
复制标题
聚羧酸盐聚合物分子结构对水泥颗粒分散性的影响
DOI：
10.2208/jscej.2000.662_17
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
H. Okamura
中科院分区：
文献类型：
--
作者：
T. Sugamata;M. Hibino;M. Ouchi;H. Okamura
在延长混合时间的条件下，考察了含有不同分子结构的聚羧酸盐聚合物的各种超增塑剂（SP）的颗粒分散效果。 SP的颗粒分散效果，用砂浆的相对流动面积比与砂浆的相对漏斗速度比的比值来表示，随着SP用量的增加而呈直线增加。尽管取决于 SP 的分子结构，但水泥颗粒上的表观吸附几乎不随剂量的增加而增加；换句话说，仅残留在液相中的量增加。由于混合而导致的 SP 颗粒分散效果的降低可分为两个部分：1）当 SP 用量减少时，与残留在液相中的量相对应的降低； 2) 考虑到液相中剩余量的减少，颗粒分散效果的下降幅度比预期更大。造成这种行为的主要因素是 SP 的分子结构及其对 SP 在水泥颗粒上的吸附率的影响。
The particle-dispersing effect of various superplasticizers (SP) containing polycarboxylate polymers with different molecular structures is examined under conditions of extended mixing time. The particle-dispersing effect of an SP, represented by the ratio of the relative flow area ratio of the mortar to the relative funnel speed ratio of the mortar, increases in a straight line as the dosage of SP increases. Although dependent on the molecular structure of the SP the apparent adsorption onto cement particles scarcely increase as dosage is increased; in other words, only the amount remaining in the liquid phase increases. The decrease in particle-dispersing effect of an SP as a result of mixing can be divided into two contributions: 1) a decrease corresponding to the amount remaining in the liquid phase when the dosage of SP is reduced; and 2) a larger decrease in particle-dispersing effect than expected given the decrease in the amount remaining in the liquid phase. The main factor reponsible for this behavior is the molecular structure of the SP and its effect on the adsorption rate of the SP onto the cement particles.