减水剂对水镁石纤维的松解作用研究

研究了綦磺酸盐、氨基磺酸盐、密胺树脂及酯基磺酸盐4种混凝土减水剂对两个级别水镁石纤维的叩解度、粘度及zeta电位的影响。通过SEM观察及混凝土强度试验，验证了减水剂对水铁石纤维的松解作用。结果表明，不同类型的减水剂对水镁石纤维的叩解度、粘度及zeta电位有不同的影响。在不同减水剂的水分散纤维悬浮液中，水镁石纤维表面均呈现负电性，随减水剂用量增加，纤维表面的负电荷增加。长等级纤维的叩解度高于短纤维，悬浮液粘度也高于短纤维。在纤维用量不变的情况下，随减水剂用量及纤维叩解度的增加，混凝土抗折强度提高，然后趋于饱和。在减水剂的作用下，纤维直径由微米级下降至纳米级。

Dispersing Effects of Superplasticizer to Brucite Fibers

Effects of four types of superplastieizer to the beating degrees, viscosities and ZETA petentials of two grades of brucite fibers were investigated. Dispersing effects of superplasticizer to brucite fibers were verified by means of SEM observation and concrete strength tests. The results indicate that different types of superplasticizer have different effects on the beating degrees, viscosities and ZETA potentials of brucite fibers. The surface of brucite fibers displays negative charge characteristics in superplasticizer suspensions and becomes more negative when the concentration of superplasticizer increases. Long grade brucite fibers have a higher beating degree and denser viscosity than the short ones. Under the condition of invariable fiber dosage, the flexural strength of concrete moves upward with the increase of water reducer dosage and fiber beating degrees, and then approaches to saturation. The diameter of brucite fiber changes from micromete, scales to nanometer dimension with the dispersing action of water reducers.