CaCl2复合活化黄河泥沙的作用效果与机理

Interaction Effect and Mechanism of CaCl2 and Complex Activator with the Yellow River Sediment

关键词:  黄河泥沙  活化  生土砌块  活化机理

Key words:  the Yellow River sediment  activation  soil block  activation mechanism

摘要:

通过黄河泥沙的活性指数（PAI）和活性率(K)以及黄河泥沙基生土砌块的抗压强度和软化系数，来评价CaCl2，CaCl2与水玻璃复合激发剂对黄河泥沙的活化效果，并通过FTIR和XRD分析了CaCl2的活化机理.结果表明：CaCl2与水玻璃质量比为1∶1的复合激发剂能够明显改善黄河泥沙的反应活性，其用量为6%（质量分数）时，胶砂试件的活性指数达到063；CaCl2通过Ca2+与黏粒中Na+的离子交换作用，加速黏土矿物的水解并释放出硅铝离子，从而提高黄河泥沙的反应活性，改善黄河泥沙基生土砌块的力学性能.

Abstract:

Interaction effect of CaCl2 and complex activator（composed of CaCl2 and sodium silicate glass） on the Yellow River sediment was investigated in terms of parameters, such as pozzolanic activity index（PAI） of sediment mortars, activity ratio（K） of activated sediment, compressive strength and softening coefficient of sediment based soil blocks. Activation mechanism can be elucidated by FTIR and XRD analysis of sediment before and after activated. Results show that the reaction activity of sediment is significantly improved by complex activator when the mass ratio of CaCl2 and sodium silicate glass is 1∶1. PAI of activated sediment reaches 063 when the content（by mass） of complex activator is 6%. CaCl2 promotes the release of soluble Si4+ and Al3+ by ion exchange of Ca2+ with Na+. Thus，the reaction activity of the Yellow River sediment and the mechanical properties of sediment based soil blocks will be improved.