K+与PVA协同作用对膨胀土水化膨胀的抑制作用
Synergistic reaction of K+ and pllyvinyl alcohol on restraing swelling and hydrating behavior of expansive soil
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摘要: 从晶层膨胀与渗透膨胀的微观角度分析了膨胀土的水化膨胀机理,在此基础上提出了以抑制水化膨胀和减少环境负担为目的的K+与聚乙烯醇(PVA)合成剂。通过自由膨胀率试验、颗分试验与水化崩解试验证实K+与PVA能产生协同抑制作用,可有效降低膨胀土的自由膨胀率、改善其粒度成分并提高其水稳性,而0.6%的PVA溶液与7%KCl溶液组合被认为是一种经济合理的配比选择。Abstract: K+ and pllyvinyl alcohol were choosen as the inhibition reagent on the hydrating and swelling behavior of expansive soil on the basis of the studies on crystalline swelling and osmosis swelling.Synergistic reaction of K+ and pllyvinyl alcohol which were thought friendly to the environment was proved by a series of tests.It would reduce the free swelling ratio,improve the granularity ingredient and enhance the stability in water.The composition of KCI solution of 7% with pllyvinyl alcohol of 0.6% was regarded as a reasonable proportion.
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