抵抗有机质对水泥土强度不利影响的有效方法

采用水泥搅拌桩进行地基处理时,常常因为有机质的存在,使得采用水泥搅拌法进行地基处理的效果不甚理想,这是因为有机质能够与水泥矿物发生一系列化学作用,阻碍水泥水化产物的晶体生长,从而不利于水泥加固土强度增长。针对有机质对水泥加固土强度的这种不利影响,进行了一些尝试性试验,旨在寻求一种添加剂,用来抵消有机质对强度的这种不利影响。试验结果及化学机理分析表明,纯氯化钠能够有效抵消有机质对强度的这种不利影响,可以作为一种既有效又经济实用的水泥土添加剂。

An Effective Method for Reducing Disadvantageous Effect of Organic Matter on Cement-Soil Compressive Stress

When using cement mixing pile to treat soft ground,the ground treatment effect becomes not so good because of the existence of organic matters.It is because series of chemical reactions occurs between the organic matters and cement minerals,and it restrains the growth of the cement hydrate crystals,as a result,it is disadvantageous for the increase of cement-soil compressive stress.Aiming at finding a new cement additive to reduce the disadvantageous effect of the organic matters on cemented-soil compressive stress,the series of tentative experiments are carried out.Experiment data and chemical mechanism analysis show that sodium chloride can effectively reduce this disadvantageous effect on cement-soil of the organic matters,and it can be used as a kind of effective,economical and practical cement additive.