水泥稳定三峡库区风化砂CBR值试验研究

以宜昌市三峡库区风化砂为研究对象，采用水泥对其进行稳定改良，拟用作公路路面基层。在风化砂中分别掺入3%，5%，7%，9%的水泥，在标准养护条件下，分别养护了7，14，21，28 d，然后进行加州承载比(CBR)值试验。试验结果表明水泥可以有效提高风化砂的CBR值，且水泥掺量和养护龄期均对风化砂的CBR值有很大影响;在养护龄期一定时，水泥稳定风化砂的CBR值随水泥掺量的增加逐渐增大，CBR值与水泥掺量之间呈良好的对数关系;在相同的水泥掺量下，水泥稳定风化砂的CBR值随养护龄期的增长稳步提高，CBR值与养护龄期之间基本呈线性关系。综合考虑经济性和风化砂的力学特性，风化砂中掺入7%的水泥能使CBR值达到最大值。

Experimental Study on CBR Value of Cement-treated Weathered Sand of the Three Gorges Reservoir

The weathered sand from the Three Gorges Reservoir in Yichang city was stabilized by cement and was used for highway pavement base.Weathered sand was mixed with 3%,5%,7%,9%cement,respectively,and maintained for 7 days,14 days,21 days,and 28 days under standard curing condition,and then test on the Califor-nia bearing ratio(CBR)value of the treated weathered sand was carried out.Experimental result shows that cement can effectively improve the CBR value of weathered sand,and cement content and curing age both have great influ-ence on the CBR values of weathered sand.Under the same curing age,the CBR value of cement-treated weathered sand increases with the growth of cement dosage gradually.CBR value and cement dosage shows good logarithmic relation.Under the same dosage of cement,the CBR value of cement-treated weathered sand increases with the growth of curing age steadily,and the relationship between CBR value and curing age is linear.In comprehensive consideration of economy and mechanical properties of weathered sand,adding 7% cement could maximize the CBR value.