水泥改良张家口坝上风积沙的力学性能研究

Study on the Mechanical Properties of Cement-improved Aeolian Sand in Zhangjiakou Dam Area

为了改良张家口坝上地区的风积沙使其达到公路路基的要求,通过室内试验研究了水泥改良风积沙的力学性能,通过控制变量法研究了水泥掺量和压实度以及养护龄期对于改良风积沙的无侧限抗压强度的影响,由本次试验得出以下结论:改良风积沙的强度性能随着固化剂的掺量的增加而增大,但是增长的速率逐渐减慢;改良风积沙的强度性能随着混合料的压实度的增加而增大,但是其增长的速率减慢,混合料的压实度达到95%,力学性能基本稳定;改良风积沙的强度性能随着养护时间的增加而增大,但是强度增长的速率减慢,养护21天,试件的强度基本稳定。

In order to improve the aeolian sand in the dam area of Zhangjiakou to meet the requirements of highway roadbeds,the mechanical properties of cement-improved aeolian sand are studied through laboratory experiments.The impact of cement content,compactness and curing age period on the unconfined compressive strength of the improved aeolian sand is studied by the method of controlled variables.The following conclusions are drawn from this test.The strength performance of the improved aeolian sand increases with the increase in the amount of curing agent,but the rate of increase gradually slows down;the strength performance of the improved aeolian sand increases with the increase in the compaction of the mixture,but its growth rate slows down;when the compaction of the mixture reaches 95%,the mechanical properties are basically stable;The strength performance of the improved aeolian sand increases with the increase of curing time,but the rate of strength growth slows down.After 21 days’curing,the strength of the specimen is basically stable.