Analysis of Influencing Factors and Mechanism of Strength of Cement-Modified Silty Sand

Weidong Jin,Chenyang Liu,Zhe Wang,Yongming Ai,Xudong Zhang

doi:10.1155/2021/9414234

Abstract

The unconfined compressive strength of cement-modified silty sand in Jilin Province was investigated in this study. For this purpose, various tests were conducted, including the screening test, compaction test, CBR test, X-ray fluorescence detection, and unconfined compressive strength test. Effects of compaction degree, soil quality, water quality, cement content, and curing age were considered. The results show that CBR value is positively correlated with compactness. Two kinds of different water qualities have little effect on unconfined compressive strength of cement-improved soil; with the increase in cement content, the unconfined compressive strength increases, and the power function equation established by the two is significantly correlated. The logarithmic relationship between cement-soil strength and curing age is approximately linear. Through regression analysis, the comprehensive characterization parameters of cement-soil strength, such as water-cement ratio, cement content, and curing age, are put forward. The unconfined compressive strength of cement-modified silty sand has a good power function relationship with the comprehensive characterization parameters, and the fitting degree between the strength prediction formula and the existing research and test data exceeds 90%, which verifies the effectiveness of the comprehensive characterization parameters.

Highlights

In order to prevent roadbed diseases and improve roadbed strength, many scholars propose to use cement, lime, fiber, slag, and other materials to reinforce and improve roadbed soil [1, 2]
Through the unconfined compressive strength test of cement-modified soil, the influence law of different soil samples, cement content, curing age, watercement ratio, and other parameters on the strength of cement-modified soil are analyzed, and the strength characterization parameters which are generally applicable to cement-modified soil are constructed to comprehensively reflect the change law of the influence of various influencing factors on the strength, and the empirical formula of strength prediction is established, so as to provide a theoretical basis and practical reference for the application and popularization of the cement-improved soil subgrade in seasonal frozen areas
Test soil samples are taken from different silty sand borrow yards along Shuangtao Expressway

Summary

Introduction

In order to prevent roadbed diseases and improve roadbed strength, many scholars propose to use cement, lime, fiber, slag, and other materials to reinforce and improve roadbed soil [1, 2]. Through the unconfined compressive strength test of cement-modified soil, the influence law of different soil samples, cement content, curing age, watercement ratio, and other parameters on the strength of cement-modified soil are analyzed, and the strength characterization parameters which are generally applicable to cement-modified soil are constructed to comprehensively reflect the change law of the influence of various influencing factors on the strength, and the empirical formula of strength prediction is established, so as to provide a theoretical basis and practical reference for the application and popularization of the cement-improved soil subgrade in seasonal frozen areas

Materials and Methods

Experiment Method

Results and Discussion

Conclusions