Research on the solidification and improvement performance of weathered argillaceous siltstone subgrade
This article uses cement,fly ash,slag,lime,calcium based bentonite,and hydroxypropyl methylcellulose(HPMC)as curing agents to improve and solidify the weathered argillaceous siltstone.The results show that:When the raw material ratio of the curing agent is 34.8％、15.0％、30.0％、15.0％、5.0％、0.2％,the amount of curing agent used is 5％of weathered siltstone,and the amount of water added is 1.9 times that of weathered siltstone,the engineering properties of the weathered siltstone after solidifica-tion reach their optimal level.The 7-d unconfined compressive strength,7-d saturated unconfined compressive strength,and water stability coefficient of the solidified specimens are reached 1.68 MPa,1.55 MPa,and 92.26％,respectively,meeting the requirements of the highway subgrade design specifications.The hydration mechanism of inorganic cementitious materials in the curing agent,the cementitious mechanism of organic polymers,the mechanism of changing the electromotive potential,and the synergistic effect gener-ated by the interaction between each component jointly promote the significant improvement of the water stability,strength,and over-all integrity of weathered argillaceous siltstone.Compared with the original construction plan,the total construction cost of this re-search plan can be reduced by about 20％.
万方数据
维普
