摘要
利用固化剂与水泥对素土进行固化处理,既可以充分利用工程弃土,降低砂石料成本,又可以减少水泥使用,保护生态环境。通过无侧限抗压强度试验、劈裂抗拉强度试验和扫描电镜试验,研究了固化水泥土的力学性能和微观特性。力学试验显示:养护龄期的延长、水泥掺量的增加以及固化剂的掺入均能增强固化水泥土的无侧限抗压强度与劈裂抗拉强度;0.04%固化剂、10%水泥掺量下的试件强度高于未掺入固化剂时10%水泥掺量下的试件强度,且与未掺入固化剂时12%水泥掺量下的试件强度极为接近。微观试验显示:28 d龄期下,固化剂的掺入和水泥掺量的增加,增强了水化反应的进行,水化产物增加,试件的面孔隙度和孔隙直径下降。结果表明,固化水泥土的路用性能优于水泥土,满足道路工程需求。
The use of curing additives and the cement to solidify the plain soil can make the full use of the abandoned soil of the project,reduce the cost of sand and gravel,reduce the use of cement and protect the ecological environment.The unconfined compressive strength test,splitting tensile strength test,and scanning electron microscope test were utilized to investigate the mechanical properties and the microscopic features of soil-cement after the solidification.The mechanical test shows that the unconfined compressive strength and the splitting tensile strength of the solidified soil-cement can be enhanced by the extension of curing age,the increase of cement content and the addition of curing agent.The specimen containing O.04%curing agent and 10%cement content exhibits greater strength compared to the specimen without curing agent but with 10%cement content and is nearly equivalent to the strength of the specimen without curing agent but with 12%cement content.The microscopic examination reveals that the introduction of a curing agent and an increase in cement content result in improved hydration reac-tion,elevated levels of hydration products,as well as reduced surface porosity and pore diameter of the sample at 28 days old.The results show that the road performance of solidified soil-cement is better than that of soil-cement,which meets the needs of road engineering.
作者
殷文豪
张建彪
王小龙
陈哲
YIN Wenhao;ZHANG Jianbiao;WANG Xiaolong;CHEN Zhe(School of Transportation Engineering,Shandong Jianzhu University,Jinan 25010l;Shandong Road and Bridge Group Co.Ltd,Jinan 250014)
出处
《土工基础》
2024年第3期530-534,共5页
Soil Engineering and Foundation
关键词
固化剂
水泥土
无侧限抗压强度
劈裂抗拉强度
微观特性
Curing Additives
Soil-Cement
Unconfined Compressive Strength
Splitting Tensile Strength
Microscopic Char-acteristics
