工程地质学报2019，Vol.27Issue(1)：80-87,8.DOI:10.13544/j.cnki.jeg.2019-012
硅酸钠改良水泥基稳定磷石膏在路面基层中的试验研究
EXPERIMENTAL STUDY ON CEMENT-BASED STABILIZED PHOSPHOGYPSUM MODIFIED BY SODIUM SILICATE IN PAVEMENT BASE
摘要
Abstract
Phosphogypsum is a solid waste material. The storage of phosphogypsum wastes a lot of land resources and seriously pollutes the soil and water environment. And it may cause landslides. Therefore, it is extremely urgent to utilize phosphogypsum resources. In this paper we researched the cement-based stabilized phosphogypsum modified by sodium silicate to use in pavement base. Through unconfined compressive strength test, water stability test, dry shrinkage test and scanning electron microscope test, we obtained the physical and mechanical properties of cement-based stabilized phosphogypsum modified by sodium silicate using different dosage, incorporation mode and curing age. Sodium silicate promotes the hydration of cement and produces calcium silicate hydrate. It reveals the improvement mechanism of the strength of the mixture. The experimental results show that the compressive strength, water stability, water loss rate and dry shrinkage strain of cement-based stabilized phosphogypsum mixture can be effectively improved when the content of sodium silicate dissolved in water is 2％～ 4％. It is suggested that within 4-5 days after the construction of thepavement base, it is the best time to effectively control the water loss and dry shrinkage of the pavement base, so as to avoid the occurrence of cracks caused by rapid water loss.关键词
磷石膏/硅酸钠/水泥/路面基层/干缩变形Key words
Phosphogypsum/Sodium silicate/Cement/Pavement base/Dry shrinkage deformation分类
建筑与水利引用本文复制引用
李志清,沈鑫..硅酸钠改良水泥基稳定磷石膏在路面基层中的试验研究[J].工程地质学报,2019,27(1):80-87,8.基金项目
中国科学院青年创新促进会 (2017092) （2017092）
国家自然科学基金 (41672316) （41672316）
云南省科技计划 (2017ZE020) 资助 （2017ZE020）
