摘要
利用珊瑚砂取代天然河砂制备水泥稳定基层材料,系统研究了水泥稳定珊瑚砂材料在海水拌合养护、淡水拌合养护制度以及干湿循环作用下的力学性能差异,利用XRD、SEM对其微观结构和强度形成机理进行分析。结果表明,海水拌合养护水泥稳定珊瑚砂材料比淡水拌合与养护早期强度发展快,但后期强度会出现倒缩,其中5%、6%、7%、8%水泥用量90 d强度分别倒缩15%、5%、3%、1.5%,而6%水泥用量下的试件90 d强度依然满足规范要求;干湿循环作用加速了海水对水泥稳定珊瑚砂材料内部结构破坏,最终导致材料表面局部脱落、松散,使强度降低;微观结构分析表明海水拌合水泥稳定珊瑚砂材料水化产物与普通水泥石类型相同,水泥水化产物与珊瑚砂表面孔隙紧密接触,有利于增强浆体与珊瑚骨料结合强度。
With the use of coral sand instead of natural river sand to prepare cement stabilized subbase materials,the mechanical properties of cement stabilized coral sand under sea water mixing and maintenance,fresh water curing and dry and wet cycle were systematically studied.The strength formation mechanism of cement stabilized coral was analyzed by XRD and SEM.The test results show that the strength of the cement stabilized coral sand with seawater mixing and curing is faster than that of fresh water,but the later strength will shrink.The 90 d strength of 5%,6%,7%,8%cement stabilized coral sand is reduced by 15%,5%,3%and 1.5%respectively,while the 90 d strength of the specimen under 6%cement content is still satisfied with the requirements of the standard.The drying and wetting cycle accelerates the destruction of the internal structure of the cement stabilized coral sand material by the sea water,resulting in the local surface abscission and loosening of the material surface and the reduction of strength.The hydration products of the cement stabilized coral sand are the same as those of the ordinary cement.The hydration products of the cement are closely connected with the surface pores of the coral sand,which helps to enhance the bond strength of the pulp and the coral aggregate.
作者
耿九光
尚涛
陈明远
GENG Jiu-guang;SHANG Tao;CHEN Ming-yuan(School of Materials Science and Engineering,Chang'an University,Xi'an 710064,China)
出处
《硅酸盐通报》
CAS
北大核心
2019年第3期794-798,共5页
Bulletin of the Chinese Ceramic Society
基金
国家自然科学基金(51608045)
中国博士后科学基金(2015M582590)
中央高校基本科研业务费专项资金(310831173701
2014G1311087)
关键词
珊瑚砂
水泥稳定基层材料
海水
养护系统
coral sand
cement stabilized subbase material
sea water
curing system
