摘要
为有效利用砒砂岩资源,通过简单加工降低治理成本,获得利用价值,在红色砒砂岩中加入不同掺量的硅酸盐水泥制成砒砂岩水泥土,在不同龄期下进行干湿循环、无侧限抗压强度试验和超景深微观结构观测.结果表明:掺量仅为5%砒砂岩水泥土就可以有效改善砒砂岩遇水溃散的特性;干湿循环5次砒砂岩水泥土抗压强度达到最大,然后趋于平缓,可见干湿循环对无掺水泥砒砂岩有破坏作用,对砒砂岩水泥土却提供了有效养护;不论是早期还是后期,掺量为5%的抗压强度最低,然后逐渐增加,掺量20%及以上的强度几乎相等且最大,可见水泥最优掺量为20%;通过微观结构观察,随着龄期的增加,掺量小的砒砂岩水泥土表面凹凸起伏程度大、孔洞多,最优掺量为20%的砒砂岩水泥土结构整体性紧密,表面平整、孔洞少,密实性更好,且抗压强度可以满足砖和砌块的强度要求.
In order to solve the problem of breaking loose and reducing strength of Pisha-sandstone in case of water,through simple processing to achieve the effective use of the Pisha-sandstone and reduce the cost of governance,and adding different amounts of silicate cement in red Pisha-sandstone to form Pisha-sandstone cement soil,experiment on wetting-drying cycle,unconfined compressive strength and microstructure observation of hyperdepth at different ages of Pisha-sandstone cement soil were carried out. The results show that: only 5% dosage Pisha-sandstone cement soil can effectively improve the Pisha-sandstone water collapsibility. The 5-times wetting-drying cycle Pisha-sandstone cement soil reaches the maximum compressive strength,then it tends to be gentle. The wetting-drying cycle has da-maging effects on non-cement Pisha-sandstone. It provides effective curing for Pisha-sandstone cement soil. Whether at early strength or at late strength,the compressive strength of 5% is the lowest and then gradually increases. The strength of 20% and above is almost equal and maximum. It can be seen that the optimal cement content is 20%. By observing the microstructure,feldsparthic Pishasandstone cement soil with the increase of age and small admixture has uneven surface fluctuation and more holes. The feldsparthic Pisha-sandstone cement soil structure of the aptimas dosage of 20% is wholly close and smooth on the surface,with less holes and better compactness. Its compressive strength can reach the strength requirement of bricks and blocks.
作者
邬尚贇
李晓丽
常平
张赢
郭雒敏
WU Shangyun;LI Xiaoli;CHANG Ping;ZHANG Ying;GUO Luomin(College of Water Conservancy and Civil Engineering,Inner Mongolia Agricultural University,Hohhot,Inner Morgolia 010018,China)
出处
《排灌机械工程学报》
EI
CSCD
北大核心
2019年第12期1093-1099,共7页
Journal of Drainage and Irrigation Machinery Engineering
基金
国家自然科学基金资助项目(41561061)
关键词
砒砂岩水泥土
干湿循环
抗压强度
微观结构
力学性能
Pisha-sandstone cement soil
wetting-drying cycle
compressive strength
microstructure
mechanical property
