水泥珊瑚砂砂浆抗压强度与微观结构
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桂林理工大学南宁分校

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TQ175

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国家自然科学基金项目(面上项目,重点项目,重大项目)(51568016)和广西岩土力学与工程重点实验室资助课题(16-B-01)资助,


Research on compressive strength and microstructure of coral sand cement mortar
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Guilin University of Technology at Nanning

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    摘要:

    珊瑚砂是一种以生物骨骼、贝壳碎片和珊瑚碎片等有机物为主的特殊砂土,采用珊瑚砂和河砂制备水泥砂浆的性质有大差别,针对这一问题,取南海某岛礁的珊瑚砂制备水泥砂浆,考虑不同砂灰比和不同养护龄期等因素进行压缩试验,并对其中部分试样进行电镜扫描,试验结果表明:水泥珊瑚砂砂浆的抗压强度随着砂灰比的增大而非线性减小;砂灰比低的珊瑚砂水泥砂浆抗压强度随着龄期增长的幅度较大;养护初期,水泥珊瑚砂浆的抗压强度相对较高,但随着养护时间的增长,其抗压强度低于河沙制成的水泥砂浆的抗压强度;珊瑚砂砂浆中的锯齿楔形结构可提高承压作用,但其中的孔洞和其易碎特征阻碍水泥石结构形成完整联络体,进而降低了珊瑚砂砂浆的抗压强度。

    Abstract:

    Coral sand, a kind of special soil, which mainly consists of biological bone fragments, shells and corals, has a great difference from the terrigenous sand in properties of making cement mortar. In order to solve this problem, the coral sand from the South China Sea was used for making cement mortar to conduct a compressive test, which considered the factors such as different mix proportion and different curing period. And, some of the specimens were scanned electron microscope test. The test results show that: the compressive strength of coral sand cement declines nonlinearly with the climbing aggregate-to-cement ratio; the compressive strength of cement mortar with low ratio of coral sand increases relativelySlargely with curing time developing; at the early period of curing, the compressive strength of cement coral mortar is relatively higher than that of cement mortar made of river sand, but it is lower than that as the curing time increasing; the wedge-shaped structure in coral sand cement mortar can improve the compressive strength of the cement mortar, however, holes inside coral sand and its fragile characteristics prevent the cement stone structure from forming a complete body, thus reducing the compressive strength of coral sand mortar.

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引用本文

秦修云,赵军,刘茂军. 水泥珊瑚砂砂浆抗压强度与微观结构[J]. 科学技术与工程, 2019, 19(21): 239-244.
Qin Xiu-yun, and. Research on compressive strength and microstructure of coral sand cement mortar[J]. Science Technology and Engineering,2019,19(21):239-244.

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  • 收稿日期:2019-01-15
  • 最后修改日期:2019-04-25
  • 录用日期:2019-03-12
  • 在线发布日期: 2019-08-08
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