| 摘要: |
| 针对海水拌和珊瑚礁砂混凝土与普通河砂混凝土力学性能的差异开展研究，并对其微观结构进行分析.结果表明：相比普通河砂，珊瑚礁砂结构疏松多孔、多棱角、脆性较大；用海水拌和的珊瑚礁砂混凝土早期抗压强度发展较快而后期抗压强度增长速率相对普通河砂混凝土缓慢，其弹性模量低于普通河砂混凝土，抗折强度和劈裂抗拉强度与普通河砂混凝土无显著差异；海水拌和珊瑚礁砂混凝土与普通河砂混凝土水化产物类型相同，水化产物与珊瑚礁砂表面孔隙结合紧密. |
| 关键词: 混凝土 珊瑚礁砂 海水 力学性能 微观结构 |
| DOI：103969/j.issn.1007 9629201801007 |
| 分类号: |
| 基金项目:国家重点研发计划（2016YFC0305100）；全军后勤科研计划 |
|
| Mechanical Properties and Microstructure of Concrete Prepared with Coral Reef Sand and Sea Water |
|
GUO Dong1, SU Chunyi2, PENG Ziqiang3, LI Qiu4, CHEN Wei4
|
|
1.Naval Institute of Engineering Design and Research, PLA, Beijing 100070, China;2.School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China;3.Design & Research Institute, Wuhan University of Technology, Wuhan 430070, China;4.State Key Laboratory of Silicate Materials for Architecture, Wuhan University of Technology, Wuhan 430070, China
|
| Abstract: |
| Based on the difference between the mechanical properties of coral reef sand and ordinary river sand, the mechanical properties and microstructure of concrete prepared with the two types of sand were investigated. The experimental results show that, coral reef sand exhibits loose structure with open pores, multi edges and fragile. Compared to the ordinary river sand concrete, the compressive strength of coral reef sand concrete mixing with sea water develops rapidly, but the growth rate is relatively lower. The elastic modulus is lower than that of the ordinary river sand concrete. The flexural strength and splitting tensile strength of concrete are almost the same as those of the ordinary river sand concrete. The hydration products of coral reef sand concrete and ordinary river sand concrete mixing with sea water are similar. The hydration products and the pore surface of coral reef sand are tightly combined. |
| Key words: concrete coral reef sand sea water mechanical property microstructure |
