| 碳酸钙晶须增强高强水泥砂浆的力学性能(英文) |
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| 引用本文： | 张聪,曹明莉.碳酸钙晶须增强高强水泥砂浆的力学性能(英文)[J].东南大学学报,2012(3):331-336. |
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| 作者姓名： | 张聪 曹明莉 |
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| 作者单位： | 大连理工大学建设工程学部 |
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| 基金项目： | The National Natural Science Foundation of China (No.51102035) |
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| 摘 要： | 为改善高强砂浆的脆性,将碳酸钙晶须引入高强砂浆中以实现增强与增韧的目的.研究了抗压强度、抗折强度、劈拉强度以及断裂功等基本力学性能,采用扫描电子显微镜观察材料的微观结构和微观力学行为,讨论了碳酸钙晶须增强增韧高强水泥砂浆的机理和效率.研究表明:碳酸钙晶须的引入对高强砂浆的力学性能产生了较为积极的影响;碳酸钙晶须增强增韧高强砂浆的机理为晶须-水泥石脱黏、晶须剥离、晶须冲断以及裂纹桥联;裂纹偏转机制是比较高效的一种增强增韧机制,但并不容易在高强水泥砂浆基质中出现.研究认为,晶须与水泥砂浆基质间的界面黏结强度应该适当弱一些,这样有利于通过引入更多的裂纹偏转来增强增韧水泥砂浆复合材料.
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| 关 键 词： | 高强砂浆 碳酸钙晶须 增强 增韧 |
Mechanical properties of calcium carbonate whisker-reinforced high-strength cement mortar |
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| Zhang Cong Cao Mingli.Mechanical properties of calcium carbonate whisker-reinforced high-strength cement mortar[J].Journal of Southeast University(English Edition),2012(3):331-336. |
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| Authors: | Zhang Cong Cao Mingli |
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| Institution: | Zhang Cong Cao Mingli(Faculty of Infrastructure Engineering,Dalian University of Technology,Dalian 116024,China) |
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| Abstract: | In order to improve the brittleness of high-strength cement mortar,calcium carbonate(CaCO3) whiskers are incorporated to strengthen and toughen the high-strength cement mortar.The compressive strength,flexural strength,split tensile strength and work of fracture are measured.Microstructures and micromechanical behaviors are investigated using scanning electron microscopy.The strengthening and toughening mechanisms and the efficiency of whisker-reinforced high-strength cement mortar are discussed.The results show that the addition of CaCO3 whiskers brings positive effects on the high-strength cement mortar.The strengthening and toughening mechanisms are whisker-cement coalition debonding,whisker peeling,whisker impact breakage and whisker bridging.Crack deflection is one efficient mechanism,but it is hard to be achieved in high-strength cement mortar.And the interfacial bonding strength between whiskers and the cement mortar matrix should be appropriately weak to introduce more crack deflection mechanisms to strengthen and toughen the cement mortar efficiently. |
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| Keywords: | high-strength mortar CaCO3 whisker strengthen-ing toughening |
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