|Table of Contents|

[1] Zhang Cong, Cao Mingli,. Mechanical properties of calcium carbonatewhisker-reinforced high-strength cement mortar [J]. Journal of Southeast University (English Edition), 2012, 28 (3): 331-336. [doi:10.3969/j.issn.1003-7985.2012.03.014]
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Mechanical properties of calcium carbonatewhisker-reinforced high-strength cement mortar()
碳酸钙晶须增强高强水泥砂浆的力学性能

Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:
28
Issue:
2012 3
Page:
331-336
Research Field:
Chemistry and Chemical Engineering
Publishing date:
2012-09-30

Info

Title:
Mechanical properties of calcium carbonatewhisker-reinforced high-strength cement mortar
碳酸钙晶须增强高强水泥砂浆的力学性能
Author(s):
Zhang Cong, Cao Mingli
Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian 116024, China
张聪, 曹明莉
大连理工大学建设工程学部, 大连 116024
Keywords:
high-strength mortar;  CaCO3 whisker;  strengthen-ing;  toughening
高强砂浆;  碳酸钙晶须;  增强;  增韧
PACS:
TQ172
DOI:
10.3969/j.issn.1003-7985.2012.03.014
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.
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.

References:

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Memo

Memo:
Biographies: Zhang Cong(1988—), male, graduate;Cao Mingli(corresponding author), female, doctor, associate professor, caomingli3502@163.com.
Foundation item: The National Natural Science Foundation of China(No.51102035).
Citation: Zhang Cong, Cao Mingli. Mechanical properties of calcium carbonate whisker-reinforced high-strength cement mortar[J].Journal of Southeast University(English Edition), 2012, 28(3):331-336.[doi:10.3969/j.issn.1003-7985.2012.03.014]
Last Update: 2012-09-20