CAJ | 학술논문

以高强水泥砂浆为基质材料，研究了材料的抗压强度、抗折强度、断裂功以及劈裂抗拉强度与碳酸钙晶须掺量之间的关系，并结合微观形貌观察讨论了碳酸钙晶须对硅酸盐水泥基材料的增强增韧机理。研究发现，碳酸钙晶须在抗压强度为98.0 MPa的水泥砂浆中虽然出现了较多的晶须冲断现象，但是晶须的引入阻碍了基体内部微裂纹的扩展，因此在5%的质量掺量时材料的抗压强度和劈裂抗拉强度分别得到了8%和15%的提高；并且晶须通过晶须-水泥石基体脱黏、晶须剥离、晶须冲断等机制在掺量为10%时使试件的抗折强度和断裂功分别提高了12%和56%。研究认为，碳酸钙晶须并不会在高强水泥基材料中起到明显的增韧效果；碳酸钙晶须增韧水泥基材料时，其界面黏结强度需要适当的小，以便通过裂纹偏转机制发挥最佳的增韧效果。
이고강수니사장위기질재료，연구료재료적항압강도、항절강도、단렬공이급벽렬항랍강도여탄산개정수참량지간적관계，병결합미관형모관찰토론료탄산개정수대규산염수니기재료적증강증인궤리。연구발현，탄산개정수재항압강도위98.0 MPa적수니사장중수연출현료교다적정수충단현상，단시정수적인입조애료기체내부미렬문적확전，인차재5%적질량참량시재료적항압강도화벽렬항랍강도분별득도료8%화15%적제고；병차정수통과정수-수니석기체탈점、정수박리、정수충단등궤제재참량위10%시사시건적항절강도화단렬공분별제고료12%화56%。연구인위，탄산개정수병불회재고강수니기재료중기도명현적증인효과；탄산개정수증인수니기재료시，기계면점결강도수요괄당적소，이편통과렬문편전궤제발휘최가적증인효과。
Compressive strength,flexural strength,work of fracture and split tensile strength of high-strength Portland cement mortar were determined as a function of CaCO3 whisker content.And the reinforcing and toughening mechanism was discussed based on the experimental results and micrographs of the fracture surfaces.It was found that the compressive strength and split tensile strength were in-creased by 8 % and 15 %,respectively,when the whisker mass content was 5 %.The flexural strength and work of fracture of the compos-ite were increased by 12 % and 56 %,respectively,due to whisker-cement coalition debonding,whisker peeling and whisker impact break-age mechanisms when the whisker content was 10 %.However,the investigation indicated that the incorporation of CaCO3 whisker won’t lead to a very significant effect on high-strength cement-based materials;Further more,the interfacial bonding strength between whisker and cement matrix should be proper weak such that the optimal toughening effect could be achieved via the crack deflection mechanism.