Research on the mechanical performance of specimen combinating strain-hardening cementitious composites and mortar
Research on the mechanical performance of specimen combinating strain-hardening cementitious composites and mortar
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应变硬化水泥基复合材料与砂浆结合试件力学性能研究
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
Xiao
中科院分区：
文献类型：
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作者：
Xiao
水泥基复合材料的低强度和高脆性是其开裂的主要原因，裂缝的形成和扩展会降低混凝土结构的耐久性，将高强高模的PVA纤维应用于水泥基复合材料中可以显著提高其韧性，其表现为伪应变硬化和多裂纹的独特性能。采用点弯曲试验研究了不同养护条件下SHCC与砂浆组合试件的力学性能（标准养护、水养护）、厚度和龄期的影响，结果表明，标准养护优于水养护，浇注24h后再浇注砂浆的工艺显著提高了复合结构的界面粘结性能和整体性能，20mm试件的复合结构的伪应变行为更为显著。此外，该复合结构还将为SHCC的实际应用提供参考。
Low strength and high brittleness are the dominant reason for the cracking of cementitious composites.The durability of concrete structure will be deteriorated with the forming and spread of cracks.Applying PVA fiber with high strength and modulus into cementitious composite can significantly improve the toughness,which behavior in a unique performance of pseudo-strain-hardening and multiple cracking.Four-point bending test was carried out to investigate the mechanical performance of specimen combinating SHCC and mortar with different curing(standard curing,water curing),thickness and age.The results indicate that the standard curing is better than water curing,the interfacial bonding and integral property of the composite structure was significantly enhanced by the technics of casting mortar after the SHCC substrate casted for 24h and the structure with 20mm specimen cambinating SHCC and mortar substrate behavior in more notable pseudo-strain-hardening and multiple cracking.Furthermore,the composite structure will put the practical application of SHCC forward.