聚乙烯醇纤维增强水泥基复合材料单轴受压强度与变形特性分析  

ANALYSIS OF STRENGTH AND DEFORMATION PROPERTIES ON PVA-ECC UNDER UNIAXIAL COMPRESSION

作　　者：李艳[1] 程格格[1] 刘泽军[1] 

机构地区：[1]河南理工大学土木工程学院,河南焦作454003

出　　处：《工业建筑》2017年第4期122-126,158,共6页Industrial Construction

基　　金：国家自然科学基金项目(51208183);河南省科技攻关项目(132102310312);河南省高等学校青年骨干教师资助项目(2014GGJS-043);河南省高等学校重点科研项目(17A560005)

摘　　要：通过对不同聚乙烯醇(PVA)纤维体积掺量、水胶比、砂胶比的工程纤维增强水泥基复合材料(ECC)进行单轴受压性能试验,测得了其抗压强度及单轴受压应力-应变全曲线,主要分析PVA-ECC的破坏形态、受压性能及试件尺寸、加载速率对PVA-ECC立方体抗压强度的影响。结果表明:随着PVA纤维体积掺量的增加,PVA-ECC的抗压强度、峰值应变及极限应变均明显增大,试件塑性变形能力也越好;水胶比增大,PVA-ECC的抗压强度降低,但试件达到峰值后延性增加;砂胶比为0.36时,PVA-ECC的抗压强度和压缩韧性最大。PVA-ECC的立方体抗压强度存在尺寸效应:f100cu∶f70.7cu∶f40cu=0.93∶1∶1.15;加载速率越大,PVA-ECC的立方体抗压强度越高,且对于不同强度的PVA-ECC,加载速率的影响趋势相同。根据试验结果得出立方体抗压强度、峰值应变与纤维体积掺量的关系、轴心抗压强度与立方体抗压强度的关系。Based on unaxial compression experiments of ECC with different PVA fiber content by volume, water-binder ratio and sand-binder ratio, the compressive strength and stress-strain curves were obtained. The paper mainly analyzed the failure mode and compressive performance of PVA-ECC and the effect of specimen size and loading rate on cubic compressive strength. The results showed that the compressive strength, peak strain and ultimate strain significantly increased with the increase of volume content of PVA fiber. The specimens were also of higher plastic deformation capacity. As the increasing of water-binder ratio, the compressive strength reduced while the ductility increased. When the sand-binder ratio was 0. 36, the compressive strength and toughness were maximum. Cubic compressive strength of PVA-ECC had size effect fcu^100： fcu^70.7：fcu^40 equaled 0. 93：1 ： 1.15. As the increasing of loading rate, the compressive strength of PVA-ECC increased and the loading rate had the same effect trend on PVA-ECC with different strength. The paper established relationships between cubic compressive strength or peak strain and fiber content by volume, and between axial compressive strength and cubic compressive strength according to test results.

关 键 词：工程纤维增强水泥基复合材料 聚乙烯醇纤维 单轴受压 强度 变形 

分 类 号：TU528[建筑科学—建筑技术科学]