SHCC的配制与拉伸性能研究

发布时间：2018-03-03 03:19

本文选题：应变硬化　切入点：水泥基复合材料　出处：《功能材料》2014年21期 　论文类型：期刊论文

【摘要】：采用聚乙烯醇纤维(PVA)纤维作为增强材料,选定不同的粉煤灰掺量、石英砂级配、纤维掺量和养护工艺配制应变硬化水泥基复合材料(SHCC),研究上述因素对SHCC力学性能的影响。研究表明,随着粉煤灰掺量的增加,SHCC极限拉伸强度有少许削弱,但极限拉伸应变不断增加,均高于3%。随着养护龄期增加,SHCC极限拉伸应变呈现先增加后减小的趋势,但拉伸强度随龄期增加而增大。自然养护有利于维持SHCC的高极限拉伸应变;蒸汽养护能提高SHCC早期的极限拉伸强度,但蒸汽养护使SHCC的极限拉伸应变随着龄期增加而明显降低。当m(FA)/m(C)=1.6,2.0和2.4,Vf=2.0%时,采用较细的石英砂和自然养护,28d龄期的SHCC极限拉伸强度在4 MPa以上,极限拉伸应变在3%以上。
[Abstract]:Polyvinyl alcohol fiber (PVA) fiber was used as reinforcing material, different fly ash content and quartz sand gradation were selected. The effects of the above factors on the mechanical properties of strain hardening cement matrix composites (SHCCs) were studied. The results showed that the ultimate tensile strength of SHCC decreased with the increase of the content of fly ash. With the increase of curing age, the ultimate tensile strain of SHCC increased first and then decreased, but the tensile strength increased with the increase of age. Natural curing was beneficial to maintain the high ultimate tensile strain of SHCC. Steam curing can increase the early ultimate tensile strength of SHCC, but steam curing can decrease the ultimate tensile strain of SHCC with increasing age. The ultimate tensile strength of SHCC with fine quartz sand and natural curing age of 28 d is above 4 MPa and the ultimate tensile strain is more than 3%.
【作者单位】：武汉理工大学理学院;
【基金】：国家高技术研究发展计划(863计划)资助项目(2013AA031306) 中央高校基本科研业务费专项资金资助项目(2013-1a-035)
【分类号】：TU528

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