EFFECT OF PVA FIBERS ON THE PROPERTIES OF CEMENT- BASED MATERIALS
-
摘要: 对一种高性能聚乙烯醇(PVA)纤维在不同掺量下对混凝土和易性、力学性能和抗渗性能的影响展开研究,分析纤维种类及掺量对控制砂浆塑性收缩裂缝的作用机理。结果表明:掺入适量PVA纤维不会对混凝土的和易性产生影响,但当纤维掺量达到6.5 kg/cm3时,会对混凝土的和易性产生负面作用;PVA纤维可以适当提高混凝土抗压强度,显著增加其劈裂抗拉强度,但当掺量超过一定值时,力学性能会有所下降;在水泥基材料中掺入PVA和聚丙烯(PP)纤维,均可有效改善材料的抗裂性能,从而提高其抗渗性能,其中PVA纤维对抗渗性能改善效果更加明显。Abstract: It was investigated that the effects of Polyvinyl Alcohol ( PVA) fiber on the workability,mechanical properties and impermeability of concrete. The influences of PVA and Polypropylene ( PP) fiber on the plastic shrinkage crack of mortar were also studied. Results show that PVA fiber has no negative effect on the workability in a certain range,but exerts an adverse effect when the addition is up to 6. 5 kg/cm 3. The PVA fiber in concrete can improve the compressive strength performance,especially the splitting tensile strength of concrete. When PVA and PP fibers are mixed into cement-based materials,crack resistance and impermeability are effectively improved.
-
Key words:
- PVA fiber /
- crack /
- compressive strength /
- splitting tensile strength /
- impermeability
-
沈荣熹,崔琪,李青海. 新型纤维增强水泥基复合材料[M].北京: 中国建材工业出版社,2004. [2] 沈荣熹,王璋水,崔玉忠. 纤维增强水泥纤维与纤维增强混凝土[M]. 北京: 化学工业出版社,2006. [3] 邓宗才. 高性能合成纤维混凝土[M]. 北京: 科学出版社,2003. [4] 孙家瑛. 混杂聚丙烯纤维混凝土性能研究[J]. 混凝土,2003(11): 16-20. [5] Li V C,Backer S,Wang Y,et al. Toughened Behavior and Mechanisms of Synthetic Fiber Reinforced Normal Strength and High Strength Concrete[G]∥ Swamy R N,Barr B. Fiber Reinforced Cements and Concretes: Recent Developments.London: Elsevier Applied Science,1989: 420-433. [6] 陈婷,詹炳根. 设计 PVA 纤维水泥基复合材料的研究进展[J]. 混凝土,2003 (11): 3-6. [7] 王永波. PVA 纤维增强水泥基复合材料的性能研究[D]. 重庆: 重庆大学,2005. [8] 薛会青,邓宗才,李建辉. PVA 纤维水泥基复合材料的抗拉性能及韧性研究[J]. 郑州大学学报:工学版,2009,30(1):92-95. [9] Li V C,Wang S,Wu C. Tensile Strain-Hardening Behavior ofPVA-ECC [J]. ACI Mater J,2001,98 (6): 483-492. [10] Kraai P P. A Proposed Test to Determine the Cracking PotentialDue to Drying Shrinkage of Concrete[J]. Concrete Construction,1985(3): 775-777. [11] Alhozaimy A M,Soroushian P,Mirza F. Mechanical Properties of Polypropylene Fiber Reinforced Concrete and the Effects of Pozzolanic[J]. Cement and Concrete Composites,1996 (18):85-92. [12] Kim J H,Robertson R E,Naaman A E. Structure and Propertiesof Poly (Vinylalcohol)-Modified Mortar and Concrete[J]. Cementand Concrete Research,1999,29(3): 407-415. [13] 王海波,孙诗兵,林波. 聚乙烯醇纤维对砂浆阻裂性能的影响[J]. 建筑技术,2005,36(4): 293-294. [14] 袁震宇,吴慧敏,杨建西. 聚丙烯纤维对砂浆抗裂性能影响的试验研究[J]. 混凝土与水泥制品,1999(6): 41-42. [15] 林水东,程贤甦,林志忠. PP 和 PVA 纤维对水泥砂浆抗裂和强度性能的影响[J]. 混凝土与水泥制品,2005 (1): 43-45. [16] 徐至钧. 纤维混凝土技术及应用[M]. 北京: 中国建筑工业出版社,2003.
点击查看大图
计量
- 文章访问数: 102
- HTML全文浏览量: 8
- PDF下载量: 136
- 被引次数: 0