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聚酯纤维陶粒混凝土性能试验研究

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为解决陶粒混凝土强度低、脆性大的问题,进行材料设计.通过用页岩陶粒取代碎石、掺入聚酯纤维,制备混凝土试块,进行收缩、抗冻性、抗压强度和劈裂抗拉强度试验.结果表明:陶粒取代率为40％时,混凝土收缩率最小,可抑制其收缩变形;陶粒掺量为40％～60％时能降低混凝土的质量损失率,提高其抗冻性能;陶粒取代率40％、纤维掺量0.08％时,陶粒混凝土的抗压强度、劈裂抗拉强度达到最大值,聚乙烯醇、聚丙烯腈纤维陶粒混凝土的抗压强度分别为49.82和49.63 MPa,两种纤维混凝土的劈裂抗拉强度分别为4.72和4.42 MPa,均可满足现行规定要求;纤维掺量的增加可增大混凝土拉压比,减少脆性破坏;聚乙烯醇纤维增强陶粒混凝土的效果整体上要优于聚丙烯腈纤维.因此,陶粒、纤维最佳掺量分别为40％、0.08％时,聚乙烯醇纤维陶粒混凝土性能最优.
Experimental Study on Performance of Polyester Fiber Ceramsite Concrete
To solve the problem of low strength and high brittleness of ceramsite concrete,the test blocks were prepared by replacing gravel with shale ceramsite and adding polyester fiber for material design.Then the shrinkage test,frost resistance test,compressive strength test and splitting tensile strength test were carried out,respectively.The results show that the shrinkage rate of concrete is the minimum when the replacement rate of ceramsite is 40％,and its shrinkage deformation can be restrained.When the ceramsite content is 40％～60％,the mass loss rate of concrete will be reduced,and the frost resistance of concrete will be improved.When the replacement rate of ceramsite is 40％and the fiber content is 0.08％,the compressive strength and splitting tensile strength of ceramsite concrete reach the maximum.Under this dosage,the compressive strength of polyvinyl alcohol and polyacrylonitrile fiber ceramsite concrete is 49.82 MPa and 49.63 MPa respectively.And the splitting tensile strength of polyvinyl alcohol fiber ceramsite and polyacrylonitrile fiber ceramsite concrete is 4.72 MPa and 4.42 MPa respectively.The strength of polyester fiber reinforced ceramsite concrete can meet the current requirements.The increase of fiber content can increase the tension-compression ratio of concrete,and reduce its brittle failure.As a whole,the effect of polyvinyl alcohol fiber reinforcing ceramsite concrete is better than that of polyacrylonitrile fiber.Therefore,the optimum content of ceramsite and fiber is 40％and 0.08％respectively,and the polyvinyl alcohol fiber ceramsite concrete has the best performance.

road engineeringceramsite concretepolyester fibershrinkage ratemass loss ratecompressive strengthsplitting tensile strengthtension-compression ratio

袁玉卿、张亚静、张业

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河南大学土木建筑学院,河南开封 475004

开封市工程修复与材料循环工程技术研究中心,河南开封 475004

河南财政金融学院工程经济学院,郑州 451464

道路工程 陶粒混凝土 聚酯纤维 收缩率 质量损失率 抗压强度 劈裂抗拉强度 拉压比

河南省高等学校重点科研项目开封市科技攻关计划项目

20A5800012301007

2024

河南大学学报(自然科学版)
河南大学

河南大学学报(自然科学版)

CSTPCD北大核心
影响因子：0.464
ISSN：1003-4978
年,卷(期)：2024.54(4)
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