钢-聚乙烯醇纤维对地聚合物混凝土力学与抗冻性能的影响研究

Study on the effect of steel-polyethylene fiber on mechanics and frost resistance of geopolymer concrete

地聚合物具有来源广泛、价格低廉等优势,在建筑工程领域得到了广泛的应用。为了分析钢纤维和聚乙烯醇纤维对地聚合物混凝土力学与抗冻性能的影响规律,制备了不同钢纤维和聚乙烯醇纤维添加量的地聚合物混凝土样品,测试了其抗压强度、弹性模量、抗拉强度、冲击韧性和抗冻性能,确定了最佳复合纤维掺量。研究结果表明,地聚合物混凝土抗压强度、弹性模量、劈裂抗拉强度、冲击韧性以及抗冻性均随钢纤维以及聚乙烯醇纤维掺量的增大而出现先升后降的变化规律,纤维掺量为0.9%~1.2%时,地聚合物混凝土的力学性能、抗冲击性能以及抗冻性能最好,且混杂纤维掺加优于单独掺加聚乙烯醇纤维或单独掺加钢纤维。

Geopolymer has been widely used in the field of construction engineering because of its advantages of wide source,low price.In order to analyze the effect of steel fiber and polyvinyl alcohol fiber on the mechanics and frost resistance of geopolymer concrete,the samples of geopolymer concrete with different steel fiber and polyvinyl alcohol fiber were prepared,and their compressive strength,elastic modulus,tensile strength,impact toughness and frost resistance were tested.The optimal composite fiber content was determined.The results show that the compressive strength,elastic modulus,splitting tensile strength,impact toughness and frost resistance of geopolymer concrete all increase first and then decrease with the increase of the content of steel fiber and polyvinyl alcohol fiber.When the content of fiber is 0.9%~1.2%,the mechanical properties,impact resistance and frost resistance of geopolymer concrete are the best,and mixed fiber is better than polyvinyl alcohol fiber or steel fiber alone.