聚甲醛纤维水泥砂浆耐紫外老化性能的研究
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摘要
针对聚甲醛纤维耐紫外老化性较差的特性,研究了随纤维长度和掺量变化聚甲醛纤维水泥砂浆耐紫外老化性能的演变规律。研究表明:紫外老化作用可加快砂浆的水泥水化,提高聚甲醛纤维砂浆的抗折和抗压强度,其中长度为6mm、掺量为0.2%时较高。聚甲醛纤维可减缓砂浆表面因紫外老化产生的收缩开裂,提高砂浆表面的显微硬度,其中纤维掺量为0.1%,长度低于9mm的砂浆显微硬度较高。紫外老化作用对水化早期的聚甲醛纤维水泥砂浆耐磨度的影响较小,可提高水化后期纤维掺量低于0.2%的砂浆耐磨度,而纤维长度超过12mm时耐磨性能有所降低。
According to the characteristics of poor anti-ultraviolet aging performance for polyoxymethylene fiber, the anti-ultraviolet aging performance of cement mortar with polyoxymethylene fiber length and content was investigated. The results show that ultraviolet aging can promote the cement hydration, and increase the compressive resistance and flexural strength of polyoxymethylene fiber-cement mortar, which are higher when the fiber of 6 mm length and 0.2% content. Polyoxymethylene fiber can mitigate the drying shrinkage cracking in surface of cement mortar because of the ultraviolet aging, causing the increase of cement mortar micro-hardness, and it is higher when the fiber length is less than 9 mm and content is 0.1%. The effect of ultraviolet aging on abrasion index of cement mortar with polyoxymethylene fiber at early hydration is less; however it can improve the abrasion index when content is less than 0.2% at later hydration, and the abrasion resistance is lower as the fiber length above 12 mm.
According to the characteristics of poor anti-ultraviolet aging performance for polyoxymethylene fiber, the anti-ultraviolet aging performance of cement mortar with polyoxymethylene fiber length and content was investigated. The results show that ultraviolet aging can promote the cement hydration, and increase the compressive resistance and flexural strength of polyoxymethylene fiber-cement mortar, which are higher when the fiber of 6 mm length and 0.2% content. Polyoxymethylene fiber can mitigate the drying shrinkage cracking in surface of cement mortar because of the ultraviolet aging, causing the increase of cement mortar micro-hardness, and it is higher when the fiber length is less than 9 mm and content is 0.1%. The effect of ultraviolet aging on abrasion index of cement mortar with polyoxymethylene fiber at early hydration is less; however it can improve the abrasion index when content is less than 0.2% at later hydration, and the abrasion resistance is lower as the fiber length above 12 mm.
引文
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[6]侯帅,王文年,曾宪森,等.聚甲醛纤维增强混凝土劈裂抗拉强度的研究[J].武汉纺织大学学报, 2013, 26(3):39-42.
[7]田国峰,李建华,战佳宇,等.聚甲醛纤维对砂浆性能的影响研究[J].混凝土与水泥制品, 2017(7):51-54.
[2]李相明,覃俊,何勇,等.高性能聚甲醛纤维的研究进展与应用[J].合成纤维, 2008, 37(12):5-9.
[3]刘露.聚甲醛纤维表面改性及其增强混凝土力学性能的研究[D].武汉:武汉纺织大学, 2013.
[4]赵微微.聚甲醛纤维的制备及增强地质聚合物性能的研究[D].北京:北京化工大学, 2016.
[5]刘露,侯帅,吴静,等.聚甲醛纤维增强混凝土抗折性能研究[J].武汉纺织大学学报, 2013, 26(3):35-38.
[6]侯帅,王文年,曾宪森,等.聚甲醛纤维增强混凝土劈裂抗拉强度的研究[J].武汉纺织大学学报, 2013, 26(3):39-42.
[7]田国峰,李建华,战佳宇,等.聚甲醛纤维对砂浆性能的影响研究[J].混凝土与水泥制品, 2017(7):51-54.