纤维材料及制品_2024_《混凝土与水泥制品》杂志社

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发布时间：2020-01-06 00:00:00

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纤维材料及制品

河砂粒径与纤维类型对ECC力学性能的影响

李彦宵1，于本田1，*，张占旭2，吴明星1，谢超1

2024年第2期

摘要

引用本文

摘要：研究了河砂粒径（0~0.30、0~0.60、0~1.18、0~2.36 mm）与纤维类型（PVA、PE、PP、BF纤维）对工程水泥基复合材料（ECC）力学性能的影响，并进行了SEM分析。结果表明：随着河砂粒径的增大，试件的28 d极限拉应变、峰值应力和抗折强度基本均降低，多缝开裂特征逐渐减弱；4种纤维中，PVA纤维对ECC单轴拉伸性能和抗折性能的提高效果最好；PVA纤维与各粒级的河砂均具有良好的匹配性，在基体中分散较均匀。 Abstract: The influence of river sand particle size (0~0.30, 0~0.60, 0~1.18, 0~2.36 mm) and fiber types (PVA, PE, PP, BF fibers) on the mechanical properties of engineered cementitious composites (ECC) was studied, and SEM analysis was conducted. The results show that with the increase of river sand particle size, the 28 d ultimate tensile strain, peak stress, and flexural strength of the specimens are basically reduced, and the multi crack cracking characteristics gradually weaken. Among the four types of fibers, PVA fiber has the best effect on improving the uniaxial tensile and flexural properties of ECC. PVA fibers have good compatibility with various particle size of river sand and are evenly dispersed in the matrix.

李彦宵,于本田,张占旭,等.河砂粒径与纤维类型对ECC力学性能的影响[J].混凝土与水泥制品,2024(2):51-55,60. LI Y X,YU B T,ZHANG Z X,et al.Influence of river sand particle size and fiber type on mechanical properties of ECC[J].China Concrete and Cement Products,2024(2):51-55,60.

钢-聚甲醛混杂纤维混凝土的力学性能和韧性研究

杨九光

2024年第2期

摘要

引用本文

摘要：研究了分别单掺和混掺不同掺量和长度的钢纤维和聚甲醛（POM）纤维对混凝土力学性能和韧性的影响，并进行了SEM分析。结果表明：单掺POM纤维对混凝土的抗压强度不利，但采用合适掺量和长度的POM纤维能有效提高混凝土的劈裂抗拉强度；单掺0.50%~1.50%的钢纤维能有效提高混凝土的抗压强度和劈裂抗拉强度；与单掺1.50%的钢纤维相比，混掺适量钢纤维和POM纤维能进一步提高混凝土的力学性能和韧性，推荐钢纤维和POM纤维的混掺比例为5∶1。 Abstract: The effects of different volume contents and lengths of steel fiber and polyoxymethylene(POM) fiber on the mechanical properties and toughness of concrete were studied, and the SEM analysis was conducted. The results show that the single addition of POM fiber is detrimental to the compressive strength of concrete, but adding appropriate content and length of POM fiber can effectively improve the splitting tensile strength of concrete. Adding 0.50%~1.50% content of steel fiber can effectively improve the compressive strength and splitting tensile strength of concrete. Compared with the single addition of 1.50% content of steel fiber, the addition of an appropriate content of steel fiber and POM fiber can further improve the mechanical properties and toughness of concrete, and the recommended mixing ratio of steel fiber and POM fiber is 5∶1.

杨九光.钢-聚甲醛混杂纤维混凝土的力学性能和韧性研究[J].混凝土与水泥制品,2024(2):56-60. YANG J G.Study on mechanical properties and toughness of steel-polyoxymethylene hybrid fiber reinforced concrete[J].China Concrete and Cement Products,2024(2):56-60.

混杂纤维混凝土的工作性、力学性能和弯曲韧性研究

李龙梓，曹鑫铖，叶国林，潘从玲，夏如茜

2024年第2期

摘要

引用本文

摘要：在混杂纤维（PVA、PP纤维）总掺量不变的情况下，研究了纤维混掺比例VPVA∶VPP（0∶5、1∶4、2∶3、3∶2、4∶1、5∶0）对混凝土工作性、力学性能和弯曲韧性的影响。结果表明：随着PVA纤维掺量的增加，混凝土的流动度降低，抗压强度和初裂荷载变化不大，抗折强度、峰值荷载、等效弯曲强度和等效弯曲韧性显著增大。 Abstract: When the total content of hybrid fibers(PVA fiber and PP fiber) remained unchanged, the effects of fiber mixing ratio VPVA:VPP (0:5, 1:4, 2:3, 3:2, 4:1, 5:0) on the workability, mechanical properties and bending toughness of concrete were studied. The results show that with the increase of PVA fiber content, the fluidity of concrete decreases, the compressive strength and initial crack load do not change much, the flexural strength, peak load, equivalent bending strength and equivalent bending toughness significantly increase.

李龙梓,曹鑫铖,叶国林,等.混杂纤维混凝土的工作性、力学性能和弯曲韧性研究[J].混凝土与水泥制品,2024(2):61-64. LI L Z,CAO X C,YE G L,et al.Study on workability, mechanical properties and bending toughness of hybrid fiber reinforced concrete[J].China Concrete and Cement Products,2024(2):61-64.

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