摘要
砂浆、混凝土结构的建筑物在使用过程中会出现不同程度的裂纹,用纤维增强砂浆或混凝土改善裂纹的研究成为热点,其中织物的增强效果尤其明显,可改善单纤维增强的方向局限性。
本文从织物的密度、层数和几何形态方面来探讨织物对砂浆或混凝土的增强作用。在普通织机上研制出纱罗织物与单层、双层、四层平板织物及十字形立体织物的基础上,制作相应的砂浆与混凝土增强试件,测试其抗折强度和劈裂抗拉强度,研究织物对墙体粉刷层和墙体结构的增强性能。
织物对墙体粉刷层的增强研究表明:织物比短纤维更能增加砂浆的抗折强度,比素砂浆、纤维砂浆分别提高了9.7%、6.25%;织物的密度越大,即单位体积的织物含量越高,织物对砂浆或混凝土的增强效果越好,经密在50根·(10cm)-1至60根·(10cm)-1为宜;在一定厚度的砂浆内,平铺织物的层数越多,织物增强砂浆的效果越好,3cm厚的砂浆中,3至4层为好;织物在试件中放置的位置不同,对砂浆增强强度的影响也不同。
织物对墙体结构的增强研究表明:织物结构对织物增强混凝土的抗折强度和劈裂抗拉强度有一定的影响,十字形织物对混凝土抗折强度的增强作用好于平板织物。
Constructions made of grout or concrete always appears to cracks. Studies on fiber-reinforced grout or concrete are very popular, especially, fabrics whose effects are more visible can reduce direction limit of fiber.
In terms of fabric density, layers and geometry, the text discusses effects on strength of grout or concrete which the fabrics take. Manufacture leno woven, one-lay, two-layer, four-layer planar fabrics and cross-shaped fabrics; make grout or concrete specimens; measure tensile strength and curve strength of fabric-reinforced grout or concrete; study the fabrics’reinforcing functions to the wall rendering surface and the wall configuration.
The studies of wall rendering with fabric says: fabric is better than fiber; bigger the fabric density is, bigger the strength of grout or concrete is. The warp density of from fifty per ten centimeters to sixty is suitable; more the fabric layers are, bigger the strength is, but the layer shouldn’t be so many. The layer from 3 to 4 in 3- centimeter-thick grout is good; The place of fabric in specimen will affect the strength.
The studies of wall configuration say: fabric structure takes effects on tensile strength and curve strength of fabric-reinforced concrete. Cross-shaped fabrics take better function than planar fabrics do.
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