Fabric reinforced mortar or concrete technology is developed on the basis of fiber reinforcement, and its research is still in its infancy, and the reinforcement mechanism of fabric in mortar or concrete is still being studied.
(1) The fabric can increase the flexural strength of mortar more than staple fiber, and in a mortar specimen with a thickness of 3cm, the flexural strength of a mortar specimen with a layer of fabric is increased by 9.7% compared with that of a plain mortar specimen, and 6.25% higher than that of a fiber-reinforced mortar specimen; In the mortar per unit volume, although the fiber content is the same, the reinforcement effect of two-dimensional morphological fabric is higher than that of one-dimensional staple fiber;
(2) The integrity of the interface layer between the fabric and mortar or concrete affects the effect of its stress transfer, the interface strength is small, the enhancement effect is poor, and even the strength of the mortar is reduced;
(3) The greater the density of the fabric, that is, the higher the fabric content per unit volume, the better the reinforcement effect of the fabric on mortar or concrete, the weft density is 20 · (10cm)-1, the warp density is 40 · (10cm)-1 and 50 · (10cm)-1 two fabrics, the mortar strength of the latter fabric is 16.2% higher than the former, but the fabric density should not be too large, otherwise the gap formed by the warp and weft yarn in the fabric is too small, and it is difficult for mortar or concrete aggregate to pass through the pores, Reduce the adhesion performance of the fabric with mortar or concrete, and ultimately affect the reinforcement effect of the fabric on mortar or concrete;
(4) In a certain thickness of mortar, the more layers of tiled fabric, the better the effect of fabric reinforcement mortar, 3 to 4 layers in a 3cm thick mortar;
(5) The fabric structure has a certain influence on the flexural strength and splitting tensile strength of fabric-reinforced concrete, and the splitting tensile strength of single-layer, double-layer and four-layer fabric-reinforced concrete is 2.35Mpa, 2.59Mpa, 2.73Mpa, and the flexural strength is 3.2Mpa, 3.5Mpa, and 3.7Mpa, respectively; The splitting tensile strength of single-layer and double-layer cross-shaped three-dimensional fabric reinforced concrete was 2.13Mpa and 2.28Mpa, and the flexural strength was 3.7Mpa and 4.0Mpa, respectively, indicating that the structural form of the fabric was different, and there were many voids in the fabric, which was conducive to improving the strength of concrete. The cross-shaped fabric has a better effect on increasing the flexural strength of concrete than that of flat fabric;
(6) The position of the fabric in the specimen is different, the effect on the mortar reinforcement strength is also different, you can choose the reinforcement direction of the fabric according to the needs, in the main stress bearing direction, the placement of the reinforcement fabric is good reinforcement effect.
The strength of mortar or concrete increases with the increase of fabric density, but the density is too large, and its bonding performance with concrete is not good, so in future research, the bonding performance of fabric and concrete needs to be studied deeply; The strengthening effect of three-dimensional fabrics on mortar or concrete needs to be studied at a deeper level, in addition to the cross-shaped fabric in this paper, other shapes are developed.
