内掺硅烷乳液的PVA改性水泥基复合材料温度作用后的力学性能研究

Mechanical Property Study on PVA Modified Cementitious Composite Material Mixed with Silane Emulsion after Temperature Effect

掺加PVA纤维的应变硬化水泥基复合材料(SHCC)改善了水泥基材料的脆性,具有较高的抗拉强度和韧性。本研究通过力学性能试验考察了在不同温度作用下,内掺硅烷乳液的PVA-SHCC的抗折、抗压强度和弯曲韧性,结果表明,内掺硅烷乳液对SHCC的力学性能没有明显影响;PVA纤维能明显提高SHCC的强度和韧性,随着温度的升高,纤维增强作用逐渐消失。

The strain hardening cementitious composite material （SHCC） mixed with PVA fiber improves the brittleness of cement based materials and has better tensile strength and tenacity. Through mechanical performance testing, this paper studies the fracture resistance, compressive strength and bend ductility of PVA-SHCC mixed with silane emulsion under different temperature effects. Results show mixing of silane emulsion does not have obvious impact to the mechanical performance of SHCC; PVA fiber can improve the strength and toughness of SHCC apparently; the reinforcing effect of fiber will diminish gradually and disappear along with the rising of temperature.