钢纤维自应力混凝土力学性能试验研究

Research on the Basic Mechanical Properties of Steel Fiber Reinforced Self-stressing Concrete

研究了在三维乱向分布钢纤维的限制下 ,掺有钢纤维的硫铝酸盐自应力混凝土(SFRSC)的直接拉伸、抗压、劈拉、抗折强度特性 .由于钢纤维和基体间的摩阻限制所引入的自应力和钢纤维的三向限制作用 ,使得钢纤维对于自应力混凝土的增强效应要比对于普通混凝土的高 .另外 ,在现有钢纤维混凝土强度计算模式的基础上 ,通过优化方法得出了对于不同目标自应力等级的自应力混凝土的钢纤维增强效应系数 .

Based on a series of experiments, this paper studied the fundamental properties of a new type of high performance fiber reinforced concrete, steel fiber reinforced sulphate-aluminate self-stressing concrete (SFRSC). The direct tensile strength, compressive strength, splitting tensile strength and flexural strength were tested. Through the bonding forces between steel fibers and expansive concrete matrix and the three-dimensional limitation of steel fibers, self-stresses are introduced to SFRSC. Owing to this kind of effects, the strengthening effects of steel fibers on concrete strengths are improved by adding another strengthening coefficient ks to original coefficient αm. Based on the current strength design formulation of steel fiber concrete, the strengthening coefficients are obtained through regressing and optimizing analysis on experimental data. It has been attested that SFRSC could be used as a kind of applicable high performance concrete composite in engineering application.