以钢纤维为对比,研究了不同掺量的非晶合金纤维对水泥砂浆流动性、抗压和抗折强度的影响,提出了预测非晶合金纤维混凝土抗折强度的经验公式,并采用扫描电子显微镜观察纤维与基体的粘结状态。结果表明:与钢纤维相比,非晶合金纤维显著提高了砂浆的力学性能。1.0%掺量下非晶合金纤维增强砂浆28 d抗压强度和抗折强度与未掺纤维试样相比分别增加了28.6%和51.9%,与相同掺量下钢纤维增强砂浆相比分别增加了9.9%和14.5%。非晶合金纤维抗拉强度高,抗腐蚀性能强,在砂浆中分散均匀,与砂浆基体粘结良好,在较低掺量下即可有效提高砂浆的抗压和抗折强度,增加砂浆的韧性。
Abstract
The effects of blending different dosages of amorphous alloy fiber on the fluidity, compressive and flexural strengths of cement mortar were researched through a comparative study of steel fiber. An empirical formula for predicting the flexural strength of cement reinforced by amorphous alloy fiber(AAF) was proposed and the state of bonding between fiber and base material was observed by using scanning electron microscope(SEM). Results indicate that AAF better improves the mechanical properties of cement mortar than steel fiber does. In comparison with specimens without fiber at curing age of 28 d, the compressive and flexural strengths of mortar reinforced by AAF with blending ratio of 1.0% increase by 28.6% and 51.9%, respectively. In comparison with mortar reinforced by steel fiber with equal blending ratio, the two numbers are 9.9% and 14.5%, AAF has advantages such as high tensile strength, strong corrosion resistance and good bonding properties with mortar. It disperses evenly in the mortar, and even at low blending ratio, it could obviously improve the compressive and flexural strengths and toughness of mortar.
关键词
非晶合金纤维 /
钢纤维 /
力学性能 /
水泥砂浆 /
压折比值 /
强度预测
Key words
amorphous alloy fiber /
steel fiber /
mechanical property /
cement mortar /
ratio of compressive strength to flexural strength /
strength prediction
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参考文献
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基金
江苏省自然科学基金项目(BK20151496)
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