引用本文摘 ? 要：研究了再生粗骨料取代率、纖維的體積摻量和摻入方式對再生混凝土性能的影響，根據實測應力-應變曲線，計算出了各組試件的壓縮韌度指數和彈性模量。結果表明：再生混凝土的抗壓強度略低于天然骨料混凝土，摻入纖維可顯著提高再生混凝土的抗壓強度、韌性和彈性模量；單摻時，對于抗壓強度和彈性模量，玻璃纖維、PVA纖維的最佳摻量分別為0.45%、0.05%，對于韌性，玻璃纖維、PVA纖維的最佳摻量分別為0.45%、0.10%；當再生粗骨料取代率為50%時，玻璃纖維和PVA纖維混雜摻加對再生混凝土抗壓強度、韌性和彈性模量的提升效果優于單一纖維；當再生粗骨料取代率為100%時，單一纖維對再生混凝土抗壓強度、韌性和彈性模量的提升效果優于混雜纖維。 Abstract: The effects of recycled coarse aggregate replacement rate, fiber volume content and fiber mixing method on the properties of recycled concrete were studied. According to the measured stress-strain curve, the compressive toughness index and elastic modulus were calculated. The results show that the compressive strength of recycled concrete is slightly lower than that of natural aggregate concrete, and the addition of fibers can significantly improve the compressive strength, axial toughness and elastic modulus of recycled concrete. In single blending, for compressive strength and elastic modulus, the optimum content of glass fiber and PVA fiber is 0.45% and 0.05% respectively, and for toughness, the optimum content of glass fiber and PVA fiber is 0.45% and 0.10% respectively. When the replacement rate of recycled coarse aggregate is 50%, the improvement effect of mixed addition of glass fiber and PVA fiber on the compressive strength, toughness and elastic modulus of recycled concrete is better than that of single fiber. When the replacement rate of recycled coarse aggregate is 100%, the improvement effect of single fiber on the compressive strength, toughness and elastic modulus of recycled concrete is better than that of hybrid fiber.
牛海成,吉珈琨,張耀宗.混雜纖維再生混凝土軸壓應力-應變關系研究[J].混凝土與水泥制品,2022(1):58-63. NIU H C,JI J K,ZHANG Y Z.Stress-strain Relationship of Hybrid Fiber Reinforced Recycled Concrete Under Axial Compression[J].China Concrete and Cement Products,2022(1):58-63.