纖維水泥及制品_2022_《混凝土與水泥制品》雜志社

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纖維水泥及制品

機制砂超高性能混凝土（UHPC）性能影響因素試驗研究

馬正先，趙雅萌，陳炳江，肖文帥，孫立剛

2022年第1期

摘要

引用本文

摘 ? 要：超高性能混凝土（UHPC）在擁有超高力學性能的同時普遍存在流動性較差的問題。為了尋求二者之間的平衡，首先通過單因素試驗分析了石英砂摻量、粉煤灰摻量、減水劑摻量和鋼纖維摻量對UHPC流動性及抗壓強度的影響，其次利用正交試驗得出了各因素對UHPC流動性及抗壓強度影響的主次順序，確定了最優配合比。結果表明：當石英砂摻量為32%（機制砂摻量為68%）、粉煤灰摻量為15%、減水劑摻量為0.39%、鋼纖維摻量為2%時，配制出的UHPC工作性和力學性能良好，并成功應用于某高架橋維修加固工程中。 Abstract: Ultra-high performance concrete (UHPC) generally has the problem of poor fluidity while having ultra-high mechanical properties. In order to find the balance between ultra-high mechanical properties and fluidity, firstly, the effects of quartz sand content, fly ash content, water-reducing agent content and steel fiber content on the fluidity and compressive strength of UHPC were analyzed through single factor tests. Secondly, the primary and secondary order of the influence of various factors on the fluidity and compressive strength of UHPC was obtained by orthogonal test, and the optimal mix proportion was determined. The results show that when the content of quartz sand is 32%(the content of machine-made sand is 68%), the content of fly ash is 15%, the content of water-reducing agent is 0.39%, and the content of steel fiber is 2%, the prepared UHPC has good workability and mechanical properties, and has been successfully applied to a viaduct maintenance and reinforcement project.

馬正先,趙雅萌,陳炳江,等.機制砂超高性能混凝土（UHPC）性能影響因素試驗研究[J].混凝土與水泥制品,2022(1):48-52,63. MA Z X,ZHAO Y M,CHEN B J,et al.Experimental Study on Influencing Factors of Machine-made Sand Ultra-high Performance Concrete (UHPC) Performance[J].China Concrete and Cement Products,2022(1):48-52,63.

PVA纖維混凝土凍融循環損傷規律及模型研究

趙小明1，王新科2，喬宏霞2，黃瑞1

2022年第1期

摘要

引用本文

摘 ? 要：研究了PVA纖維的體積摻量（0.05%、0.10%、0.15%）和長度（8 mm、12 mm）對混凝土相對動彈性模量、質量損失率和力學性能的影響，分析了PVA纖維混凝土的凍融損傷規律，建立了以相對動彈性模量為對象的Weibull概率分布損傷模型。結果表明：隨著凍融循環次數的增加，體積摻量為0.10%、長度為8 mm的PVA纖維對混凝土抗凍性能的提升效果最好；建立的Weibull概率分布損傷模型可以有效反映PVA纖維混凝土的凍融損傷劣化規律，可為實際工程應用提供參考。 Abstract: The effects of PVA fiber volume content (0.05%, 0.10%, 0.15%) and length (8 mm, 12 mm) on the relative dynamic elastic modulus, mass loss rate and mechanical properties of concrete were studied, and the freeze-thaw damage law of PVA fiber reinforced concrete was analyzed, and the Weibull probability distribution damage model based on the relative dynamic elastic modulus was established. The results show that with the increase of freeze-thaw cycles, PVA fiber with volume content of 0.10% and length of 8 mm has the best effect on improving the frost resistance of concrete. The established Weibull probability distribution damage model can effectively reflect the freeze-thaw damage and deterioration law of PVA fiber reinforced concrete, and can provide a reference for practical engineering applications.

趙小明,王新科,喬宏霞,等. PVA纖維混凝土凍融循環損傷規律及模型研究[J].混凝土與水泥制品,2022(1):53-57. ZHAO X M,WANG X K,QIAO H X,et al.Study on Freeze-thaw Cycle Damage Law and Model of PVA Fiber Reinforced Concrete[J].China Concrete and Cement Products,2022(1):53-57.

混雜纖維再生混凝土軸壓應力-應變關系研究

牛海成1，吉珈琨2，張耀宗1

2022年第1期

摘要

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.

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