纤维水泥制品_2023_《混凝土与水泥制品》杂志社

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发布时间：2020-01-06 00:00:00

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纤维水泥制品

高温下钢纤维陶瓷骨料混凝土的劈裂抗拉性能研究

刘洋帆，陶俊林

2023年第3期

摘要

引用本文

摘要：研究了温度(20、170、220、270、320、500、750、1 000 ℃)和加载率（0.5 kN/s、5.0 kN/s）对普通混凝土和钢纤维陶瓷骨料混凝土劈裂抗拉性能的影响。结果表明：高温下普通混凝土与钢纤维陶瓷骨料混凝土的劈裂抗拉强度均存在加载率强化效应；普通混凝土的劈裂抗拉强度在20~1 000 ℃内总体表现为温度软化效应，其中，在170~220 ℃内以温度强化效应为主；钢纤维陶瓷骨料混凝土的劈裂抗拉强度表现出明显的温度软化效应；各温度下，钢纤维陶瓷骨料混凝土的的劈裂抗拉强度均高于普通混凝土，表现出良好的耐高温性能。 Abstract: The effects of temperatures (20, 170, 220, 270, 320, 500, 750, 1 000 ℃) and loading rates (0.5 kN/s, 5.0 kN/s) on the splitting tensile properties of ordinary concrete and steel fiber reinforced ceramic aggregate concrete were studied. The results show that the splitting tensile strength of ordinary concrete and steel fiber reinforced ceramic aggregate concrete under high temperature is strengthened by loading rate. The splitting tensile strength of ordinary concrete generally shows the temperature softening effect at 20~1 000 ℃, and the temperature strengthening effect is dominant at 170~220 ℃. The splitting tensile strength of steel fiber reinforced ceramic aggregate concrete shows obvious temperature softening effect. At all temperatures, the splitting tensile strength of steel fiber reinforced ceramic aggregate concrete is higher than that of ordinary concrete, showing good high temperature resistance.

刘洋帆,陶俊林.高温下钢纤维陶瓷骨料混凝土的劈裂抗拉性能研究[J].混凝土与水泥制品,2023(3):51-55. LIU Y F,TAO J L.Study on Splitting Tensile Properties of Steel Fiber Reinforced Ceramic Aggregate Concrete at High Temperature[J].China Concrete and Cement Products,2023(3):51-55.

钢纤维混凝土的受力破坏机制及力学性能研究

任宏伟

2023年第3期

摘要

引用本文

摘要：采用试验和数值模拟相结合的方法，对比研究了普通混凝土和钢纤维混凝土的力学性能、应力-应变响应、破坏特征和声发射规律。结果表明：随着钢纤维体积掺量的增加，试件的抗压和抗折强度均呈先增大后减小的趋势，适宜掺量范围为2.0%~2.5%，超过该掺量范围后，试件的抗压和抗折强度降低；掺入适量钢纤维可增大混凝土的弹性模量和残余强度，增强混凝土的峰后延性，改善混凝土的破坏形态。 Abstract: The mechanical properties, stress-strain response, failure characteristics and acoustic emission laws of ordinary concrete and steel fiber reinforced concrete were compared and studied by means of tests and numerical simulation. The results show that with the increase of steel fiber volume content, the compressive and flexural strength of the specimen first increase and then decrease, and the appropriate content range is 2.0%~2.5%. When the content range is exceeded, the compressive and flexural strength decrease. Adding appropriate content of steel fiber can increase the elastic modulus and residual strength of concrete, enhance the post-peak ductility of concrete, and improve the failure mode of concrete.

任宏伟.钢纤维混凝土的受力破坏机制及力学性能研究[J].混凝土与水泥制品,2023(3):56-59,63. REN H W.Study on the Failure Mechanism and Mechanical Properties of Steel Fiber Reinforced Concrete[J].China Concrete and Cement Products,2023(3):56-59,63.

寒冷地区混凝土路面砖的力学及耐久性能研究

魏清河1，冯启彪2

2023年第3期

摘要

引用本文

摘要：采用正交试验法研究了防水剂掺量、减水剂掺量、聚丙烯纤维掺量和水胶比对混凝土路面砖力学、抗冻及抗盐冻性能的影响。结果表明：随着防水剂掺量的增加，试件的抗折强度先增大后减小，强度损失率和单位面积质量损失减小；随着减水剂掺量的增加，试件的抗折强度增大，强度损失率和单位面积质量损失减小；随着聚丙烯纤维掺量的增加，试件的抗折强度增大，强度损失率和单位面积质量损失减小；随着水胶比的增加，试件抗折强度先增大后减小，强度损失率先减小后增大，单位面积质量损失增大；综合考虑力学性能、抗冻性能和抗盐冻性能，推荐混凝土路面砖的防水剂掺量为2.0%、减水剂掺量为2.0%、聚丙烯纤维掺量为0.5%、水胶比为0.25。 Abstract: The influence of waterproof agent content, water-reducing agent content, polypropylene fiber content and water-binder ratio on the mechanical properties, frost resistance and salt freezing resistance of precast concrete paving units was studied by orthogonal test method. The results show that with the increase of waterproof agent content, the flexural strength of the specimen first increases and then decreases, and the strength loss rate and mass loss per unit area decrease. With the increase of water-reducing agent content, the flexural strength of the specimen increases, and the strength loss rate and mass loss per unit area decrease. With the increase of polypropylene fiber content, the flexural strength of the specimen increases, and the strength loss rate and mass loss per unit area decrease. With the increase of water-binder ratio, the flexural strength of the specimen first increases and then decreases, the strength loss first decreases and then increases, and the mass loss per unit area increases. Considering the mechanical properties, frost resistance and salt freezing resistance of precast concrete paving units, the recommended content of waterproof agent is 2.0%, water-reducing agent is 2.0%, polypropylene fiber is 0.5%, and water-binder ratio is 0.25.

魏清河,冯启彪.寒冷地区混凝土路面砖的力学及耐久性能研究[J].混凝土与水泥制品,2023(3):60-63. WEI Q H,FENG Q B.Study on Mechanical Properties and Durability of Precast Concrete Paving Units in Cold Area[J].China Concrete and Cement Products,2023(3):60-63.

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