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复合改性再生粗骨料对混凝土性能的影响
Effect of composite modified recycled coarse aggregates on performance of concrete
2023年第10期
复合改性处理;再生粗骨料;混凝土;工作性;力学性能;抗氯离子渗透性能;抗碳化性能
Composite modification treatment; Recycled coarse aggregate; Concrete; Workability; Mechanical property; Chloride ion permeability resistance; Carbonation resistance
2023年第10期
10.19761/j.1000-4637.2023.10.090.05
赖泽成
福建省建筑科学研究院有限责任公司 福建省绿色建筑技术重点试验室,福建 福州 350025

赖泽成

赖泽成.复合改性再生粗骨料对混凝土性能的影响[J].混凝土与水泥制品,2023(10):90-94.

LAI Z C.Effect of composite modified recycled coarse aggregates on performance of concrete[J].China Concrete and Cement Products,2023(10):90-94.

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摘   要:通过加热和颗粒整形对再生粗骨料进行了复合改性处理,对比分析了未改性和改性再生粗骨料的性能,研究了再生粗骨料的掺量对混凝土工作性和抗压强度的影响,优选出了最佳再生粗骨料类型和掺量,并在此基础上,研究了粉煤灰掺量对再生混凝土耐久性能的影响。结果表明:经过复合改性处理后,再生粗骨料的性能得到了强化。随着再生粗骨料掺量的增加,混凝土的坍落度、扩展度和抗压强度基本呈减小趋势;掺改性再生粗骨料混凝土(MRAC)的工作性和抗压强度整体上比掺未改性再生粗骨料混凝土(RAC)的好;综合考虑工作性和抗压强度,改性再生粗骨料的最佳掺量为30%;随着粉煤灰掺量的增加,MRAC的氯离子迁移系数和碳化深度均先减小后增大,推荐粉煤灰掺量为20%~30%。 Abstract: The composite modification treatment of recycled coarse aggregate was carried out through heating and particle shaping, and the performance of unmodified and modified recycled coarse aggregate was compared and analyzed. The influence of the content of recycled coarse aggregate on the workability and compressive strength of concrete was studied, and the optimal type and content of recycled coarse aggregate were selected. On this basis, the effect of fly ash content on the durability of recycled concrete was studied. The results show that the performance of recycled coarse aggregate has been strengthened after composite modification. With the increase of recycled coarse aggregate content, the slump, slump-flow and compressive strength of concrete show a decreasing trend generally. The workability and compressive strength of modified recycled coarse aggregate concrete(MRAC) are generally better than those of unmodified recycled coarse aggregate concrete(RAC). Considering workability and compressive strength comprehensively, the optimal content of modified recycled coarse aggregate is 30%. With the increase of fly ash content, the chloride ion migration coefficient and carbonization depth of MRAC first decrease and then increase, and the recommended fly ash content is 20%~30%.
英文名 : Effect of composite modified recycled coarse aggregates on performance of concrete
刊期 : 2023年第10期
关键词 : 复合改性处理;再生粗骨料;混凝土;工作性;力学性能;抗氯离子渗透性能;抗碳化性能
Key words : Composite modification treatment; Recycled coarse aggregate; Concrete; Workability; Mechanical property; Chloride ion permeability resistance; Carbonation resistance
刊期 : 2023年第10期
DOI : 10.19761/j.1000-4637.2023.10.090.05
文章编号 :
基金项目 :
作者 : 赖泽成
单位 : 福建省建筑科学研究院有限责任公司 福建省绿色建筑技术重点试验室,福建 福州 350025

赖泽成

赖泽成.复合改性再生粗骨料对混凝土性能的影响[J].混凝土与水泥制品,2023(10):90-94.

LAI Z C.Effect of composite modified recycled coarse aggregates on performance of concrete[J].China Concrete and Cement Products,2023(10):90-94.

摘要
参数
结论
参考文献
引用本文

摘   要:通过加热和颗粒整形对再生粗骨料进行了复合改性处理,对比分析了未改性和改性再生粗骨料的性能,研究了再生粗骨料的掺量对混凝土工作性和抗压强度的影响,优选出了最佳再生粗骨料类型和掺量,并在此基础上,研究了粉煤灰掺量对再生混凝土耐久性能的影响。结果表明:经过复合改性处理后,再生粗骨料的性能得到了强化。随着再生粗骨料掺量的增加,混凝土的坍落度、扩展度和抗压强度基本呈减小趋势;掺改性再生粗骨料混凝土(MRAC)的工作性和抗压强度整体上比掺未改性再生粗骨料混凝土(RAC)的好;综合考虑工作性和抗压强度,改性再生粗骨料的最佳掺量为30%;随着粉煤灰掺量的增加,MRAC的氯离子迁移系数和碳化深度均先减小后增大,推荐粉煤灰掺量为20%~30%。

Abstract: The composite modification treatment of recycled coarse aggregate was carried out through heating and particle shaping, and the performance of unmodified and modified recycled coarse aggregate was compared and analyzed. The influence of the content of recycled coarse aggregate on the workability and compressive strength of concrete was studied, and the optimal type and content of recycled coarse aggregate were selected. On this basis, the effect of fly ash content on the durability of recycled concrete was studied. The results show that the performance of recycled coarse aggregate has been strengthened after composite modification. With the increase of recycled coarse aggregate content, the slump, slump-flow and compressive strength of concrete show a decreasing trend generally. The workability and compressive strength of modified recycled coarse aggregate concrete(MRAC) are generally better than those of unmodified recycled coarse aggregate concrete(RAC). Considering workability and compressive strength comprehensively, the optimal content of modified recycled coarse aggregate is 30%. With the increase of fly ash content, the chloride ion migration coefficient and carbonization depth of MRAC first decrease and then increase, and the recommended fly ash content is 20%~30%.

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(1)经过加热与颗粒整形复合改性后,再生粗骨料的性能得到强化,吸水率、压碎指标和质量损失减小,表观密度提高。其中,加热温度为500 ℃的强化效果最好。
(2)随着再生粗骨料掺量的增加,RAC组和MRAC组拌合物的坍落度、扩展度基本呈降低趋势,坍落度、扩展度的1 h经时损失基本呈增大趋势,说明掺入未改性或改性再生粗骨料均会降低混凝土的工作性。综合考虑坍落度、扩展度及其1 h经时损失,当再生粗骨料掺量为30%时,对混凝土工作性的不利影响相对较小。
(3)与基准组NAC相比,RAC组和MRAC组试件的抗压强度均较低。随着再生粗骨料掺量从10%增至100%,RAC组试件的抗压强度降低,而MRAC组试件的抗压强度先增大后减小,改性再生粗骨料的最佳掺量为30%。
(4)掺入适量粉煤灰可有效提高改性再生粗骨料混凝土的抗氯离子渗透性能和抗碳化性能。随着粉煤灰掺量的增加,试件的氯离子迁移系数和碳化深度均先减小后增大,推荐粉煤灰掺量为20%~30%。

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赖泽成.复合改性再生粗骨料对混凝土性能的影响[J].混凝土与水泥制品,2023(10):90-94.

LAI Z C.Effect of composite modified recycled coarse aggregates on performance of concrete[J].China Concrete and Cement Products,2023(10):90-94.

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