粉煤灰掺量对不同骨料混凝土长期强度的影响

发布时间：2018-05-27 03:28

本文选题：粉煤灰 + 再生混凝土　；参考：《硅酸盐通报》2017年07期

【摘要】：试验着眼于C30强度等级混凝土,以不同粗骨料(再生骨料、天然骨料)、粉煤灰掺量(15%、30%、50%)及养护环境(标养、室内自然养护)为变量探究粉煤灰对不同骨料混凝土长期强度的影响。试验结果表明,随着粉煤灰取代率的增加,在龄期较短时表现出对再生混凝土及普通混凝土的强度贡献率都有所下降的趋势,但后期经养护龄期的增加,180 d以后中长期强度贡献率下降幅度有所趋缓;当养护环境为标准养护时,粉煤灰取代率为30%以内试件的强度贡献率在180 d时达到了最大,之后强度贡献率有所下降,粉煤灰取代率为50%时,养护龄期超过180 d其强度贡献率也会有所增加;当养护环境为室内自然养护时,随着养护龄期的增长对不同取代率粉煤灰、不同骨料混凝土的中长期强度贡献率都有所加大。
[Abstract]:The test focuses on C30 strength grade concrete. The effects of fly ash on the long-term strength of different aggregate concrete are studied with different coarse aggregate (recycled aggregate, natural aggregate, fly ash) and curing environment (standard maintenance, indoor natural conservation). The experimental results show that with the increase of the replacement ratio of fly ash, the strength contribution rate of recycled concrete and ordinary concrete decreases in a short period of time. However, the decreasing range of the medium and long term strength contribution rate after 180 days after the later curing age increased, and when the curing environment was the standard curing condition, the strength contribution rate of the specimen within 30% of the replacement rate of fly ash reached the maximum at 180 days. After that, the strength contribution rate decreased, and when the replacement rate of fly ash was 50, the strength contribution rate of fly ash increased when the curing age was more than 180 days, and when the curing environment was indoor natural conservation, with the increase of curing age, the strength contribution rate of fly ash increased with the increase of curing age. The medium and long term strength contribution rate of different aggregate concrete has been increased.
【作者单位】：辽宁工程技术大学土木工程学院;
【基金】：辽宁省“十百千高端人才引进工程”(50GD02)
【分类号】：TU528

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