掺合料混凝土早期强度的试验研究

发布时间：2019-03-18 17:47

【摘要】：通过不同掺合料种类及掺量的掺合料混凝土早期抗压强度试验,分析粉煤灰掺量、矿粉掺量、煤矸石掺量对混凝土强度的影响规律,并研究双掺、三掺掺合料对混凝土强度的交互作用。研究结果表明:随着粉煤灰掺量的增加,粉煤灰混凝土抗压强度减小,但后期抗压强度增长幅度增大;矿粉掺量对矿粉混凝土的抗压强度和强度增长规律的影响不明显;掺入小于20%的煤矸石混凝土强度早期强度明显降低而后期强度变化不明显,掺入超过30%的煤矸石各龄期混凝土抗压强度均有明显降低;在矿粉混凝土中掺入粉煤灰,混凝土抗压强度随粉煤灰掺量的增加而减少,但减小幅度随龄期的增长而减小;在粉煤灰混凝土中掺入矿粉,混凝土强度有不同程度的提高;在煤矸石混凝土中掺入粉煤灰,混凝土抗压强度随粉煤灰掺量的增加而减小,减小幅度随龄期的增长而变化不大;在粉煤灰混凝土中掺入煤矸石会导致混凝土早期强度降低但后期强度提高;在煤矸石混凝土中掺入小于40%矿粉时混凝土抗压强度略有提高,而掺入超过40%矿粉时抗压强度降低;若在矿粉混凝土中掺入煤矸石,对矿粉掺量小于40%的混凝土强度影响不大,矿粉掺量大于40%时混凝土强度降低。
[Abstract]:Through the experiment of early compressive strength of concrete with different admixture types and contents, the influence of fly ash content, mineral powder content and coal gangue content on the strength of concrete is analyzed, and the double admixture is studied, and the effect of coal gangue content on concrete strength is analyzed, and the effect of coal gangue content on concrete strength is analyzed. The interaction of three admixtures on the strength of concrete. The results show that with the increase of fly ash content, the compressive strength of fly ash concrete decreases, but the later compressive strength increases, and the influence of the content of mineral powder on the compressive strength and the law of strength growth of fly ash concrete is not obvious. The early strength of coal gangue concrete mixed with less than 20% decreased obviously, but the later strength did not change obviously, and the compressive strength of concrete mixed with more than 30% coal gangue decreased obviously. When fly ash is added into fly ash concrete, the compressive strength of concrete decreases with the increase of fly ash content, but the decreasing extent decreases with the increase of age, and the strength of concrete increases with the addition of mineral powder in fly ash concrete, and the compressive strength of concrete decreases with the increase of fly ash content. When coal gangue concrete is mixed with fly ash, the compressive strength of concrete decreases with the increase of fly ash content, and the decreasing extent does not change much with the increase of age. The addition of coal gangue into fly ash concrete will reduce the early strength of concrete but increase the strength at later stage. When the coal gangue concrete is mixed with less than 40% ore powder, the compressive strength of the concrete increases slightly, while the compressive strength decreases when the coal gangue concrete is mixed with more than 40% ore powder. If coal gangue is added to the concrete, it has little effect on the strength of the concrete with the content less than 40%. When the content of the mineral powder is more than 40%, the strength of the concrete decreases.
【作者单位】：西安建筑科技大学土木工程学院;
【基金】：国家自然科学基金资助项目(51308441) 陕西省自然科学基础研究计划(2016JM5073) 陕西省教育厅专项科研计划项目(2013JK0951)
【分类号】：TU528

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