粉煤灰再生混凝土符合“十三五”规划绿色发展理念,粉煤灰及再生骨料等废弃物的有效利用具有重大的经济意义和环保意义。试验设计了不同粉煤灰掺量(0%,15%,25%,35%,45%)的再生混凝土,研究粉煤灰再生混凝土的碳化规律,并建立碳化预测模型。结果表明:混凝土的碳化深度与碳化时间及粉煤灰掺量呈正比关系;CO2扩散系数与粉煤灰掺量呈线性函数关系。建立了基于CO2扩散系数的碳化深度预测模型,模型的建立为粉煤灰再生混凝土的应用提供了重要支撑。
Abstract
Adding fly ash in recycled concrete accords with the concept of “The 13th Five-Year Green Development Plan”. The reasonable use of fly ash and recycled aggregate wastes is of great significance for economy and environment. In this research, we designed recycled concrete specimens dosed with different content of fly ash (0%, 15%, 25%, 35% and 45%) to investigate the rule of carbonization of recycled concrete mixed with fly ash. Results demonstrate that the carbonization depth of concrete is in positive relation with carbonizing age and fly ash content; the coefficient of CO2 diffusion is in a linear functional relation with fly ash content. Moreover, we built a prediction model for carbonization depth based on the coefficient of CO2 diffusion.
关键词
再生混凝土 /
粉煤灰掺量 /
碳化深度 /
预测模型 /
CO2扩散系数
Key words
recycled concrete /
fly ash dosage /
carbonization depth /
prediction model /
coefficient of CO2 diffusion
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基金
内蒙古自治区自然科学基金项目(2017BS0505)
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