| 镁渣对C30混凝土干燥收缩的作用效应研究 |
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| 引用本文： | 李姗姗,崔自治.镁渣对C30混凝土干燥收缩的作用效应研究[J].中国农村水利水电,2014,0(6):158-160. |
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| 作者姓名： | 李姗姗 崔自治 |
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| 作者单位： | 1. 宁夏大学 |
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| 基金项目： | 镁渣混凝土的尺寸稳定性研究;教育部创新团队项目 |
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| 摘 要： | 针对镁渣利用率低，现代混凝土尺寸稳定性要求高的问题，考虑利用镁渣水化后的体积膨胀性补偿混凝土的收缩变形，以镁渣取代率为主要因素，运用无约束收缩变形的非接触法和接触法实验研究镁渣对混凝土早龄期(3d)以及长期(180d)干燥收缩的影响，揭示作用规律，探讨作用机理，为镁渣的资源化利用提供新的科学依据，混凝土尺寸稳定性的提高提供一条经济有效的措施。研究表明：混凝土的干燥收缩随镁渣取代率的增大而减小，干燥收缩的发展与水泥的水化进程基本一致；混凝土的早龄期干缩变形占总干缩变形的比重较大，减小混凝土干燥收缩变形的重点在早期；镁渣能显著减小混凝土的干燥收缩，在取代率不大于25%时，混凝土的干燥变形一直处于收缩状态，无膨胀现象。
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| 收稿时间： | 2013-12-23 |
| 修稿时间： | 2014-01-08 |
The effect of magnesium slag on the drying shrinkage of concrete C30 |
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| Abstract: | In view of the low utilization rate of magnesium slag, high size stability requirement of modern concrete problem, using the volume expansion of magnesium slag to compensate the shrinkage deformation of concrete, taking the magnesium slag replacement rate as the main factor, the influence of magnesium slag on early age (3d) and long-term (180d) drying shrinkage deformation of concrete was studied by using unconstrained non contact method and contact method, revealing the law, exploring the mechanism, providing new scientific basis for resource utilization of magnesium slag, an economic and effective measures for improving the dimensional stability of concrete. Research shows that: the drying shrinkage of concrete decrease with magnesium slag replacement rate, the development of drying shrinkage and the hydration process of cement is consistent; the early age shrinkage deformation of concrete takes up a larger proportion of the total drying shrinkage deformation, the key to reduce drying shrinkage deformation of concrete is in the early days; magnesium slag can significantly reduce the drying shrinkage of concrete, when the replace rate is not greater than 25%, the drying deformation of concrete has been in the state of contraction, no expansion phenomenon. |
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