孔隙结构对掺加陶瓷粉混凝土抗冻性的影响

刘紫玫; 姚占全; 王宗熙; 吴晗晗

doi:10.13204/j.gyjzG20032908

孔隙结构对掺加陶瓷粉混凝土抗冻性的影响

doi: 10.13204/j.gyjzG20032908

内蒙古农业大学水利与土木建筑工程学院, 呼和浩特 010018

基金项目:

内蒙古农业大学博士科研启动基金项目（BJ2014-4）。

详细信息

作者简介:
刘紫玫,女,1996年出生,硕士。

通讯作者:
姚占全,男,工学博士,教授,ndyzq@imau.edu.cn。

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- 文章访问数: 117
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- 被引次数: 0
出版历程
- 收稿日期: 2020-03-29
- 网络出版日期: 2021-06-04

EFFECT OF PORE STRUCTURE ON FROST RESISTANCE OF CONCRETE MIXED WITH CERAMIC POWDER

College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China

摘要

摘要: 利用陶瓷粉作掺料替代水泥，复掺矿粉配制混凝土，对其每25次冻融循环后测定混凝土质量、抗压强度以及动弹性模量，分析其抗冻性，建立冻融损伤模型并进行寿命预测，通过核磁共振（NMR）测试分析混凝土冻融前后微观孔隙特征，引入灰熵理论将微观孔隙结构与混凝土耐久性联系起来，得到影响陶瓷混凝土抗冻性的主要影响因素，并在此基础上建立冻融后混凝土抗压强度预测GM模型。结果表明：冻融循环后期掺加陶瓷粉的混凝土质量、强度以及弹性模量损失较小，抗冻耐久寿命最高可达到32年；混凝土T₂谱面积、孔隙度、自由流体饱和度以及大孔径孔隙随冻融循环的进行而增大，陶瓷粉加入可减轻孔隙结构劣化程度；主要影响陶瓷粉混凝土抗冻性的孔隙特征参数为孔隙度、束缚流体饱和度和0.05~0.2 μm孔径，由此建立的GM模型的平均相对误差为4.43%。
- 混凝土 /
- 陶瓷粉 /
- 抗压强度 /
- 冻融循环 /
- 核磁共振 /
- 灰熵
Abstract: Ceramic powder is used as an admixture to replace cement, and then mixed with mineral powder to prepare concrete. The mass, compressive strength and dynamic elastic modulus of concrete were determined to analyze the frost resistance after 25 freeze-thaw cycles. The freeze-thaw damage model was established to forecast durability life. Nuclear magnetic resonance (NMR) test was carried out to analyze the microporosity characteristics of concrete after freeze-thaw cycles. The grey entropy analysis was introduced to link micro-pore structure with concrete durability, and the main factors affecting the frost resistance of the concrete mixed with ceramic powder were obtained pore structure to frost resistance. On this basis, the prediction model of compressive strength after freeze-thaw cycles was established.The results showed that the loss of mass, compressive strength and dynamic elasticity modulus of concrete mixed with ceramic powder was less at the later stage of freeze-thaw cycles. The maximum durability frost-resistant life could reach 32 years. T₂ spectrum area, porosity, free fluid saturation and larger size pore ratio increased with freeze-thaw cycles.The addition of ceramic powder could reduce the deterioration of pore structure.The pore characteristic parameters that mainly affected the frost resistance of ceramic powder concrete were porosity, bound fluid saturation and the pore size of 0.05 to 0.2 μm, and the average relative error of the GM model was 4.43%.
- concrete /
- ceramic powder /
- compressive strength /
- freeze-thaw cycles /
- nuclear magnetic resonance /
- grey entropy

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