掺加热活化油页岩半焦混凝土的耐久性

摘要/Abstract

摘要： 为探究热活化油页岩半焦对混凝土耐久性的影响,进一步推广应用油页岩半焦-水泥混凝土,本文采用混凝土碳化试验、抗氯离子渗透试验以及抗冻性试验,探究不同活化煅烧温度(300、400、500和600 ℃)与不同掺量(0%、5%、10%、15%、20%和25%,质量分数)油页岩半焦对混凝土耐久性的影响,并采用核磁共振(NMR)测试分析混凝土内部孔径分布和孔隙度,从孔径分布特征揭示油页岩半焦对混凝土耐久性的影响机理。结果表明:相对于油页岩半焦活化煅烧温度,油页岩半焦掺量对混凝土耐久性的影响更为显著;油页岩半焦的掺入会降低混凝土的抗碳化性能,但25%掺量下仍能满足规范设计值要求,碳化深度远小于20 mm;抗氯离子渗透性也会随油页岩半焦的掺入而降低,掺量不高于25%时仍处于低渗透率区间;5种油页岩半焦掺量的混凝土均能满足150次的冻融循环要求,整体而言其具有较好的耐久性;此外,油页岩半焦的掺入明显改变了混凝土内部的孔径分布及孔隙数量,因而对混凝土的耐久性产生不同程度的影响。

关键词: 混凝土, 油页岩半焦, 耐久性, 碳化深度, 核磁共振

Abstract: In order to investigate the effect of heat activated oil shale semi-coke on the durability of concrete, and promote the application of cement-oil shale semi-coke concrete, the effects of different activation and calcination temperatures (300, 400, 500 and 600 ℃) and different content (0%, 5%, 10%, 15%, 20% and 25%, mass fraction) of oil shale semi-coke on the durability of concrete were investigated using the concrete carbonation test, chloride ion penetration resistance test and frost resistance test. The nuclear magnetic resonance (NMR) test was used to analyze the pore size distribution and porosity of concrete, and the influence mechanism of oil shale semi-coke on the durability of concrete was revealed from the pore size distribution characteristics. The results show that compared with the activation and calcination temperature of oil shale semi-coke, the effect of content on the concrete durability is more significant. The incorporation of oil shale semi-coke reduces the carbonation resistance of concrete, but it still meets the requirements of the standard design value at 25% content. And the carbonation depth is far less than 20 mm. The chloride ion penetration resistance also decreases with the incorporation of oil shale semi-coke, and it is still in the low permeability range when the content is not higher than 25%. 5 kinds of oil shale semi-coke content of concrete can meet the requirements of 150 times freeze-thaw cycles, overall having good durability. In addition, the incorporation of oil shale semi-coke significantly changes the pore size distribution and pore number inside concrete, thus affecting the durability of concrete to varying degrees.

Key words: concrete, oil shale semi-coke, durability, carbonation depth, nuclear magnetic resonance

中图分类号:

U414

杜晓伟, 刘辉, 李文举, 曹楷. 掺加热活化油页岩半焦混凝土的耐久性[J]. 硅酸盐通报, 2023, 42(4): 1428-1436.

DU Xiaowei, LIU Hui, LI Wenju, CAO Kai. Durability of Heat Activated Oil Shale Semi-Coke Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(4): 1428-1436.

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