化学激发与热处理耦合作用对再生微粉的活性激发

摘要/Abstract

摘要： 为研究化学激发、热处理及两者耦合作用对再生微粉的活化效果,本文采用抗压强度测试、X射线衍射测试、红外光谱测试等对再生微粉的力学性能、矿物组成、反应产物类型进行了研究。结果表明,化学激发能够提供碱性环境及可反应的离子,高温煅烧能够改变原有物质的矿物结构,两种方式均可使再生微粉具备再水化胶凝的能力。高温热活化后,再生微粉的硅铝体结构发生重组或破坏,矿物中的基团在化学激发时更易溶出,参与反应形成胶凝产物,此时再生微粉的3、28 d抗压强度分别达到27.0、48.6 MPa,与原试件相比,强度值分别提高了10.3倍与5.8倍,耦合作用使再生微粉具有更高的活性及强度。

关键词: 废弃混凝土, 再生微粉, 化学激发, 热处理, 耦合作用

Abstract: In order to study the activation effect of chemical excitation, heat treatment and their coupling on recycled powder, the mechanical properties, mineral composition and reaction product types of recycled powder were studied by means of compressive strength test, X-ray diffraction test and infrared spectroscopy, etc. The results show that chemical excitation provides alkaline environment and reactive ions, and high temperature calcination changes the mineral structure of original material. Both methods make recycled powder have rehydrating and cementing ability. After high temperature thermal activation, the aluminosilicate structure of recycled powder is reorganized or destroyed. The groups in the mineral are more easily dissolved during chemical excitation to participate in the reaction to form cementitious products. At this time, the 3 and 28 d compressive strength of recycled powder reach 27.0 and 48.6 MPa, respectively, which increase by 10.3 times and 5.8 times compared with original specimen. The coupling effect makes recycled powder have higher activity and strength.

Key words: waste concrete, recycled powder, chemical excitation, heat treatment, coupling effect

中图分类号:

TU528

田青, 屈孟娇, 姚田帅, 祁帅, 王成, 阮梦月. 化学激发与热处理耦合作用对再生微粉的活性激发[J]. 硅酸盐通报, 2023, 42(4): 1400-1408.

TIAN Qing, QU Mengjiao, YAO Tianshuai, QI Shuai, WANG Cheng, RUAN Mengyue. Coupling Effect of Chemical Excitation and Heat Treatment on Active Excitation of Recycled Powder[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(4): 1400-1408.

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