混凝土用生物炭火山灰活性研究综述

doi:10.16552/j.cnki.issn1001-1625.2024.1556

摘要/Abstract

摘要： 生物炭是一种生态的负碳材料,将其适量添入混凝土,可以提高混凝土的力学性能和耐久性,但生物炭能否作为混凝土用火山灰质材料及生物炭是否具有火山灰活性尚存在争议。对此,本文对生物炭火山灰活性、生物炭对混凝土力学性能影响及生物炭火山灰活性提高措施等方面进行了文献调研和综述分析。结果表明:生物炭具有火山灰活性,且其火山灰活性不受烧失量影响,而活性SiO₂含量是生物炭火山灰活性的决定因素;高的生物炭火山灰活性可以促进火山灰反应和水化反应,对混凝土抗压强度产生有利影响;控制热解温度和磨细处理有助于提高生物炭的火山灰活性,但活化处理对生物炭火山灰活性影响还需深入研究。

关键词: 生物炭, 混凝土, 农林固废, 生物质材料, 火山灰活性, 力学性能

Abstract: Biochar is an ecological carbon-negative material. Adding an appropriate amount of biochar to concrete can improve the mechanical properties and durability of concrete. However, there are still controversies over whether biochar can be used as a pozzolanic material for concrete and whether biochar has pozzolanic activity. In response to this, this paper conducts a literature review and comprehensive analysis on aspects such as the pozzolanic activity of biochar, the impact of biochar on the mechanical properties of concrete, and measures to improve the pozzolanic activity of biochar. The results show that biochar has pozzolanic activity, and its pozzolanic activity is not affected by the loss on ignition, while the reactive SiO₂ content is the decisive factor for the pozzolanic activity of biochar. The high pozzolanic activity of biochar can promote the pozzolanic reaction and hydration reaction, which is beneficial to the compressive strength of concrete. Controlling the pyrolysis temperature and fine grinding treatment can help to improve the pozzolanic activity of biochar, but the impact of activation treatment on the pozzolanic activity of biochar still requires in-depth research.

Key words: biochar, concrete, agriculture solid waste, biomass material, pozzolanic activity, mechanical property

中图分类号:

TU528

余沁昕, 刘问. 混凝土用生物炭火山灰活性研究综述[J]. 硅酸盐通报, 2025, 44(4): 1243-1254.

YU Qinxin, LIU Wen. Pozzolanic Activity of Biochar Used in Concrete: a Review[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(4): 1243-1254.

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