天然火山灰混凝土抗碳化性能试验研究

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摘要研究目的：以天然火山灰混凝土为研究对象，通过加速碳化试验与差热分析试验对未掺加矿物掺合料的基准混凝土、火山灰混凝土及粉煤灰混凝土的抗碳化性能进行对比分析,并研究掺加少量硅灰对火山灰混凝土抗碳化性能的改善效果,为实际工程提供技术指导。
研究结论：（1)与基准混凝土相比，由于水泥孰料减少和二次水化消耗的双重作用,火山灰混凝土和粉煤灰混凝土中的Ca(OH)的含量少，抗碳化性能显著降低；（2)同掺量的粉煤灰混凝土与火山灰混凝土相比，粉煤灰混凝土抗碳化性能优于火山灰混凝土;（3)掺加硅灰的火山灰混凝土的抗碳化性能明显提高，掺加5%硅灰的火山灰混凝土甚至优于粉煤灰混凝土,可以代替粉煤灰混凝土使用；（4)差热分析试验从机理上验证和分析了宏观试验结果;（5)对于天然火山灰资源丰富地区的混凝土工程，该研究成果可以促进地方资源的有效利用,为实际工程带来环境和经济效益。

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	崔圣爱
	刘品
	沈彬然

关键词 ：天然火山灰混凝土, 抗碳化性能, 加速碳化, 差热分析, 硅灰

Abstract：Research purposes ： Taking natural pozzolanic concrete as the study object, this paper carries out a comparative analysis on the carbonation resistance of basic concrete (no mineral admixture) , pozzolanic concrete and fly ash concrete through accelerated carbonation test and differential thermal analysis. It also studies the improvement effect of adding few silica fumes on the carbonation resistance of pozzolanic concrete. The experimental study can provide technical guidance for actual engineering.
Research conclusions: (1) Under the dual effect of reduction of cement clinker and consumption of secondary hydration, the contents of Ca ( OH) 2 in pozzolanic concrete and fly ash concrete both decrease, so the carbonation resistance remarkably declines compared with that of basic concrete. (2) Under the same amount of admixture, comparing the fly ash concrete with the pozzolanic concrete, the carbonation resistance of the former is better than the latter. (3 ) The carbonation resistance of pozzolanic concrete mixed with silica fume increases significantly. The pozzolanic concrete mixed with 5% of silica fume, is even better than the fly ash concrete. Therefore, in terms of carbonation resistance, the fly ash concrete can be replaced by pozzolanic concrete mixed with 5% of silica fume.(4) The macroscopic experimental results are validated and analyzed by differential thermal analysis experiment.(5) For concrete engineering with rich natural volcanic ash resources, the research resutlts can stimulate the effective utilization of local resources, and bring the environmental benefits and economic benefits for actual engineering.

Key words： natural pozzolanic concrete carbonation resistance property accelerated carbonation differential thermal analysis silica fume

收稿日期: 2015-06-08

作者简介: 崔圣爰，1981年出生，女，副教授。

引用本文:

崔圣爱,刘品,沈彬然. 天然火山灰混凝土抗碳化性能试验研究[J]. 铁道工程学报, 2015, 32(9): 97-102.
CUI Sheng - ai，LIU Pin, SHEN Bin - ran. Experimental Research on the Carbonation Resistance of Natural Pozzolanic Concrete. Journal of Railway Engineering Society, 2015, 32(9): 97-102.

链接本文:

https://tdgcxb.crec.cn/CN/ 或 https://tdgcxb.crec.cn/CN/Y2015/V32/I9/97

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