大掺量矿物掺合料对铝酸盐水泥浆体性能的影响

The Influence of High-volume Mineral Admixture on Performance of Calcium Aluminate Cement Paste

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关键词:

铝酸盐水泥;矿渣;粉煤灰;电阻率;化学收缩;海水;抗侵蚀性能

Key words:

Calcium Aluminate cement; Slag; Fly ash; Electrical resistivity; Chemical shrinkage; Seawater; Anti-erosion ability

刊期:

2019年第5期

DOI:

10.19761/j.1000-4637.2019.05.026.05

文章编号:

基金项目:

国家自然基金项目(51608402);长江科学院开放研究基金资助(CKWV2014211/KY)。

作者:

袁正夏,廖宜顺,沈 晴,陈 磊,廖国胜

单位:

武汉科技大学城市建设学院,430065

摘要

摘   要:研究了大掺量矿物掺合料与铝酸盐水泥复合浆体的抗压强度、电阻率、化学收缩和XRD的变化规律。结果表明,在淡水和海水环境下,一定量(40%以内)矿渣的掺入有利于促进铝酸盐水泥强度的发展,有效抑制了铝酸盐水泥后期强度倒缩;矿物掺合料可提高铝酸盐水泥抗海水侵蚀性能;铝酸盐水泥浆体的电阻率与化学收缩之间存在良好的相关性,水泥浆体的电阻率和化学收缩随着矿物掺合料掺量的增大而减小;在水化早期,矿渣和粉煤灰均未参与铝酸盐水泥的水化过程;矿渣在后期生成稳定的水化产物C2ASH8,其抑制晶相转变的效果较粉煤灰更为显著。
Abstract: The effect of high-volume mineral admixture on the compressive strength, electrical resistivity chemical shrinkage, XRD of calcium aluminate cement were investigated. The results show that the incorporation of a certain amount (within 40%) of slag is beneficial to promote the strength development and inhibit the late strength decreasing of calcium aluminate cement in freshwater and seawater environments. Adding mineral admixtures is an effective way to improve the corrosion resistance of aluminate cement in seawater. The belectrical resistivity and chemical shrinkage of aluminate cement paste exists a good correlation, the electrical resistivity and chemical shrinkage of cement paste decrease with the increase of mineral admixture. In the early stage of hydration, slag and fly ash are not participate in the hydration process of calcium aluminate cement. The slag promotes the formation of stable hydration product C2ASH8, therefore, it has better effect of inhibiting crystal phase transformation than fly ash. 

结论

(1)随着粉磨时间的延长,钒钛铁尾矿粉磨效率降低,30 min左右达到粉磨平衡,但比表面积随着粉磨时间延长持续增长,激光粒度分析中位粒径D50由20.1 μm降至12.4 μm。
(2)随着比表面积的增长,钒钛铁尾矿微粉活性提高较少,低于矿渣粉和粉煤灰活性指数,作为掺合料主要起微集料和充填的作用。
(3)尾矿微粉掺入量在45 kg以下时,对各龄期抗压强度影响不大,且60 d长龄期抗压强度增进量较基准配合比高。掺入量达到60 kg时,对混凝土强度影响较大,同时混凝土收缩率略有增加,抗冻融循环性能则显著提高。

参考文献

[1] 季馨婷,赵良,刘连文,等.基于CO2封存的盐酸浸取超贫钒钛磁铁矿尾矿实验研究[J].高校地质学报,2017,23(2):244-251.
[2] 郭毅霖.水泥基胶凝材料自收缩性能的研究[D].北京:北京工业大学,2006.

引用本文

袁正夏,廖宜顺,沈晴,等.大掺量矿物掺合料对铝酸盐水泥浆体性能的影响[J].混凝土与水泥制品,2019(5):26-30.

YUAN Z X,LIAO Y S,SHEN Q,et al.The Influence of High-volume Mineral Admixture on Performance of Calcium Aluminate Cement Paste[J].China Concrete and Cement Products,2019(5):26-30.


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