Action Time-Effect and Mechanism of Low-Calcium Fly Ash in Cement-Based Composites
Action Time-Effect and Mechanism of Low-Calcium Fly Ash in Cement-Based Composites
复制标题
低钙粉煤灰在水泥基复合材料中的作用时效及机理
DOI：
10.3390/cryst11060681
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发表时间：
2021-06
期刊：
影响因子：
2.7
通讯作者：
Sun Guowen
中科院分区：
文献类型：
--
作者：
Yan Na;Tang Qingqing;Zhang Ying;Sun Guowen
本研究旨在探讨低钙粉煤灰何时发挥物理或化学效应，以及低钙粉煤灰的化学效应比例。以细度相近的低钙粉煤灰和石英粉作为活性掺合料和惰性掺合料，研究了两种低钙粉煤灰和石英粉的掺合料性能。在不同水胶比和水化龄期条件下，研究了不同掺合料种类和掺量对复合材料抗折强度和抗压强度的影响。采用X射线衍射（XRD）、扫描电子显微镜（SEM）和氮气吸附法对粉煤灰的水化程度进行了评价，并对不同龄期的水化产物、水化产物的微观结构、比表面积和孔径分布进行了观察。结果表明，在28 d的水化期内，低钙粉煤灰具有微集料填充的物理效应。但56天后，粉煤灰的水化程度开始超过1%。说明低钙粉煤灰既具有火山灰活性效应，又具有微集料填充效应。相比之下，水化90天的低钙粉煤灰仍以物理填充效应为主。
This study was conducted in order to investigate when low-calcium fly ash plays a physical or chemical effect and what is the chemical effect proportion of low-calcium fly ash. Two types of low-calcium fly ash and quartz powder, with similar fineness as active and inert admixtures, were used as materials in this study. Under different water/binder ratios and hydration ages, the effects of the different types of admixtures and their dosages on the flexural and compressive strength of the composites were studied. X-ray diffraction (XRD), scanning electron microscopy (SEM) and nitrogen adsorption methods, in addition to an assessment of the degree of hydration of the fly ash, were employed to observe the hydration products at different ages, the microstructures of the hydration products, as well as their surface areas and pore size distributions. The results show that during the hydration period of 28 days, the low-calcium fly ash has a micro-aggregate filling physical effect. However, after 56 days, the hydration degree of fly ash begins to exceed 1%. This illustrates that the low-calcium fly ash has both the pozzolanic activity effect and micro-aggregate filling effect. In contrast, the low-calcium fly ash hydrated for 90 days is still dominated by the physical filling effect.
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影响因子：
11.4
作者：
Wang, AQ;Zhang, CZ;Sun, W
通讯作者：
Sun, W
DOI：
10.1515/secm-2012-0052
发表时间：
2012-12
期刊：
--
影响因子：
--
作者：
M. Jalal;E. Mansouri
通讯作者：
M. Jalal;E. Mansouri
影响因子：
7.7
作者：
P. K. Mandal;A. Bandyopadhyay
通讯作者：
P. K. Mandal;A. Bandyopadhyay
DOI：
10.4028/www.scientific.net/msf.675-677.551
发表时间：
2011-02
期刊：
Materials Science Forum
影响因子：
--
作者：
Zhongtao Luo;B. Ma;J. Yang;X. Li
通讯作者：
Zhongtao Luo;B. Ma;J. Yang;X. Li
影响因子：
7.4
作者：
Q. Zeng;Kefei Li;T. Fen-Chong;P. Dangla
通讯作者：
Q. Zeng;Kefei Li;T. Fen-Chong;P. Dangla