Effects of Nano-CaCO3/Limestone Composite Particles on the Hydration Products and Pore Structure of Cementitious Materials
Effects of Nano-CaCO3/Limestone Composite Particles on the Hydration Products and Pore Structure of Cementitious Materials
复制标题
纳米CaCO3/石灰石复合颗粒对胶凝材料水化产物及孔结构的影响
DOI：
10.1155/2018/5732352
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发表时间：
2018-02
影响因子：
--
通讯作者：
车玉君
中科院分区：
文献类型：
--
作者：
杨华山;车玉君
纳米CaCO3(NC)的团聚是其在胶凝材料中应用的最大瓶颈。如果纳米CaCO3对微米级石灰石粉末(LS)进行表面改性，则会形成纳米CaCO3/石灰石复合粒子(NC/LS)。众所周知，微米级石灰石很容易分散，而NC的“分散”受LS的“分散”支配。因此，纳米CaCO3在胶凝材料中的分散性可以通过NC/LS来改善。在本工作中，利用Ca(OH)2-H2O-CO2反应体系在三颈烧瓶中进行了NC/LS的制备。用场发射扫描电子显微镜(FE-SEM)观察了NC/LS复合材料的形态。研究了NC/LS对胶凝材料水化产物和孔结构的影响。在水泥净浆和砂浆中掺入5%的NC/LS，在一定龄期测试试件的力学性能。采用差示扫描量热分析(DSC)、热重分析(TG)、背散射电子成像(BSE)等测试手段对水化产物和孔结构进行了分析。比较了使用NC/LS的试件和不使用NC/LS的对照试件的性能。结果表明，NC/LS降低了胶凝材料的孔隙率，提高了材料的力学性能。
The agglomeration of nano-CaCO3 (NC) is the largest bottleneck in applications in cementitious materials. If nano-CaCO3 modifies the surface of micron-scale limestone powder (LS), then it will form nano-CaCO3/limestone composite particles (NC/LS). It is known that micron-scale limestone is easily dispersed, and the “dispersion” of NC is governed by that of LS. Therefore, the dispersion of nano-CaCO3 can be improved by the NC/LS in cementitious materials. In this work, the preparation of NC/LS was carried out in a three-necked flask using the Ca(OH)2-H2O-CO2 reaction system. The morphology of NC/LS was observed by a field emission scanning electron microscope (FE-SEM). The effects of NC/LS on the hydration products and pore structure of cementitious materials are proposed. 5% NC/LS was added into cement paste and mortar, and the mechanical properties of the specimens were measured at a certain age. Differential scanning calorimetry (DSC), thermal gravimetric analysis (TG), and backscattered electron imaging (BSE) were conducted on the specimens to investigate the hydration products and pore structure. The properties of specimens with NC/LS were compared to that of control specimens (without NC/LS). The results revealed that NC/LS reduced the porosity and improved the mechanical properties of the cementitious materials.
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影响因子：
3.8
作者：
Kawashima, Shiho;Seo, Jung-Woo Ted;Shah, Surendra P.
通讯作者：
Shah, Surendra P.
DOI：
--
发表时间：
2001-03
期刊：
Concrete international
影响因子：
--
作者：
P. K. Mehta;R. W. Burrows
通讯作者：
P. K. Mehta;R. W. Burrows
DOI：
10.4028/www.scientific.net/kem.703.354
发表时间：
2016-08
期刊：
Key Engineering Materials
影响因子：
--
作者：
Huashan Yang;Y. Che;Man-Yu Zhang
通讯作者：
Huashan Yang;Y. Che;Man-Yu Zhang
影响因子：
2
作者：
J. Makar;J. Beaudoin;K. Trischuk;G. Chan;Faroan Torres
通讯作者：
J. Makar;J. Beaudoin;K. Trischuk;G. Chan;Faroan Torres
影响因子：
11.4
作者：
Heikal, M;El-Didamony, H;Morsy, MS
通讯作者：
Morsy, MS