High volume fly ash mortar containing nano-calcium carbonate as a sustainable cementitious material: microstructure and strength development

被引：29

作者：

Yang, Huashan ^{[1
]}

Che, Yujun ^{[1
]}

Leng, Faguang ^{[2
]}

机构：

[1] Guizhou Normal Univ, Sch Mat & Architecture Engn, Guiyang, Guizhou, Peoples R China

[2] China Acad Bldg Res, Beijing 100013, Peoples R China

来源：

SCIENTIFIC REPORTS | 2018年 / 8卷

基金：

中国国家自然科学基金;

关键词：

MECHANICAL-PROPERTIES; COMPRESSIVE STRENGTH; LIMESTONE; CONCRETE; HYDRATION; NANO-CACO3; DURABILITY; METAKAOLIN; SILICA;

D O I：

10.1038/s41598-018-34851-4

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The mechanisms underlying the effects of nano-calcium carbonate (NC) on the strength of high volume fly ash (FA) mortar are discussed. Two NCs are used as 2%, 4%, 6%, and 8% by weight of cementitious materials. Hydrated products of fly ash mortar containing NC was investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetric analysis (TG) and differential thermal gravity (DTG) analysis. Results indicate that NC could improve strength of FA mortar due to the more rapid growth of hydrated products induced by NC through additional nucleation sites. Corresponding to the highest measured strength of FA mortar, the optimal contents of NC are around 2%. In addition, the presence of 2% NC improved the microstructure of FA mortar after 180 days due to the formation of calcium carbonaluminate hydrate.

引用

页数：11

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