Effects of nano-SiO2 and nano-CaCO3 on properties of ultra-high performance cementitious composites

被引：10

作者：

Rong, Zhidan ^{[1
]}

Jiang, Guang ^{[1
]}

Sun, Wei ^{[1
]}

机构：

[1] Jiangsu Key Laboratory of Construction Materials, Southeast University, Nanjing

来源：

Dongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Southeast University (Natural Science Edition) | 2015年 / 45卷 / 02期

关键词：

Microstructure; Nano-CaCO[!sub]3[!/sub; Nano-SiO[!sub]2[!/sub; Nanoindentation; Ultra-high performance cementitious composite;

D O I：

10.3969/j.issn.1001-0505.2015.02.034

中图分类号：

学科分类号：

摘要：

The effects of nano-SiO2 and nano-CaCO3 on the mechanical performance of ultra high performance cementitious composite (UHPCC) were studied. The hydration process and microstructure of UHPCC were investigated via hydration heat analysis method, XRD(X-ray diffraction), MIP(mercury intrusion porosimetry), nanoindentation and other analysis testing methods. The results indicate that the mechanical performance is improved by adding nano-SiO2 and nano-CaCO3. The optimal content of nano-CaCO3 is about 3% to 5%. With high chemical reactivity, nano-SiO2 promotes the early-age hydration process in cement, reacting with Ca(OH)2 to form C-S-H gel. The nano-CaCO3 phases may fill up void spaces and act as nucleation sites. As a result, the composites structure can be condensed significantly with the decrease of porosity and pore size. More hydrated products of UHPCC lead to formation of ultra high density(UHD) C-S-H which strengthens the interface zones. The UHPCC has excellent mechanical performance due to its compact microstructure. ©, 2015, Southeast University. All right reserved.

引用

页码：393 / 398

页数：5

共 18 条

[1]

Yoo D.Y., Shin H.O., Yang J.M., Et al., Material and bond properties of ultra high performance fiber reinforced concrete with micro steel fibers, Composites: Part B, 58, pp. 122-133, (2014)

[2]

Kang S.T., Kim J.K., The relation between fiber orientation and tensile behavior in an ultra high performance fiber reinforced cementitious composites (UHPFRCC), Cement and Concrete Research, 41, 10, pp. 1001-1014, (2011)

[3]

Wang C., Yang C.H., Liu F., Et al., Preparation of ultra-high performance concrete with common technology and materials, Cement and Concrete Composites, 34, 4, pp. 538-544, (2012)

[4]

Scrivener K.L., Kirkpatrick R.J., Innovation in use and research on cementitious material, Cement and Concrete Research, 38, 2, pp. 128-136, (2008)

[5]

Rong Z.D., Sun W., Xiao H.J., Et al., Effect of silica fume and fly ash on hydration and fly ash on hydration and microstructure evolution of cement based composites at low water-binder ratios, Construction and Building Materials, 51, pp. 446-450, (2014)

[6]

Ye Q., Research and development for nano-composite cement structure material, New Building Materials, 11, pp. 4-6, (2001)

[7]

Ye Q., Zhang Z., Kong D., Et al., Comparison of properties of high strength concrete with nano-SiO2 and silica fume added, Journal of Building Materials, 6, 4, pp. 381-385, (2003)

[8]

Ye Q., Zhang Z.N., Kong D.Y., Et al., Influence of nano-SiO2 addition on properties of hardened cement paste as compared with silica fume, Construction and Building Materials, 21, 3, pp. 539-545, (2007)

[9]

Bigley C., Greenwood P., Using silica to control bleed and segregation in self-compacting concrete, Concrete, 37, 2, pp. 43-45, (2003)

[10]

Chen R., Ye Q., Research on the comparison of properties of hardened cement paste between nano-SiO2 and silica fume added, Concrete, 1, pp. 7-10, (2002)

← 1 2 →