Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/8566
Title: Effects of nano-TiO2 on strength, shrinkage and microstructure of alkali activated slag pastes
Authors: Yang, LY
Jia, ZJ
Zhang, YM
Dai, JG 
Keywords: Alkali activated slag
Microstructure
Shrinkage
Strength
TiO2
Issue Date: 2015
Publisher: Pergamon Press
Source: Cement and concrete composites, 2015, v. 57, p. 1-7 How to cite?
Journal: Cement and concrete composites 
Abstract: For alkali-activated slag (AAS), high drying shrinkage is an obstacle which impedes its application as a construction material. In this investigation, nano-TiO2 was added to AAS, and its mechanical properties and shrinkage were tested to examine its effect on hardened alkali-activated slag paste (AASP). To understand the impact of nano-TiO2 on AASP at micro scale, FTIR, MIP and SEM were carried out. Experimental results indicate that the addition of nano-TiO2 to AAS enhances the mechanical strength, and decreases the shrinkage of AASP. FTIR and SEM results demonstrated that the addition of nano-TiO2 into the AASP accelerates its hydration process, resulting in more hydration products and denser structure. MIP results showed that the addition of nano-TiO2 reduces the total porosity of AASP and changes the pore structure. The porosity of 1.25-25 nm mesopores, which is believed to be responsible for the high shrinkage of AASP, is remarkably reduced due to the addition of nano-TiO2.
URI: http://hdl.handle.net/10397/8566
ISSN: 0958-9465
EISSN: 1873-393X
DOI: 10.1016/j.cemconcomp.2014.11.009
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