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Effect of modulus and dosage of waterglass on early age shrinkage of sodium silicate activated slag paste

Bahrami, H; Cheng, YP; Bai, Y; (2016) Effect of modulus and dosage of waterglass on early age shrinkage of sodium silicate activated slag paste. In: Proceedings of the International Workshop on Innovation in Low-carbon Cement & Concrete Technology. (pp. pp. 30-34). : London, UK. Green open access

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Abstract

In recent years, alkali-activated slag (AAS) as an alternative low-carbon emission and high strength cementitious material has received increased attention. However, high shrinkage and crack tendency of AAS limit its wider industrial applications. Although considerable researches have already been carried out on Portland cement (PC) based systems, the information and understanding on the early age shrinkage of AAS is still limited. On the other hand, early age shrinkage occurs mainly due to a high rate of water evaporation from the surface of fresh concrete. Therefore, this study seeks to explore the potential of two sodium silicate activated slag mixtures variables, namely, waterglass moduli and activator content, on moisture loss and early age shrinkage properties of AAS. A control AAS mix was formulated with water glass (silica modulus of 1.5) as an activator at the dosage of 4% (Na2O equivalent) by mass of slag and fixed waterbinder ratio (w/b) of 0.4. Two mixtures with modulus of 0.75 and activator dosage of 6% were compared in this study. The most significant findings to emerge from this study is that, AAS paste with moduli of 0.75 and activator content of 4% showed lower amount of early age shrinkage. However, further study still needs to be carried out in order to establish a better understanding of the current results.

Type: Proceedings paper
Title: Effect of modulus and dosage of waterglass on early age shrinkage of sodium silicate activated slag paste
Event: International Workshop on Innovation in Low-carbon Cement & Concrete Technology - 2016
Location: London, UK
Dates: 21 September 2016 - 24 September 2016
Open access status: An open access version is available from UCL Discovery
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Alkali-activated slag, Early age shrinkage, Cement Paste, Sodium Silicate, Evaporation
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng
URI: https://discovery.ucl.ac.uk/id/eprint/1523347
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