Effect of a Modified SAF on Aluminate Hydration of Cement

H. Y. Wu, Y. Q. Jiang, Y. Wang

Abstract

Sulfonated acetone formaldehyde (SAF) condensate type high range water reducer was modified by grafting with lignosulfonate for the sake of mitigation bleeding of concrete. Effect of the modified SAF (MSAF) on assemblage of aluminate hydrates in hardened cement paste was investigated by XRD and SEM. Experimental results indicated that the MSAF inhibits the hydration progress of C3A, reduces the intercalation between superplasticizer molecules and aluminate hydrates and changes the dissolution-precipitation process of limestone filler blend cement. Reaction between C3A and calcite is controlled by MSAF. Consequently, monosulfoaluminate was still observed in the paste containing limestone filler hydrated for 28 days, which was comparable with hydrates in control and polynaphthalene sulphonate (PNS) dispersed pastes. Different in aluminate hydrates explains why MSAF or MSAF-maleic type polycarboxylate admixture (MSAF-PCA) combined superplasticizer is more compatible with cements containing limestone filler than PNS.

Download


Paper Citation


in Harvard Style

Wu H., Jiang Y. and Wang Y. (2018). Effect of a Modified SAF on Aluminate Hydration of Cement.In Proceedings of the International Workshop on Materials, Chemistry and Engineering - Volume 1: IWMCE, ISBN 978-989-758-346-9, pages 378-385. DOI: 10.5220/0007439103780385


in Bibtex Style

@conference{iwmce18,
author={H. Y. Wu and Y. Q. Jiang and Y. Wang},
title={Effect of a Modified SAF on Aluminate Hydration of Cement},
booktitle={Proceedings of the International Workshop on Materials, Chemistry and Engineering - Volume 1: IWMCE,},
year={2018},
pages={378-385},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0007439103780385},
isbn={978-989-758-346-9},
}


in EndNote Style

TY - CONF

JO - Proceedings of the International Workshop on Materials, Chemistry and Engineering - Volume 1: IWMCE,
TI - Effect of a Modified SAF on Aluminate Hydration of Cement
SN - 978-989-758-346-9
AU - Wu H.
AU - Jiang Y.
AU - Wang Y.
PY - 2018
SP - 378
EP - 385
DO - 10.5220/0007439103780385