Effect of Superplasticizer Type and Dosage on early-Age Shrinkage of Portland Cement and Rice Husk Ash Pastes

Abstract:

In this work, the effect of superplasticizer type and dosage on early-age shrinkage of ordinary Portland cement (OPC) and rice husk ash paste (RHA) was investigated. The OPC and RHA pastes with a water/binder materials ratio (W/B) by weight of 0.22 and various dosages of polycarboxylate ether-based superplasticizers (PCE) and sulphonated naphthalene formaldehyde condensates (SNF) were investigated. RHA was partially substituted of 0%, 10% and 20 % by weight of OPC. Volumetric shrinkages of the pastes at the first 72 hours of hydration have been found to range from 0.28 to 12.26 mm3/g and from 0.20 to 9.04 mm3/g of binder materials for SNF-based and PCE-based superplasticizers, respectively. The PCE-based superplasticizer can decrease an increase in shrinkage of the OPC and RHA pastes higher than those of containing the SNF-based superplasticizer.

• Periodical: Advanced Materials Research (Volumes 450-451)
• Pages: 407-412
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.450-451.407
• Online since: January 2012
• Authors: Gritsada Sua-Iam, Natt Makul
• Keywords: Early-Age Shrinkage, Ordinary Portland Cement, Paste, Rice Husk Ash, Superplasticizer

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