EFFECT OF TYPES OF SUPERPLASTICIZER ON PROPERTIES OF PASTE AND MORTAR MADE WITH A BINDER OF BOTTOM ASH AND CALCIUM CARBIDE RESIDUE

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Title: EFFECT OF TYPES OF SUPERPLASTICIZER ON PROPERTIES OF PASTE AND MORTAR MADE WITH A BINDER OF BOTTOM ASH AND CALCIUM CARBIDE RESIDUE

Author(s): Akaddej AbdulMattin, Veerachart Tangjirat, Chatchanapurpitakul

Publication: TCA

Volume: 3

Issue: 1

Appears on pages(s): 30-40

Keywords: Binder, bottom ash, calcium carbide residue, pozzolan, superplasticizer

Date: 1/1/2015

Abstract:
This research investigated the effect of melamine sulphonate (MS) and polycarboxylate (PC) superplasticizers on properties of paste and mortar using ground bottom ash (GBA) mixed with ground calcium carbide residue (GCR) as a binder. The optimum proportion between GBA:GCR was determined and it was found that the optimum proportion was 70:30 by weight to obtain the highest compressive strength. The effects of MS and PC superplasticizers on normal consistency and setting times of GBA-GCR pastes and compressive strengths of GBA-GCR mortars were investigated. The results showed that at the same dosage, PC superplasticizer could decrease more effectively the water demand at normal consistency than MS superplasticizer. The setting times of GBA-GCR pastes were between 235 to 390 min. However, the setting time of paste was shorter with the increased of PC superplasticizer dosage between 0.2 to 1.0% by weight of binder. With 0.2% by weight of binder, MS superplasticizer could reduce the setting time of paste but the setting time tended to increase with the increased of MS superplasticizer dosage from 0.5% to 1.0% by weight of binder. The highest compressive strength of GBA-GCR mortar at 90 days was 206 ksc. In addition, the mortar containing PC superplasticizer had higher compressive strength than that of mortar containing MS superplasticizer, especially at a low water to binder ratio (w/b ratio of 0.45) of mortar. As the results, GBA and GCR can be used as a new binder and the workability of the binder could be improved by using superplasticizer. Moreover, use of PC superplasticizer could decrease setting times of paste and gave better compressive strength of mortar than that with MS superplasticizer. Moreover, there was little or no significant difference for the cost of using both superplasticizers when the w/b ratio and flow of both mortars were kept the same.


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