Abstract
Supplementary cementitious materials (SCMs) such as fly ash, silica fume, and waste glass powder (WGP) are widely used in concrete to reduce the emission of carbon dioxide and improve mechanical properties. Superplasticizers are added to ensure the workability of concrete, however, the effect of its type and dosage are very influential factors when concrete incorporates SCMs. Therefore, this study tries to fill the research gap and gain complete knowledge about the influence of a supplementary cementitious material, waste glass powder (WGP), on the compatibility of polynaphthalene sulfonate (PNS) or polycarboxylate (PC) based superplasticizers and ordinary Portland cement (OPC). Different blended cement mixtures are prepared and their standard water consistency and setting time is evaluated. The effect of waste glass powder content in the blended cement on the compatibility is studied through mini-slump test, zeta potential measurements and the mass of superplasticizers adsorbed on the surface of binder particles using total organic carbon (TOC) measurements.The results revealed that the presence of WGP has a great effect on the flowability and flowability retention time when PNS or PC were used as a superplasticizer. The adsorption behavior of both superplasticizers was altered where the amount of PNS adsorbed on the cement particles increased while that of PC decreased by increasing the percentage of incorporated WGP. The absolute zeta potential is significantly increased (in negative value) with the addition of PNS, but approximately not changed with the addition of PC. The change in adsorption behavior and the zeta potential measurement explained the compatibility of both superplasticizers with blended cement.
Published Version
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