Pulp White Liquor Waste as a Cement Admixture-Part I

H. H. M. Darweesh^1, and M. G. El-Meligy²

¹Refractories, Ceramics and Building Materials Dept. National Research Centre, Cairo, Egypt

²Cellulose and Paper Dept., National Research Centre, Cairo, Egypt

Cite this paper:
H. H. M. Darweesh and M. G. El-Meligy. Pulp White Liquor Waste as a Cement Admixture-Part I. American Journal of Mining and Metallurgy. 2014; 2(4):88-93. doi: 10.12691/ajmm-2-4-5

Abstract

The pulp white liquor waste (PWL), a byproduct from paper-making, could be applied as a cement admixture in two types of cement, namely Ordinary Portland cement (OPC) and Portland limestone cement (LPC). The results showed that the water of consistency of cement pastes premixed with 0, 1, 2 and 3 wt. % PWL was gradually decreased, while the setting times (initial and final) were increased. So, it can be used as a retarder. The compressive strength increased slightly during the early ages of hydration (1 and 3 days), but sharply increased during the later ages (28 and 90 days), specially with those premixed with PWL. The combined water content and bulk density displayed the same trend as the compressive strength, whilst the apparent porosity decreased at all curing times up to 90 days. The IR spectra of cement pastes showed that the intensities of the different peaks of cement pastes with PWL are higher than those of the pure samples. The above results proved that 2 wt. % PWL is the optimum concentration.

Keywords:
PWL OPC LPC combined water bulk density apparent porosity Strength FT-IR

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