Effects of hydroxyethyl cellulose and oxalic acid on the properties of cement

Summary

The effects of hydroxyethyl cellulose (HEC), oxalic acid and their binary mixtures {1:1, 1:2, 1:3 and 1:4 (by weight)} on the properties of ordinary Portland cement were studied using up to 4% admixtures. Variations in setting time, heat of hydration, strength, hardness and fracture toughness were determined.  FT-IR and XRD were used to determine the phase compositions of the material.  Corrosion  resistance against H2SO4, HCl and seawater was studied by determining the weight loss of cement mortars.  It was found  that HEC acts as a retarder and oxalic acid as an accelerator.  The binary mixture (1:3) increased the heat of  hydration, strength, hardness, fracture toughness and corrosion resistance.  Interaction between HEC, oxalic acid and cement hydration products takes place, and new phases are formed in the presence of water, leading to the formation of stronger bonds and pore sealing in the resulting product.  This decreases the water absorption compared to OPC.  31 refs.

Primary author(s): Singh N K; Mishra P C; Singh V K; Narang K K

                            Banaras Hindu University

Source: Cem.Concr.Res.

            33,No.9,2003,p.1319-1329


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