Abstract
The investigation focuses on evaluating the effect of varying % of Red Mud (RM) reinforcement with Ordinary Portland Slag Cement (OPSC). Characterisation is done by adding 10%, 20%, 30%, 40% and 50% of RM by weight to OPSC. RM + OPSC composite mortars are made in an 8.5 × 5 × 4 cm3 cast iron mould with external vibration keeping water-binder ratio 0.4 by weight. The mortars are cured in water for 28 days and their physio-chemical characteristics are investigated. Mortar performances like compressive strength, hardness, XRD, FTIR, SEM are diagnosed. The composite mortars cementing properties are compared with original OPSC. The result reveals the augmentation of RM with OPSC increases the hydration capacity of OPSC with improved compressive strength. The experimental optimization shows a maximum value up to 10% - 20% OPSC can be replaced by RM as filling material.
Highlights
For last several years it is observed that ground granulated blast furnace slag has been widely used as a partial replacement for Ordinary Portland Cement (OPC) for concrete manufacturing
As normal PSC/Ordinary Portland Slag Cement (OPSC) bear a compressive strength of 33 MPa after 28 days of curing
The results reveal an improved compressive strength up to 20% red mud reinforcement, might be due to improved hydration and structural properties approximating minimum air voids prevailing in the 20% Red Mud (RM) composite
Summary
For last several years it is observed that ground granulated blast furnace slag has been widely used as a partial replacement for Ordinary Portland Cement (OPC) for concrete manufacturing. Partial replacement of OPC by slag enhances certain physiological properties like reducing heat of hydration and corrosion risk [2]. Many constituents are responsible for hydration of ordinary Portland cement paste. The calcium silicate hydrate (C-S-H) phase is the primary product of OPC hydration [3]. The amount of combined water (bound) presented in OPC after hydration is dependent on phase composition of the original cement and on the degree of hydration [4]. Similar hydration products are found when OPC is partially replaced by slag [5]. The amount of Ca(OH) in OPC/slag composite is higher than that in OPC pastes
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