Abstract
The properties of blended cement containing 0%, 20%, and 50% iron tailing powder (ITP) at 20 °C and 60 °C were investigated by determining the hydration heat, microstructure, and compressive strength. The addition of ITP decreases the exothermic rate and cumulative hydration heat of blended cement at 20 °C. The high temperature increases the hydration rate and leads to the hydration heat of blended cement containing 20% ITP higher than that of Portland cement. Increasing the amount of ITP decreases the non-evaporable water content and Ca(OH)2 content as well as compressive strength at both of the two studied temperatures. The addition of ITP coarsens the early-age pore structure but improves the later-age pore structure at 20 °C. The high temperature significantly improves the early-age properties of blended cement containing ITP, but it is detrimental to the later-age properties development. The reaction of ITP is limited even at high temperature. The large ITP particles bond poorly with surrounding hydration products under early high-temperature curing condition. The properties of blended cement containing a large amount of ITP are much poorer at high temperature.
Highlights
In order to meet the rapid development of society, many iron ores are mined in China
The findings indicate that the addition of a small quantity of iron tailing powder (ITP) does not affect the hydration of cement before the deceleration period at 20 ◦C
Note that the exothermic rate of the blended cement containing 20% ITP is higher in the induction period and the initial acceleration period compared with Portland cement
Summary
In order to meet the rapid development of society, many iron ores are mined in China. A considerable amount of iron tailings are discharged while extracting useful metals. The common method to deal with iron tailings is stockpiling, which has caused land occupation and surface subsidence as well as environmental pollution [1,2,3]. It is urgent to find an efficient way to improve the utilization rate of iron tailings. The main chemical compositions of iron tailings are SiO2, Al2O3, Fe2O3, CaO, and MgO [4]. Iron tailings show the same kind of chemical compositions as that of Portland cement. Iron tailings can be used in the concrete industry
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