Effects of Compound Admixtures on Hydration Characteristics of Ferrochrome Slag Based Composite Material
ZHOU Xintao1,3, HAO Xutao1, PENG Jinhui2,3, LUO Zhongqiu1
1 Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming 650500; 2 Faculty of Metallurgy and Energy Engineering, Kunming University of Science and Technology, Kunming 650093; 3 Key Laboratory of Unconventional Metallurgy, Ministry of Education, Kunning University of Science and Technology, Kunming 650093
Abstract: The phase composition, microstructure and morphology of hydration products of ferrochrome slag based composite material were characterized by means of X-ray analysis (XRD), thermogravimetry-differential scanning calorietry (TG-DSC) and scanning electron microscopy (SEM). The porosity of the composite material was determined by methanol method. The influence of compound admixtures on the hydration process of composite materials was researched. It was showed that the remarkable increase of early strength of the ferrochrome slag based composite material was attributed to the formation of much more hydration products such as ettringite and calcium silicate hydrate gel after adding compound admixtures. At later ages, secondary hydration reaction of ferrochrome slag, blast slag and fly ash was improved under the action of compound admixtures. The microstructure of composite material was more compact because a large amount of hydrate calcium silicate gel was formed to fill the void existed in the composite material.
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2017, Vol. 31 
