Materiales de Construcción, Vol 68, No 330 (2018)

A composite cement of high magnesium sulphate resistance


https://doi.org/10.3989/mc.2018.11316

A. Allahverdi
Research laboratory of Inorganic Chemical Process Technologies, School of Chemical Engineering, Iran University of Science and Technology - Cement Research Center, Iran University of Science and Technology, Iran, Islamic Republic of
orcid http://orcid.org/0000-0002-8988-9226

M. Akhondi
Research laboratory of Inorganic Chemical Process Technologies, School of Chemical Engineering, Iran University of Science and Technology, Iran, Islamic Republic of
orcid http://orcid.org/0000-0001-6723-6024

M. Mahinroosta
Research laboratory of Inorganic Chemical Process Technologies, School of Chemical Engineering, Iran University of Science and Technology, Iran, Islamic Republic of
orcid http://orcid.org/0000-0001-9709-2949

Abstract


This study investigates the magnesium sulphate resistance of chemically activated phosphorus slag-based composite cement (CAPSCC). Enough mortar specimens were prepared from phosphorus slag (80 wt.%), type II Portland cement (14 wt.%), and compound chemical activator (6 wt.%) and were exposed to 5% magnesium sulphate solution after being cured. Mortar specimens of both type II and V Portland cements (PC2 and PC5) were also prepared and used for comparison purpose. According to the test results, after 12 months of exposure, PC2, PC5 and CAPSCC exhibited 43.5, 35.2 and 25.2% reduction in compressive strength, 0.136, 0.110, and 0.026% expansion in length, and 0.91, 2.2, and 1.78% change in weight, respectively. Complementary studies by X-ray diffractometry and scanning electron microscopy revealed that CAPSCC has a very low potential for the formation of sulphate attack products, especially ettringite. The results confirm a high magnesium sulphate resistance for CAPSCC compared to PC2 and PC5.

Keywords


Composite; Blended cement; Sulphate-resistant cement; Sulphate attack; Compressive strength

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References


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