Comparison of Hydration Properties of Cement‐Carbon Steel Slag and Cement‐Stainless Steel Slag Blended Binder

Abstract

This article investigates the effect of carbon steel slag (CS) and stainless steel slag (SS) on the hydration of cement (OPC). Two slags were used to replace cement at a replacement ratio of 15% (CS15 and SS15) and 30% (CS30 and SS30), respectively, by binder weight. Test results demonstrated that the hydration rate of OPC-CS binder is similar to that of OPC-SS binder at 3 days but higher than the latter at later ages. The negative effect of steel slag (CS) on the strength of cement mortar can be neglected when its replacement ratio does not exceed 15%. X-ray diffraction (XRD) and thermogravimetry (TG) show that the incorporation of SS tends to decrease calcium hydroxide (CH) content more than the incorporation of CS in the cement matrix. BSE (backscattered electron)/EDX (energy-dispersive X-ray spectroscopy) analyses estimate the average Si/Ca ratio of CS30 and SS30 at 90 days to be 0.41(Ca/Si = 2.44) and 0.45(Ca/Si = 2.22), respectively, compared to 0.43 (Ca/Si = 2.33) for pure cement.

Comparative Analysis on the Mechanical Properties, Transportation Cost, and Carbon Footprint Emission of Cement Mortar with PE and SSRS as Partial Replacement for Aggregates

“…In a typical cement mortar specimen with pure cement, the amount of calcium hydroxide (Ca(OH)2) is expected to increase with curing age and is proportional to the amount of cement. For cement mortar specimens substituted with SSRS, it is expected that the amount of Ca(OH)2 decreases with increasing substitution amount of SRSS due to the following: (1) SSRS consumes the Ca(OH)2 via pozzolanic reaction and (2) dilution of cement by SSRS [46]. Thus, resulting in poor strength as evidenced by the decreased compressive strength values.…”

“…Increasing the amount of PE plastic aggregates in the sample resulted in higher water absorption. Plastic aggregates have very minimal water absorption capacity which results in water accumulation in the interfacial transition zone resulting in more porous cement mortar samples [46]. Meanwhile, increasing the w/c ratio from 0.4 to 0.6 also resulted in higher water absorption since a higher w/c ratio enhanced the formation of porosity in the cement mortar sample.…”

A Novel Eco-Friendly Thermal-Insulating High-Performance Geopolymer Concrete Containing Calcium Oxide-Activated Materials from Waste Tires and Waste Polyethylene Terephthalate

“…In a typical cement mortar specimen with pure cement, the amount of calcium hydroxide (Ca(OH) 2 ) is expected to increase with curing age and is proportional to the amount of cement. For cement mortar specimens substituted with SSRS, it is expected that the amount of Ca(OH) 2 decreases with an increasing substitution amount of SRSS due to the following: (1) the consumption of the Ca(OH) 2 by SSRS via a pozzolanic reaction and (2) the dilution of cement by SSRS [61]. Thus, this results in poor strength as evidenced by the decreased compressive strength values.…”

Preparation and Mechanism Analysis of Stainless Steel AOD Slag Mixture Base Materials

“…It is conducive to collection and processing and has reasonable prospects for recycling in concrete engineering and road engineering. In an earlier study, Rosales et al [ 7 ] analyzed the composition of AOD slag and found that its composition was similar to ordinary Portland cement and that it had certain cementitious activity [ 8 , 9 , 10 ]. Adegoloye et al [ 11 , 12 ] used AOD slag instead of natural aggregate in concrete and found that it can slightly improve the mechanical properties of concrete.…”