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Properties of Steel Slag and Stainless Steel Slag as Cement Replacement Materials:A Comparative Study

Journal of Wuhan University of Technology(Materials Science) 2018年第6期33卷 1444-1451页

作者： saly fathy GUO Liping MA Rui GU Chunping SUN Wei School of Material Science and Engineering Southeast UniversityNanjing 211189China Collaborative Innovation Center for Ad-vanced Civil Engineering Materials Nanjing 211189China Jiangsu Key Laboratory of Construction Materials Nanjing 211189China College of Civil Engineering and Architecture Zhejiang University of TechnologyHangzhou 310014China

To enhance the understanding about the utilization of steel slags as a cementitious material, we comparatively studied the chemical, mineralogical and morphological properties of two types of steel slag; basicoxygen-furnace carbon slag(BOF C) and electric-arc-furnace stainless steel slag(EAF S). Moreover, we studied the standard consistency, setting time and the effect of the slag replacement ratios on the fluidity and compressive strength of blended cement mortar. The experimental results showed that BOF C had higher alkalinity, higher pH value and more hydraulic phases than EAF S. Both types of slag showed water reduction effect due to its high fineness. Neat BOF C paste showed flash set and acceleration in the initial setting time of blended cement especially at high slag proportions. However, EAF S prolonged the setting time of blended cement even at low slag proportions. The pH values for blended cement contained 50% BOF C or EAF S were lower than those of pure cement paste. Despite of slag type, compressive strength gradually decreased with increasing slags content. The strength of BOF C mortar was higher than that of EAF S mortar with the same replacement ratio for the same age. Slag activity index demonstrated that BOF C and EAF S conformed to the Chinese National Standard(GB/T 20491-2006) requirements for steel slag as grade one and grade two, respectively.

关键词： steel slag stainless steel slag fluidity setting time compressive strength activity index

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Influence of different curing regimes on the microstructure and macro performance of UHPFRCC

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Journal of Southeast University(English Edition) 2014年第3期30卷 348-352页

作者： saly fathy 孙伟东南大学材料科学与工程学院南京211189

This study investigates the influence of different curing regimes on the microstructure and macro properties of ultra-high performance fiber reinforced cementitious composite （UHPFRCC）, and aims to discover whether it is possible to produce qualified UHPFRCC using different curing regimes. A control mix of UHPFRCC is prepared. The mechanical performance and the short-term durability of the UHPFRCC matrix under three curing regimes are studied. In addition, the microstructures of the UHPFRCC matrix with different curing conditions are analyzed by combining scanning electron microscopy （SEM） and mercury intrusion porosimetry （MIP）. The results explore how different UHPFRCC curing regimes affect its microstructure and how the microstructure affects its macro behavior. Heat and steam curing for 3 d is succeeded to produce the UHPFRCC with nearly the same mechanical properties and durability as those of the 90 d standard curing. However, the heat cured UHPFRCC does not show great resistance to chloride-ion penetration.

关键词： ultra-high performance fiber reinforcedcementitious composite (UHPFRCC) curing regimes durability microstructure

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维普期刊数据库

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Main properties of ultra-high performance fiber reinforced cement composites under couple effect of load and environment

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Journal of Southeast University(English Edition) 2012年第2期28卷 184-189页

作者： saly fathy 顾春平孙伟东南大学材料科学与工程学院南京211189 Department of Civil Engineering Alexandria UniversityAlexandria 21532Egypt

This study aims to reveal the mechanism that how the content of steel fibers and strength grades affect the macro performance of the ultra-high performance fiber reinforced cementitious composite （UHPFRCC） and to study the UHPFRCC durability under the combined effect of loads and environments. Three types of high and ultra-high performance fiber reinforced cement composites with different strength grades （100, 150, 200 MPa） and different steel fiber volume fractions （0%, 1%, 2%, 3%） are prepared. The main properties of mechanical performance and short-term durability are studied. A preloading frame is designed to apply a four- point load external flexural stress with a stress selection ratio of 0.5 for UHPFRCC150 specimens. The results show that the growth in strength grade with a proper content of steel fiber greatly increases the strength and toughness of the HPFRCC and the UHPFRCC while decreasing the dry-shrinkage ratio. For the loaded specimens, the existence of steel fiber can reduce the negative influence of tensile stress on the Cl- penetration resistance of the UHPFRCC in addition to improving its ability to resist the freeze-thaw damage.

关键词： ultra-high performance fiber reinforced cementitious composite couple effect of load and environment mechanical properties durability

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