scholarly journals Hydration and Microstructure of Steel Slag as Cementitious Material and Fine Aggregate in Mortar

Molecules ◽  
2020 ◽  
Vol 25 (19) ◽  
pp. 4456 ◽  
Author(s):  
Wu Jing ◽  
Jinping Jiang ◽  
Sha Ding ◽  
Ping Duan
Keyword(s):  
Cement Paste ◽  
Steel Slag ◽  
Cementitious Material ◽  
Fine Aggregate ◽  
Hydration Products ◽  
River Sand ◽  
Volume Stability ◽  
Slag Powder ◽  
Calcium Aluminosilicate ◽  
Alkali Activated

Due to the low hydration activity and poor volume stability, extensive steel slag utilization is restricted. In this paper, the hydration process and microstructure of alkali-activated materials with steel slag as a cementitious material and fine aggregate were studied. The phase composition and micro-morphology of hydration products were measured using XRD, NMR and SEM. The response relationship between microstructure and mechanical properties during hydration was revealed. The results show that the main hydration products of the alkali-activated steel slag powder-granulated blast furnace slag powder cementitious system are Ca(OH)2 and calcium aluminosilicate hydrate (C-A-S-H) gel. With the progress of hydration, the amount of calcium silicate hydrate (C-S-H) gel and the average molecular chain length increase, Al[4]/Si decreases, while C/S increases first and then decreases, and the structure of cement paste becomes much more compact. The interface between steel slag sand and cement paste is denser than that of river sand, since the hydration occurs on the surface of steel slag sand, which leads to the formation of C-A-S-H gel and Ca(OH)2. As a result, the compressive strength of concrete prepared by steel slag sand is higher than that of river sand with the same mix proportion.

Experimental Study on the Comprehensive Application of Steel Slag in Concrete

2016 ◽  
Vol 867 ◽  
pp. 157-161
Author(s):  
Shi Ran Zhao ◽  
Kai Feng Zhang ◽  
Gang Meng ◽  
Yuan Yao ◽  
Ning Wang ◽  
...  
Keyword(s):  
Experimental Study ◽  
Coarse Aggregate ◽  
Steel Slag ◽  
Cementitious Material ◽  
Good Resistance ◽  
Volume Stability ◽  
Comprehensive Utilization ◽  
Slag Powder ◽  
Steel Slag Powder ◽  
Maximum Content

In this paper, the performance of steel slag composite cementitious material and the performance of steel slag concrete were studied, which provides reference for the comprehensive utilization of steel slag. The test shows that the activity of steel slag composite cementitious material with the specific surface area is greater than or equal to 400m2/kg to meet the use requirements; When the maximum content of coarse aggregate of steel slag was 25%, the volume stability of steel slag concrete was best. But when the content of steel slag powder was controlled within 30%, the concrete had good resistance to carbonation.

Researcher Progress of Steel Slag Cascade Utilization in Building Materials

2014 ◽  
Vol 629-630 ◽  
pp. 293-298 ◽  
Author(s):  
Gang Meng ◽  
Kai Feng Zhang ◽  
Shi Ran Zhao ◽  
Meng Xue Ouyang ◽  
Xiang Li
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Building Materials ◽  
Steel Slag ◽  
Test Methods ◽  
Fine Aggregate ◽  
Volume Stability ◽  
Slag Powder ◽  
Steel Slag Powder ◽  
Furnace Slag

This paper studied the cascade use of industrial waste slag as the cementitious material, the fine aggregate and the coarse aggregate, assisted by XRD, SEM and other microscopic test methods. The results that the system had the best volume stability when the steel slag addition of 40%. When the cement mortar prepared by 10% steel slag fine aggregate, and mixed with 20% steel slag powder and 20% blast furnace slag powder, the mortar construction performance and shrink resistant performance is excellent. On the basis of concrete double mixing 25% steel slag aggregate and 30% steel slag powder, compound mixing 20% blast furnace slag powder, the durable properties of concrete are also excellent.

The Properties of Flue Gas Desulphurization (FGD) Gypsum

2011 ◽  
Vol 105-107 ◽  
pp. 2204-2208 ◽  
Author(s):  
Run Xia Hao ◽  
Xiao Yan Guo
Keyword(s):  
Mechanical Properties ◽  
Flue Gas ◽  
Steel Slag ◽  
Optical Microscope ◽  
Cementitious Material ◽  
Fgd Gypsum ◽  
Technical Performance ◽  
Slag Powder ◽  
Steel Slag Powder ◽  
Flue Gas Desulphurization

The properties of flue gas desulphurization (FGD) gypsum were analysized by Thermo-gravimetry/differential scanning calorimetry (TG/DSC), technical performance analysis, optical microscope and Scanning electron microscope (SEM). Mechanical properties of FGD gypsum-steel slag powder cementitious material were researched. The results revealed that FGD gypsum have similar moisture content, major component CaSO4·2H2O with natural gypsum, and has better technical performance than natural gypsum. The results of optical microscope and SEM of the FGD gypsum hydration support this further. When the dosage of steel slag powder is 15%, containing activator ,better mechanical properties can be obtained. Key words: FGD gypsum, Property, Cementitious material

scholarly journals Investigation on Compressive Characteristics of Steel-Slag Concrete

Materials ◽  
2020 ◽  
Vol 13 (8) ◽  
pp. 1928 ◽  
Author(s):  
Thi-Thuy-Hang Nguyen ◽  
Duc-Hung Phan ◽  
Hong-Ha Mai ◽  
Duy-Liem Nguyen
Keyword(s):  
Compressive Strength ◽  
Coarse Aggregate ◽  
Concrete Strength ◽  
Research Work ◽  
Steel Slag ◽  
Shape Effect ◽  
Fine Aggregate ◽  
River Sand ◽  
A Value ◽  
One Year

The compressive characteristics of the steel-slag concrete were investigated through an experimental test. The term “steel-slag concrete” in this research work was defined as a kind of concrete using steel-slag material as a coarse aggregate replacement. Three types of the steel-slag concretes were examined under compression as follows: XT01, XT02, XT03 with their cement/water ratios of 1.76, 2.00, 2.21, respectively. The coarse aggregate used in producing concrete was steel-slag material, while the fine aggregate was traditional river sand; the ratio of coarse aggregate to fine aggregate was kept constant at a value of 1.98. Firstly, the age-dependent compressive strength of the steel-slag concretes were investigated up to one year; it was clear that the concrete strength increased rapidly in 7 days, then more and more slowly after that. Secondly, the modulus of elasticity and Poisson’s ratio of the steel-slag concretes were explored at the 28-day age. Thirdly, there was an important size and shape effect on the compressive strength of the XT02, and its significance of brittleness in failure was analytically analyzed. Lastly, the effects of water amount added in the XT02 on its compressive strength and slump were evaluated at the 28-day age.

Mechanical Properties and Microstructure Analysis of Copper Tailings Solidifying with Different Cementitious Materials

2014 ◽  
Vol 878 ◽  
pp. 171-176 ◽  
Author(s):  
Xu Quan Huang ◽  
Hao Bo Hou ◽  
Min Zhou ◽  
Wei Xin Wang
Keyword(s):  
Mechanical Properties ◽  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Calcium Silicate Hydrate ◽  
Steel Slag ◽  
Cementitious Materials ◽  
Cementitious Material ◽  
Hydration Products ◽  
New Type ◽  
Furnace Slag

With new type steel slag-blast furnace slag-fluorgypsum-based cemented material, P O42.5 cement, commonly used cementation agent in China, mechanical properties and microstructure of tailings solidification bodies are studied. The hydration products and morphology tailings concretion body in 60 days are analyzed by SEM and XRD test, which reveals the tailings cementation mechanism solidifying with different cementitious material. Furthermore, a large number of slender bar-like ettringite crystals and filamentous network-like calcium-silicate-hydrate gels bond firmly each other, which is the most important reason why steel slag-blast furnace slag-fluorgypsum base cemented material has the best tailings cementation mechanical properties.

Experimental Study on Alkali Stimulating-Steel Slag Cementitious Materials

2011 ◽  
Vol 261-263 ◽  
pp. 551-554
Author(s):  
Gong Xun Wang ◽  
Kui Jun Xu ◽  
Ming Qiao Zhu
Keyword(s):  
Experimental Study ◽  
Steel Slag ◽  
Cementitious Materials ◽  
Cementitious Material ◽  
Hydration Products ◽  
Structure Form ◽  
Alkaline Activator

In order to utilize the waste steel slag effectively, three kinds of alkaline activator such as Na2SO4, Na2SiO3, Na2CO­3 were used to prepare steel slag cementitious material and measure its strength of 28 days and 60 days in the standard wet conditions. Microcosmic structure form of hydration products of cementitious material was analyzed by the test of SEM. The results indicate that: three activators on the strength of steel slag all have certain stimulation effect, and Na2SO4 has the apparent stimulation effect on the strength of steel slag, the analysis and test of SEM also shows that hydration products structure form of steel slag cementitious material added with Na2SO4 is much more than other two activators and is more helpful to improve steel slag strength.

Methods for improving volume stability of steel slag as fine aggregate

2008 ◽  
Vol 23 (5) ◽  
pp. 737-742 ◽  
Author(s):  
Yunxia Lun ◽  
Mingkai Zhou ◽  
Xiao Cai ◽  
Fang Xu
Keyword(s):  
Steel Slag ◽  
Fine Aggregate ◽  
Volume Stability

The Effect of Bond Characteristics between Steel Slag Fine Aggregate and Cement Paste on Mechanical Properties of Concrete and Mortar

1987 ◽  
Vol 114 ◽  
Author(s):  
Wang Yuji
Keyword(s):  
Mechanical Properties ◽  
Cement Paste ◽  
Steel Slag ◽  
Fine Aggregate ◽  
Interfacial Zone ◽  
Curing Time ◽  
Natural Sand ◽  
Concentration Of Ions ◽  
Hydrated Products ◽  
Bond Characteristics

ABSTRACTThe ordinary fine aggregate in concrete has been replaced by ground and sieved steel slag fine aggregate, treated and exposed to air for three months. Compared with concrete made from natural sand, properties such as compressive strength, flexural strength, elastic modulus, permeability and abrasion resistance are considerably improved. The improvement increases with a decrease in w/c ratio, an increase in curing time and an increase in the replacement weight of sand. These results are due to the fact that the steel slag contains some active minerals such as C3S, C2S, C4AF, etc., and shows favorable surface physical characteristics that improve the bond between steel slag particles and cement paste. The results of XRD, SEM and EPM microhardness showed that there are heavier concentration of ions, with finer crystals and a lower degree of CH orientation at the interfacial zone between steel slag particles and cement paste. The study also found small cementitious and fibrous C-S-H crystals growing from the fine aggregate, which are linked with hydrated products from cement paste making the bond and structural characteristic more favorable with cement. The steel slag fine aggregate is an active mineral similar to cement. The bond between the aggregate and cement paste is strengthened both physically and chemically.

scholarly journals Alkali-Activated Stainless Steel Slag as a Cementitious Material in the Manufacture of Self-Compacting Concrete

Materials ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 3945
Author(s):  
Julia Rosales ◽  
Francisco Agrela ◽  
José Luis Díaz-López ◽  
Manuel Cabrera
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Fly Ash ◽  
Steel Slag ◽  
Cementitious Material ◽  
Self Compacting Concrete ◽  
Stainless Steel Slag ◽  
Alkali Activated ◽  
Activating Solution

This work develops the manufacture of self-compacting concrete (SCC) with 50% cement reduction. As an alternative binder to cement, the viability of using an alkali-activated combination of stainless steel slag (SSS) and fly ash (FA) has been demonstrated. SSS was processed applying three different treatments. Binders were manufactured mixing 35% SSS with 65% FA, as precursors, and a hydroxide activating solution. This binder was replaced by the 50% cement for the manufacture of SCC. The results obtained show good mechanical properties and durability. The study shows a reduction in the use of cement in the manufacture of SCC reusing two wastes.

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