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ABSTRACTThe ordinary fine aggregate in concrete has been replaced by ground and sieved steel slag fine aggregate, treated and exposed to air for three months.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.

The effect of Bond Characteristics Between Steel Slag fine Aggregate and Cement Paste on Mechanical Properties of Concrete and Mortar

1987 ◽  
Vol 113 ◽  
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ABSTRACTThe ordinary fine aggregate in concrete has been replaced by ground and sieved steel slag fine aggregate, treated and exposed to air for three months.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 Analysis of the mechanical properties of the concrete with partial substitution of the kind’s aggregate glass powder

2021 ◽  
Vol 9 (6) ◽  
pp. 406-425
Author(s):  
Paulo Ricardo Alves dos Reis Santos ◽  
Diovana da Silva Santos ◽  
Max Silva de Almada ◽  
Lirana Lamara Barreto da Silva ◽  
Italo Gutierry Carneiro da Conceição ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Large Scale ◽  
Glass Powder ◽  
Experimental Methodology ◽  
Partial Substitution ◽  
Fine Aggregate ◽  
Structural Concrete ◽  
Natural Sand ◽  
Hardened State ◽  
Object Of Study

In this study, the influence of partial introduction as glass as fine aggregate on the composition of simple concrete is analyzed, considering that sand (fine aggregate currently used) has been used on a large scale in civil construction over the years and has been affecting the environment. The main objective of this research was to analyze the mechanical properties of concrete, partially replacing the natural sand with another fine aggregate made from glass residues, evaluating the behavior presented at the end of each test using different percentages of this material as fine aggregate in the concrete composition. From an experimental methodology that consisted of determining an object of study (concrete), selecting the variable that would possibly be able to influence it (glass powder) and defining the ways of controlling and observing the effects that the variable would produce on the object, an interpretation of how the mechanical properties of the glass powder that affect the performance of structural concrete is presented. The granulometry was subsequently analyzed, the tests carried out both in the fresh and hardened state of the concrete, and identified that the glass in a certain percentage proves to be viable. Finally, it can be concluded that the partial inclusion of glass affects the mechanical properties of structural concrete, and can present quite satisfactory results, both related to the environment, since the sand would not be used entirely as fine aggregate or in reaching a resistance suitable for its final use.

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.

Effects of Microstructure on Fracture Behavior of Hardened Cement Paste

1994 ◽  
Vol 370 ◽  
Author(s):  
Asif Ahmed ◽  
Leslie Struble
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Cement Paste ◽  
Fracture Behavior ◽  
Curing Temperature ◽  
Hardened Cement ◽  
Curing Time ◽  
Hardened Cement Paste ◽  
Fracture Parameters ◽  
Initial Hypothesis

AbstractMechanical properties of any material, including hardened cement paste, are assumed to be controlled by its microstructure. An attempt has been made here to establish a link between bulk fracture parameters of hardened cement paste and its microstructure. Paste microstructure has been varied by changing the initial w/c ratio, curing time and curing temperature, and by addition of chemicals to change the calcium hydroxide morphology. It has been found that, like compressive strength, fracture parameters depend directly on porosity. Contrary to our initial hypothesis, CH morphology was found to have no effect on the fracture parameters.

scholarly journals Utilization of Fly Ash and Iron Slag in Concrete - An Experimental Study

2018 ◽  
Vol 7 (3.12) ◽  
pp. 235
Author(s):  
Cherukuru Surendra ◽  
Karthik S ◽  
Saravana Raja Mohan K
Keyword(s):  
Mechanical Properties ◽  
Fly Ash ◽  
Steel Slag ◽  
Cement Industry ◽  
Partial Replacement ◽  
Fine Aggregate ◽  
Conventional Concrete ◽  
Waste Products ◽  
Iron Slag ◽  
Strength Tests

The cement industry is responsible for about 6% of all CO2 emissions in the environment and numerous waste products out from the industries which is generating a lots of dumping problems and global warming. The main aim of this present study is to experimentally study the influence of partial replacement of cement with fly ash (FA) and partial replacement of fine aggregate with iron slag (IS) on the mechanical properties of concrete. Totally 10 mixes were prepared with 10, 20 and 30% replacements level of cement with fly ash and fine aggregate is replaced with 10, 20 and 30% by steel slag. The compressive and splitting tensile strength tests were found out after 7, 14, 28 and 7, 28 days age of curing for all the mixes respectively. Results were compared with conventional concrete and the optimum replacement percentage of FA and IS has reported.

scholarly journals Studies on manufactured sand effect on mechanical properties of geopolymer concrete as replacement of river sand in fine aggregate

2021 ◽  
Vol 309 ◽  
pp. 01114
Author(s):  
K. Veera Babu ◽  
T. Srinivas ◽  
Mahathi Tummala
Keyword(s):  
Mechanical Properties ◽  
Fly Ash ◽  
Construction Material ◽  
Environmental Concerns ◽  
Fine Aggregate ◽  
Geopolymer Concrete ◽  
River Sand ◽  
Natural Sand ◽  
Manufactured Sand ◽  
Low Calcium

Concrete is the most adaptable, long-lasting, and dependable construction material on the planet. There are numerous environmental concerns associated with the production of OPC, and natural sand is becoming more expensive and scarce as a result of unlawful river sand dredging. The greatest replacement material for traditional concrete is geopolymer concrete with low calcium fly ash. The purpose of this paper is to investigate the mechanical properties of geopolymer concrete of grades G30 and G50, which are equivalent to M30 and M50, when river sand is substituted in various quantities with manufactured sand, such as 0%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, and 100%. When compared to the equivalent grades of controlled concrete, geopolymer concrete improves mechanical properties such as compressive, tensile, and flexural strengths.

Influence of steel slag on the mechanical properties and curing time of metakaolin geopolymer

2018 ◽  
Vol 44 (13) ◽  
pp. 15706-15713 ◽  
Author(s):  
Tao Bai ◽  
Zi-Ge Song ◽  
Yan-Guang Wu ◽  
Xiao-Di Hu ◽  
Hua Bai
Keyword(s):  
Mechanical Properties ◽  
Steel Slag ◽  
Curing Time ◽  
Metakaolin Geopolymer

Effect of Uncontrolled Burning Rice Husk Ash in Foamed Concrete

2012 ◽  
Vol 626 ◽  
pp. 769-775 ◽  
Author(s):  
Josef Hadipramana ◽  
Abdul Aziz Abdul Samad ◽  
Ahmad Zaidi Ahmad Mujahid ◽  
Noridah Mohammad ◽  
Fetra Venny Riza
Keyword(s):  
Compressive Strength ◽  
Chemical Composition ◽  
Cement Paste ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Amorphous Material ◽  
Fine Aggregate ◽  
Interfacial Zone ◽  
Wide Range ◽  
Foamed Concrete

Recently, foamed concrete has become a popular construction material that can be used in wide range of constructions application. Whilst the Rice Husk Ash (RHA) as agro-waste is contain high amount of silicon dioxide. RHA is produced in significant amount every year from agriculture countries. RHA has potential as a material to produce foamed concrete. In this research RHA has been used as a replacement for fine aggregate which used in construction as ordinary concrete material. In this study, foamed concrete with target density 1400, 1600 and 1800 kg/m3 has been produced. The compressive strength of foamed concrete with RHA has been tested. Concrete with Ratio 1:3 of RHA/Sand has higher compressive strength than ratios 3:1 and 2:2 of RHA/sand for every density. XRD and XRF test has been used to determinate chemical composition and crystalline structure of RHA. The result showed that RHA is an amorphous material which amorphous is important thing to pozzolanic process when hydration of cement paste. SEM and EDS test has been conducted to determine microstructure and chemical composition on microstructure of RHA foamed concrete. Amorphous RHA incorporating cement paste produces pozzolanic reaction. It is reduces the porosity and width of interfacial zone in such a way the density is increase.

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