Effect of mix design parameters on mechanical and durability properties of alkali activated slag concrete

Thunuguntla, Chaitanya Srikrishna; Rao, T. D. Gunneswara

doi:10.1016/j.conbuildmat.2018.10.189

Cited by 105 publications

(37 citation statements)

References 19 publications

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“…For the conventional concrete system based on ordinary Portland cement, it has been established that the compressive strength and UPV values are usually highly correlated. However, a study by Thunuguntla et al found that the standard UPV values of conventional concrete may not reflect the quality of alkali-activated concrete [ 41 ]. The present study focuses on preplaced alkali-activated concrete, which has a quite different internal system from conventional concrete.…”

Section: Resultsmentioning

confidence: 99%

Characteristics of Preplaced Aggregate Concrete Fabricated with Alkali-Activated Slag/Fly Ash Cements

et al. 2021

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This study assesses the characteristics of preplaced aggregate concrete prepared with alkali-activated cement grout as an adhesive binder. Various binary blends of slag and fly ash without fine aggregate as a filler material were considered along with different solution-to-solid ratios. The properties of fresh and hardened grout along with the properties of hardened preplaced concrete were investigated, as were the compressive strength, ultrasonic pulse velocity, density, water absorption and total voids of the preplaced concrete. The results indicated that alkali-activated cement grout has better flowability characteristics and compressive strength than conventional cement grout. As a result, the mechanical performance of the preplaced aggregate concrete was significantly improved. The results pertaining to the water absorption and porosity revealed that the alkali-activated preplaced aggregate concrete is more resistant to water permeation. The filling capacity based on the ultrasonic pulse velocity value is discussed to comment on the wrapping ability of alkali-activated cement grout.

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Section: Resultsmentioning

confidence: 99%

Characteristics of Preplaced Aggregate Concrete Fabricated with Alkali-Activated Slag/Fly Ash Cements

et al. 2021

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“…One of the principal mix design parameters that can tremendously affect the alkaliactivated slag concrete characteristics is the molarity of the alkaline solutions [41]. Figure 5 shows the compressive strength reduction of the AASC samples with different molarities immersed in an HCl acid solution for up to six months.…”

Section: Sodium Hydroxide Molaritymentioning

confidence: 99%

“…Eight different mix designs were formulated for the tests. The results showed that the NaOH concentration was found to be the most influential parameter on the mechanical strength and durability characteristics of AASC [41]. Molarity and type of alkaline solutions are two vital elements in the mix design of AASC [43].…”

Section: Introductionmentioning

confidence: 99%

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Mix Design Effects on the Durability of Alkali-Activated Slag Concrete in a Hydrochloric Acid Environment

2021

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Because of its high strength, energy reduction, and low environmental impact, researchers have encouraged considering alkali-activated slag concrete (AASC) as a potential alternative to conventional concrete. In this study, the impact of mix design parameters on the durability of AASC, made with ground granulated blast furnace slag and activated with different alkaline solutions (NaOH, KOH, and Na2SiO3) immersed up to six months in a hydrochloric acid bath with pH = 3, has been investigated. A total of 13 mix designs were made in a way that, in addition to the type of alkaline solution, considered three other parameters, namely the molarity of alkaline solutions, the weight ratio of alkaline solutions to slag, and the weight ratio of alkaline solutions to sodium silicate. Visual inspections displayed that the AASC samples almost remained intact after exposure to an HCl acid solution with pH = 3 for up to 6 months, while the OPC sample experienced deleterious deterioration. The results clearly show that AASC outperformed OPC concrete when it comes to durability in an HCl acid solution. The strength reduction and weight loss of AASC compared with OPC concrete were approximately one-tenth and one-fifth, respectively. The AASC samples containing potassium hydroxide showed a higher strength reduction and weight loss in the HCl acid solution than the samples made with sodium hydroxide.

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“…In order to improve the frost resistance property of concrete, a certain amount of air-entraining agent would usually be added to the concrete mixture. Relevant literature has reported that adding an appropriate amount of rubber particles into the concrete mixture can also effectively improve the frost resistance property of concrete, where rubber particles are equivalent to the solid air-entraining agent [6][7][8]. Among the research aiming at the effect of freezethaw cycles on rubber concrete, Paine et al [9] examined the frost resistance of concrete specimens mixed with rubber particles of varying sizes.…”

Section: Introductionmentioning

confidence: 99%

An Experimental Study on the Compressive Dynamic Performance of Rubber Concrete under Freeze‐Thaw Cycles

Zhang

Zhang²,

Sun

et al. 2021

Advances in Civil Engineering

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An experimental study was conducted using a hydraulic servo machine to examine the compressive dynamic performance of rubber concrete under freeze-thaw cycles by considering 4 different numbers of freeze-thaw cycles and 8 different strain rates. The compressive stress-strain curves of rubber concrete under different loading conditions were obtained. By comparatively analyzing the mechanical characteristic parameters of the compressive stress-strain curves (i.e., peak stress, elastic modulus, and peak strain), the following conclusions were drawn: at the same loading strain rate, the compressive peak stress of rubber concrete is gradually decreased while the mass loss rate is gradually increased, as the number of freeze-thaw cycles increases. Compared to ordinary concrete, rubber concrete has a better frost resistance property. At the same number of freeze-thaw cycles, the compressive peak stress and elastic modulus of rubber concrete are gradually increased as the loading strain rate increases. The increase in the number of freeze-thaw cycles enlarges the increasing amplitude of the peak stress and elastic modulus under the action of loading strain rate. The compressive peak stress and elastic modulus dynamic increase factors of rubber concrete exhibit a linear relationship with the dimensionless logarithm of the loading strain rate. Meanwhile, a calculation model was proposed for the compressive peak stress dynamic increase factor of rubber concrete under the coupling effect of freeze-thaw cycles and loading strain rate, and the corresponding stress mechanism was discussed in detail. The research findings are of great significance to the application and development of antifreeze concrete in engineering practice.

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Effect of mix design parameters on mechanical and durability properties of alkali activated slag concrete

Cited by 105 publications

References 19 publications

Characteristics of Preplaced Aggregate Concrete Fabricated with Alkali-Activated Slag/Fly Ash Cements

Characteristics of Preplaced Aggregate Concrete Fabricated with Alkali-Activated Slag/Fly Ash Cements

Mix Design Effects on the Durability of Alkali-Activated Slag Concrete in a Hydrochloric Acid Environment

An Experimental Study on the Compressive Dynamic Performance of Rubber Concrete under Freeze‐Thaw Cycles

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