Mechanical and fracture properties of concrete containing treated and untreated recycled concrete aggregates

Kazemian, F.; Rooholamini, Hamed; Hassani, Abolfazl

doi:10.1016/j.conbuildmat.2019.03.179

Cited by 140 publications

(38 citation statements)

References 47 publications

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“…They observed improvement in compressive strength of concrete up to 50%, splitting tensile strength of 41%, and elastic modulus 42.5% in comparison with untreated RCAs. Kazemian, Rooholamini [38] reported that the 28 days compressive strength of concrete with 50% substitution of NA with RCA increased 12.5% after acid treatment along with surface modification with calcium metasilicate slurry. In general, coating of RCA with different pozzolanic additives aims to fill the weak areas and develop stronger ITZs between RCA and cement paste.…”

Section: Introductionmentioning

confidence: 99%

Influence of Surface Treatment of Recycled Aggregates on Mechanical Properties and Bond Strength of Self-Compacting Concrete

et al. 2019

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In the last decade there has been a massive growth for development of concrete infrastructures all around the world. Take into account environmental concerns, concrete technology should direct efforts toward assuring development and fabrication of sustainable and resilient concrete. For this purpose, incorporation of recycled concrete aggregate in concrete products particularly self-compacting concrete (SCC) for structural and non-structural application would be significant achievement. In this study the fresh and hardened properties of SCC prepared by substituting natural aggregates (NA) with recycled coarse aggregates (RCA). In addition, bonding behaviour of reinforced RCA-SCC for structural application was investigated. Moreover, surface treatment of RCA using lithium silicate solution was proposed to investigate its feasibility to improve the fresh and hardened properties of SCC as well as its bonding strength. The mechanical properties including compressive strength, tensile strength and elastic modulus of SCC mixes using untreated RCA and treated RCA (TRCA) were investigated. The results showed an improvement in performance of SCC mixes made with TRCA in compare with the untreated samples. The bond behaviour between SCC made with RCA and steel reinforcement was studied and the relationship between the brittleness and bonding of SCC mixes using untreated RCA and TRCA determined. The effect of surface treatment on the interfacial transition zone (ITZ) between adhered mortar and RCA studied using scanning electron microscope (SEM). It was determined that the treatment of RCA improved the bond at the ITZ through densification. The results gave experimental evidence of the suitability of RCA-SCC for structural use and application in reinforced concrete.

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Section: Introductionmentioning

confidence: 99%

Influence of Surface Treatment of Recycled Aggregates on Mechanical Properties and Bond Strength of Self-Compacting Concrete

et al. 2019

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“…That analytical model is based on the assumptions, constitutive relations, and methods described in this section. The references highlight advances at the cutting edge of research relative to non-linear modeling of RC structures [46,47,48,49,50,51,52].…”

Section: Modelmentioning

confidence: 99%

Bending Load-Carrying Capacity of Reinforced Concrete Beams Subjected to Premature Failure

Foraboschi

2019

Materials

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This paper investigates the ultimate flexural strength of reinforced concrete beams when affected by premature failure due to a rotational capacity of the first plastic hinge being consumed before the last plastic hinges reach their maximum possible moment. The paper provides a simple formula for predicting the ultimate load of a hyperstatically supported beam, taking into account the available ductility. The proposed formula is the result of calibration against the ultimate loads from a non-linear analysis on a variety of beams, with a wide spectrum of configurations and with concrete grades from 10.0 to 60.0 N/mm2. The formula in based on the plastic hinge model, making it easy to apply, and the ultimate bending moments allow for the actual rotational capacity, making predictions accurate.

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“…This positive aspect is attributed to the fact that the hydration of MgO leads to compensation of shrinkage, as described by Mo et al [ 17 ]. Kabir and Hooton [ 29 ] observed a reduction of shrinkage by more than 50% in concrete with 15% reactive MgO content. The authors also found that the use of low reactivity MgO did not cause the same effect and obtained shrinkage similar to that of the reference concrete.…”

Section: Introductionmentioning

confidence: 99%

Performance of Mortars with Commercially-Available Reactive Magnesium Oxide as Alternative Binder

et al. 2021

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This paper intends to analyze the performance of mortars with reactive MgO, as a sustainable alternative to cement. Six different MgOs from Australia, Canada, and Spain were used in the production of mortars as partial substitutes for cement, namely 5%, 10%, 15%, 20%, and 25% (by weight). MgOs with different levels of reactivity were used to analyze its influence on the performance of MgO mortars. In order to evaluate the mechanical performance of these mortars, compressive strength, flexural strength, dynamic modulus of elasticity, and ultrasonic pulse velocity tests were performed. Compressive strength tests showed that the use of 25% reactive MgO can cause a decrease of this property of between 28% and 49%. The use of reactive MgO affected the other mechanical properties less. This paper also intends to analyze the durability performance of mortars with reactive MgO. To that effect, water absorption by capillarity was assessed. In this research, the effect of using MgO on the shrinkage was also analyzed. It was found that shrinkage may decrease by more than a half in some cases.

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Mechanical and fracture properties of concrete containing treated and untreated recycled concrete aggregates

Cited by 140 publications

References 47 publications

Influence of Surface Treatment of Recycled Aggregates on Mechanical Properties and Bond Strength of Self-Compacting Concrete

Influence of Surface Treatment of Recycled Aggregates on Mechanical Properties and Bond Strength of Self-Compacting Concrete

Bending Load-Carrying Capacity of Reinforced Concrete Beams Subjected to Premature Failure

Performance of Mortars with Commercially-Available Reactive Magnesium Oxide as Alternative Binder

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