Effect of aqueous sodium silicate on properties of recycled aggregate mortar

Ali, Babar

doi:10.1007/s42452-019-1342-2

Cited by 22 publications

(8 citation statements)

References 33 publications

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“…The compressive strength of cement‐based composites is an important property, which is widely considered in the design of concrete structures. It can also be used to fairly estimate the other mechanical 3,12 and durability characteristics 48,50 of cement‐based materials. In this research, the compressive strength of all concrete mixtures was evaluated at the age of 28, 90, and 180 days.…”

Section: Resultsmentioning

confidence: 99%

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Influence of different fibers on mechanical and durability performance of concrete with silica fume

Ali

Raza

Hussain

et al. 2020

Structural Concrete

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Durability and ductility of plain cement concrete (PC) can be upgraded by the simultaneous incorporation of fibers and supplementary cementitious materials. To this end, influence of different fibers such as steel fiber (SF), glass fiber (GF), carbon fiber (CF), and polypropylene fiber (PF) is studied on mechanical and durability properties of concrete with and without silica fume. Silica fume was used as 10% by mass replacement of ordinary Portland cement. Various mechanical and durability properties were studied such as compressive strength, split tensile strength, flexural strength, water absorption (WA), chloride penetration (CP), and acid attack resistance of concrete. The results of testing revealed that silica fume improved the efficiency of fibers in resisting the tensile and flexural loads. The composite effect of fiber and silica fume was more beneficial than the sum of the effects of their individual incorporation. Steel fiber‐reinforced concrete (SFRC) showed better mechanical performance at 28 days as compared to other FRCs but CFRC showed better performance at 180 days. PFRC and CFRC exhibited better durability performance than SFRC and GFRC. Silica fume helped in reducing the WA and CP of FRCs and improved their acid attack resistance.

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Section: Resultsmentioning

confidence: 99%

“…These CPs were recorded at six different locations along the edge of the failure surface. Ali 48 and Ali and Qureshi 49 have adopted similar methodologies to estimate CP. To evaluate the acid attack resistance of concrete mixes, cylindrical specimens (having height and diameter of 100 mm) were used.…”

Section: Methodsmentioning

confidence: 99%

Influence of different fibers on mechanical and durability performance of concrete with silica fume

Ali

Raza

Hussain

et al. 2020

Structural Concrete

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“…Ali [10] studied the effect of sodium silicate addition to a recycled concrete aggregate containing mortar (RAM). For this purpose, sodium silicate was used in the amounts of 0%, 1%, 2%, 3%, 4%, and 5% by weight of cement in RAM and the performance of the RAM was compared with the performance of the natural aggregate mortar (NAM).…”

Section: Sodium Silicate Solutionmentioning

confidence: 99%

“…Numerous researchers investigated the use of different approaches and methods for the improvement of concrete characteristics with RCA addition. These include removing the adhered mortar or strengthening RCA using carbonation treatment [7], mineral admixtures [8], calcium carbonate biodeposition [9], sodium silicate solution [10], and water-repellent coat by polymer treatment [11]. Several review papers are available on improving the performance of RCA.…”

Section: Introductionmentioning

confidence: 99%

A Review of Improvement of Interfacial Transition Zone and Adherent Mortar in Recycled Concrete Aggregate

2022

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An increasing amount of construction and demolishing waste has made the implementation of recycled concrete aggregate (RCA) a popular topic; RCA can reduce the environmental pollution caused by the construction industry. This paper describes differences in physical, mechanical, and chemical properties between RCA and natural aggregate (NA). For the first time, the methods of interfacial transition zone (ITZ) improvement in RCA, including strengthening through carbonation, incorporation of mineral admixtures, and different mixing approaches, are extensively covered. In addition, the methods used to improve the adherent mortar regions of RCA are covered. This approach makes it possible to demonstrate the impact of different methods on these regions (ITZ and adhered mortar) and overall RCA enhancement. Lastly, a comparison of each of these methods in terms of their effectiveness is presented. The review of several studies concludes that the carbonation treatment method for ITZ and adherent mortar enhancement are the most efficient and sustainable methods compared to others. Summarizing, using RCA instead of NA provides a sustainable solution for the construction industry due to reducing the amount of produced waste and conserving landfill space.

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“…Concrete made with RCA has been proved a weaker and expensive product than the conventional concrete [1,[11][12][13]. Impact of recycled aggregates on the economy of concrete considering performance of concrete based on strength has been broadly discussed and it was reported that higher production costs were associated with consumptions of RCA in concrete [2,3,[14][15][16]. In order to minimize the negative impact of recycled aggregates on strength and durability of concrete, Akhtar et al [1] reported that 30-50% recycled aggregates can be used in concrete with supplementary cementitious materials.…”

Section: Introductionmentioning

confidence: 99%

Mechanical, durability and economic performance of concrete incorporating fly ash and recycled aggregates

Nawaz

Qureshi

Ali³

et al. 2020

SN Appl. Sci.

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This paper studies the impact of replacing natural coarse aggregates (NCA) with recycled coarse aggregates (RCA) and cement (OPC) with fly ash (FA), on properties and economy of concrete. RCA was obtained by crushing old concrete specimens. FA of low calcium type was used to partially replace OPC. A total of nine concrete mixes (including a reference mix) were prepared using 50% RCA, and 100% RCA with four different levels of FA (0% FA, 10% FA, 20% FA, 30% FA). Workability, fresh density, compressive strength, apparent porosity, and bulk density was measured to evaluate the performance of each mixture. Mixes with optimum levels of both RCA and FA reaching the compressive strength potential of reference mix at 90 days, were subjected to chloride migration testing. To ascertain the combined impact of RCA and FA on economic and strength performance of concrete, a cost to strength ratio (CSR) analysis was also performed on all mixes. Results of testing indicate that FA compensates the loss in workability of fresh concrete and improve the compressive strength of RCA concrete at 28 and 90 days. Negative influence of RCA on density and porosity is minimized by consumption of FA in concrete. Mixes with 50% RCA and 20-30% FA show better resistance against chloride penetration compared to that of the reference mix. CSR analysis suggests that FA must be used along with RCA in concrete in order to minimize the negative influence of RCA on both cost and strength.

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Effect of aqueous sodium silicate on properties of recycled aggregate mortar

Cited by 22 publications

References 33 publications

Influence of different fibers on mechanical and durability performance of concrete with silica fume

Influence of different fibers on mechanical and durability performance of concrete with silica fume

A Review of Improvement of Interfacial Transition Zone and Adherent Mortar in Recycled Concrete Aggregate

Mechanical, durability and economic performance of concrete incorporating fly ash and recycled aggregates

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