Durability and microstructural properties of concrete with recycled brick as fine aggregates

Dang, Juntao; Zhao, Jun; Pang, Sze Dai; Zhao, Shunbo

doi:10.1016/j.conbuildmat.2020.120032

Cited by 59 publications

(14 citation statements)

References 29 publications

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“…In this case, two zones were observed: a siliceous aggregate or piece of brick, which is in accordance with the nature of the RMA ( Figure 2 ), and cement paste containing Ca, Al, K, and Mg as the main elements. Furthermore, microcracks and a possible interfacial transition zone (ITZ), which is the area between the old and the new cement paste and is the weakest region in MRA mortar [ 3 , 90 , 91 ], were observed. These could explain the decrease in mechanical properties ( Figure 3 and Figure 4 ) with the replacement of NA by RMA (with normal and carbonated water under CC) and the higher porosity found with RMA ( Figure 5 ).…”

Section: Resultsmentioning

confidence: 99%

Use of Carbonated Water as Kneading in Mortars Made with Recycled Aggregates

2022

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The increased concern about climate change is revolutionising the building materials sector, making sustainability and environmental friendliness increasingly important. This study evaluates the feasibility of incorporating recycled masonry aggregate (construction and demolition waste) in porous cement-based materials using carbonated water in mixing followed (or not) by curing in a CO2 atmosphere. The use of carbonated water can be very revolutionary in cement-based materials, as it allows hydration and carbonation to occur simultaneously. Calcite and portlandite in the recycled masonry aggregate and act as a buffer for the low-pH carbonated water. Carbonated water produced better mechanical properties and increased accessible water porosity and dry bulk density. The same behaviour was observed with natural aggregates. Carbonated water results in an interlaced shape of carbonate ettringite (needles) and fills the microcracks in the recycled masonry aggregate. Curing in CO2 together with the use of carbonated water (concomitantly) is not beneficial. This study provides innovative solutions for a circular economy in the construction sector using carbonated water in mixing (adsorbing CO2), which is very revolutionary as it allows carbonation to be applied to in-situ products.

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Section: Resultsmentioning

confidence: 99%

Use of Carbonated Water as Kneading in Mortars Made with Recycled Aggregates

2022

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“…The two types of fRA were used as a replacement for natural sand in the concrete mixture. The fRCA is produced by crushing waste concrete from CDW [ 34 , 35 , 36 , 37 ] and the fRMA originated from waste masonry [ 38 , 39 , 40 , 41 ]. Both types of aggregate originate from a recycling center in the Czech Republic.…”

Section: Methodsmentioning

confidence: 99%

Environmental Impact of Concrete Slab Made of Recycled Aggregate Concrete Based on Limit States of Load-Bearing Capacity and Serviceability—LCA Case Study

Pavlů

Pešta²,

Vlach³

et al. 2023

Materials

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In the case of concrete sustainability, two main ways are generally discussed: (1) the reduction of natural raw materials and (2) the reduction of emissions related to concrete production. Following the second point, there have not yet been reported clear results. This problem is not given enough attention in present publications. This study brings a general view of this issue and a basic comparison with common concrete and traditional reinforcement. This case study deals with the life cycle analysis of a concrete slab made of recycled aggregate concrete with a fine recycled aggregate. The concrete slab was designed according to the limit states of load-bearing capacity and serviceability, which is based on the experimental verification of recycled aggregate concrete properties. Two different reinforcements are compared: (1) ordinary reinforcement by steel bars and (2) glass fibers. Furthermore, scenarios vary due to the slab thickness and reinforcement percentage. The results show the positive environmental impact of replacing natural sand with a fine recycled aggregate. The reduction of climate change potential can be almost 40% in some cases.

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“…Their study also showed that the use of fine RBA caused a negative effect on the resistance of SCC against chloride ion penetration. According to Dang et al [20], the replacement of sand with fine RBAs contributed to reducing chloride migration due to the pozzolanic reactivity of RBA; however, their presence caused an increase in carbonation, water sorptivity, water absorption, and drying shrinkage. The pore structure of concrete was observed to be deteriorated in the presence of fine recycled brick aggregates because of their porous structure.…”

Section: Introductionmentioning

confidence: 99%

Mechanical and Durability Characterization of Hybrid Recycled Aggregate Concrete

Hameed,

Tahir,

Abbas

et al. 2024

Materials

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The recycling of construction and demolition waste (CDW) for the extraction of recycled concrete aggregates (RCAs) to be used to produce recycled aggregate concrete (RAC) is widely acknowledged internationally. However, CDW not only contains concrete debris but may also contain burnt clay bricks. The recycling of such CDW without the segregation of different components would result in recycled aggregates having different proportions of concrete and brick aggregates. The utilization of these aggregates in concrete requires a detailed investigation of their mechanical and durability properties. In this regard, the present study focused on investigating the mechanical and durability properties of hybrid recycled aggregate concrete (HRAC) made by the 100% replacing of natural aggregates with recycled brick (RBAs) and RCA in hybrid form. The partial replacement of cement with fly ash was also considered to reduce the corban footprint of concrete. An extensive experimental program was designed and carried out in two phases. In the first phase, a total of 48 concrete mixes containing coarse RBA and RCA in mono and hybrid forms were prepared and tested for their compressive strength. The test results indicated that the compressive strength of HRAC is greatly affected by the proportion of coarse RBA and RCA. In the second phase, based on the results of the first phase, eight concrete mixes with the most critical proportions of RBA and RCA in hybrid form were selected to evaluate their mechanical and durability performance. In addition, four mixes with natural aggregates were also prepared for comparison purposes. To evaluate the mechanical properties of the concrete mixes, compressive strength and modulus of rupture (MOR) tests were performed, while for the evaluation of durability properties, water absorption and behavior after exposure to aggressive conditions of acidic and brine solutions were studied. The results revealed that a 20% replacement of cement with fly ash resulted in acceptable mechanical and durability properties of HRAC intended to be used for making concrete bricks or pavers.

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Durability and microstructural properties of concrete with recycled brick as fine aggregates

Cited by 59 publications

References 29 publications

Use of Carbonated Water as Kneading in Mortars Made with Recycled Aggregates

Use of Carbonated Water as Kneading in Mortars Made with Recycled Aggregates

Environmental Impact of Concrete Slab Made of Recycled Aggregate Concrete Based on Limit States of Load-Bearing Capacity and Serviceability—LCA Case Study

Mechanical and Durability Characterization of Hybrid Recycled Aggregate Concrete

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