Optimizing mix proportion of recycled aggregate concrete by readjusting the aggregate gradation

Duan, Zhenhua; Li, Biao; Guo, Wei

doi:10.1002/suco.201900517

Cited by 16 publications

(14 citation statements)

References 39 publications

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“…It was reported that the fresh properties were influenced by the water/cement ratio, quantity of RA and the paste volume. Duan et al 40 evaluated the effect of aggregate grading on the properties of RAC. The aggregate grading was adjusted to obtain RAC with mechanical properties similar to those of NAC.…”

Section: Introductionmentioning

confidence: 99%

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Influence of mix composition on the properties of recycled aggregate concrete

Zaben

Maslehuddin

Al‐Amoudi

et al. 2021

Structural Concrete

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There is an increasing trend towards using recycled aggregate (RA) in concrete due to the shortage of high quality natural aggregates. The use of RA in concrete results in the conservation of natural resources, protects the environment and encourages sustainable construction. Though some studies have been conducted on the use of recycled aggregate concrete (RAC), the effect of mixture composition on its properties has not been well addressed. In the reported study, the effect of mixture composition, namely cement content and water/ cement ratio and the proportion of RA on the mechanical properties of RAC was evaluated, with the intention of developing varying grades of RAC. As reported in earlier studies, the properties of RAC were generally inferior to that of normal aggregate concrete (NAC). Notwithstanding this, RAC with acceptable mechanical properties can be produced utilizing RA, for example RAC with low strength can be used in non-structural applications. The construction industry should be encouraged to use RAC in building construction; as its use will lead to technical, economic and environmental benefits. Further, the use of RAC will lead to a sustainable development of the construction industry, particularly in regions that lack good quality natural aggregates.Based on the data developed in the reported study, the following quantities of RA are recommended to produce RAC: (i) 20% to produce low strength (20--30 MPa) concrete, (ii) 40% to produce medium (30-50 MPa) concrete and high strength (more than 50 MPa) concrete. Mathematical correlations between the mechanical properties of RAC with varying mix design parameters, such as cement content and water cement ratio and the quantity of RA, are also reported. These correlations can be used to predict the properties of RAC prepared with other proportions of RA and mix design parameters.bond strength, compressive strength, mixture proportions, modulus of elasticity, morphology, recycled aggregate concrete, tensile strength Discussion on this paper must be submitted within two months of the print publication. The discussion will then be published in print, along with the authors' closure, if any, approximately nine months after the print publication.

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Section: Introductionmentioning

confidence: 99%

“…Furthermore, the proportions of RA/NA can be wisely selected to obtain the desired properties of RAC. 42 The use of RA will lead to technical, economic and environmental benefits, including conservation of natural sources of aggregates. Also, the use of RAC will lead to a sustainable development of the construction industry.…”

Section: Introductionmentioning

confidence: 99%

Influence of mix composition on the properties of recycled aggregate concrete

Zaben

Maslehuddin

Al‐Amoudi

et al. 2021

Structural Concrete

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“…Aggregates (RCA) Recycled aggregates are different from natural aggregates due to the presence of cement gangue of old mortar, which remains attached to the natural aggregates after crushing of the original concrete and induces lower densities and greater capacity of water absorption [21]. A polished cylindrical specimen prepared only using coarse RCA and white cement is shown in Figure 2.…”

Section: Rcc Made With Recycled Concretementioning

confidence: 99%

Use of Demolished Concrete Waste for Resurfacing of Low Volume Roads in Sri Lanka Using Roller Compacted Concrete (RCC) Technology

Jayantha

Mampearachchi

2021

Engineer

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Roller Compacted Concrete Pavement (RCCP) is a type of zero-slump concrete product, which has renewed the interests of designers of sustainable pavements with its potential to reduce the cement content of the concrete mixture. RCC is produced with the same ingredients as in conventional concrete but with different blend proportions. RCCP construction procedure is similar to that of asphalt paving, where laying is performed using a modified asphalt paver, and steel drum rollers follow the paver to ensure the laid RCC mixture to be compacted to its desired density. This research aims to evaluate the applicability of deteriorated concrete pavement to reconstruct new pavement in an economical and sustainable approach. In this study, manually crushed concrete slabs were washed, sieved, and tested for aggregate strength to be used as a substitution for coarse aggregates (CA) in RCC. The soil compaction method is used for mix design, and the Vibratory Hammer Test (VHT) is used in place of the Modified Proctor Test (MPT) in determining the optimum moisture content (OMC) of RCC. The importance of incorporating the VHT in the mixture design process and the possibility of complete replacement of CA of RCC by Recycled Concrete Aggregate (RCA) are elaborated in this research.

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“…The indexes of highperformance concrete are often better than those of ordinary concrete. [36][37][38][39][40][41] Therefore, if the high-performance concrete is used to column, earthquake damage to the column will be greatly reduced. Taking the workshop column and the plaster layer as an example, the detail categories and the corresponding detail seismic damage descriptions are shown in Table 1.…”

Section: The Components and The Detail Seismic Damagementioning

confidence: 99%

“…In general, the column is made of normal concrete rather than high‐performance concrete. The indexes of high‐performance concrete are often better than those of ordinary concrete 36–41 . Therefore, if the high‐performance concrete is used to column, earthquake damage to the column will be greatly reduced.…”

Section: The Determination Of the Components And The Detail Seismic Dmentioning

confidence: 99%

Research on the safety assessment of RC workshop buildings in earthquake site based on the fuzzy comprehensive evaluation

Sun

Zhang

2020

Structural Concrete

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The safety assessment of damaged buildings in earthquake site, which is always performed by experienced experts and is very important during the postearthquake emergency period. However, the conclusions often vary from person to person because of the limited number of experts and the differences in their knowledge, backgrounds, specific research directions, and practical field experience. Therefore, it is necessary to find a fast and accurate calculation model. A single-story reinforced concrete column workshop is taken as an example in this paper. The earthquake damage assessment analysis and component detail earthquake damage are appraised according to the experts' previous earthquake experience and the qualitative provisions in the standard "Post-earthquake Field Works, Part 2: Safety Assessment of Buildings" (GB18208.2-2001). Based on these, the detail seismic damage is quantified. A mathematical model for the safety assessment of the single-story reinforced concrete column workshop is established by quantifying the relevant qualitative provisions in the national standards and applying the two-level fuzzy comprehensive evaluation method. The model is simple to use, which enables the general safety evaluators to share the experts' experience and minimizes the differences among the assessment results of different evaluators. K E Y W O R D S component detail earthquake damage, earthquake site, fuzzy comprehensive evaluation, safety assessment, single-story reinforced concrete column workshop 1 | INTRODUCTION Earthquake is a threat to people and building, 1 which have caused considerable losses and casualties. 2 The seismic performance of buildings will be changed greatly after earthquake. 3-5 After earthquake, rapid and accurate building damage and safety assessment is critical. 6-8 The

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Optimizing mix proportion of recycled aggregate concrete by readjusting the aggregate gradation

Cited by 16 publications

References 39 publications

Influence of mix composition on the properties of recycled aggregate concrete

Influence of mix composition on the properties of recycled aggregate concrete

Use of Demolished Concrete Waste for Resurfacing of Low Volume Roads in Sri Lanka Using Roller Compacted Concrete (RCC) Technology

Research on the safety assessment of RC workshop buildings in earthquake site based on the fuzzy comprehensive evaluation

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