Effect of Mixing Time and Temperature on Cracking Resistance of Bituminous Mixtures Containing Reclaimed Asphalt Pavement Material

Madrigal, Domingo; Iannone, Andrea; Martínez, Ana María Romero; Giustozzi, Filippo

doi:10.1061/(asce)mt.1943-5533.0001831

Cited by 21 publications

(3 citation statements)

References 11 publications

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“…Previous research concluded that the elastic modulus of RCA-concrete is approximately 15 to 30% lesser than the modulus of elasticity of normal concrete [51,52], while Gholampour et al [53] found that the elastic modulus decreases generally by about 20% when the replacement level is increasing. The literature survey indicated a large agreement of an imminent drop in the mechanical characteristics of RCA-concrete, and this drop is higher with the increase of the replacement level of NCA by the RCA.…”

Section: Modulus Of Elasticitymentioning

confidence: 96%

Recycled Concrete Aggregates and Their Influences on Performances of Low and Normal Strength Concretes

2020

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Recycled materials are now widely used in various industrial sectors to enhance sustainability and reduce environmental charges. Using recycled aggregates in concrete production significantly lowers demand for natural aggregates and the amount of solid waste sent to landfills. This paper summarizes the main results of a study undertaken to design low and normal strength concrete with various replacement ratios of coarse recycled concrete aggregates (RCA). To persuade the concrete industry to use recycled materials as one of the main components of concrete produced, the overall mechanical and durability performances of the RCA-concrete should be close or even similar to the concrete made with natural ingredients. The present research adopted an approach that consists of designing a series of low and normal strength with RCA having an equal target 28-day design strength to the corresponding natural aggregates concrete but while varying the water–cement ratios (w/c). Coarse recycled concrete aggregates, obtained by crushing waste concrete debris collected from different construction and demolition waste sources, were used in three different proportions of 30%, 50% and 100% (by weight) to produce new concrete with various w/c ratios and different compressive strength grades. Concrete mixes produced with general use Portland cement and various RCA contents were investigated in terms of their key mechanical and durability performances. The mechanical properties (crushing value) of the used RCA were visibly lower than the natural coarse aggregates (NCA). Thus, RCA-concrete showed lower performance than the NCA-concrete. It was found that by using up to 30% coarse RCA, the mechanical properties of concrete were not significantly affected. Beyond 30% of partial replacement of NCA by the coarse RCA, a continuing decrease in the mechanical performance with an increase in RCA amount was found. However, reducing the w/c ratio of concrete designed with the coarse RCA resulted in a compressive strength improvement, a better resistance to sulphate attack, carbonation, and chloride ion penetrations. Additionally, a proper design of Portland cement concrete produced with various proportions of RCA could also contribute to promoting sustainability in the construction industry and lowering its environmental impact.

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Section: Modulus Of Elasticitymentioning

confidence: 96%

Recycled Concrete Aggregates and Their Influences on Performances of Low and Normal Strength Concretes

2020

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“…Among the most used recycled materials in road engineering it can be found plastic [7,8], shredded tire rubber [9,10], foundry sand [11], glass [12], reclaimed asphalt pavements (RAP) [13,46], and metal-related tailings from mining industry. The latter counts many studies for the use of asbestos [14], coal [15], copper mine [16], iron and magnetic ore waste [17] as potential aggregates to enhance asphalt's mechanical behaviour and several other properties (e.g.…”

Section: Introductionmentioning

confidence: 99%

Shear rheology and microstructure of mining material-bitumen composites as filler replacement in asphalt mastics

Giustozzi

Mansour

Patti

et al. 2018

Construction and Building Materials

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“…e elasticity modulus of the concrete that used natural aggregate of N was higher than that of concrete that used recycled aggregates of N and S at the same strength conditions. In given priority to natural aggregate, the modulus of elasticity of the recycled concrete at the water to cement ratio of 0.53 was greater than that of concrete at the water to cement ratio of 0.47; since it was believed that compared to ordinary concrete, the elasticity modulus of recycled concrete is approximately 15-30% lower [26,27]. e research [28,29] has shown that void ratios and internal microcracks of mortar adhered lead to a low elasticity modulus of recycled concrete.…”

Section: Stress-strainmentioning

confidence: 99%

Effect of the Aggregate Size on Strength Properties of Recycled Aggregate Concrete

2018

Advances in Materials Science and Engineering

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e study on preparation technology of recycled concrete with economical and technical feasibility has gained more serious attention in each country due to its involvement and effect on the environment protection and the sustainable development of human society. In this study, we conducted a control variable test to investigate and assess the influence of the aggregate size on the strength characteristics of concrete with different diameters of recycled aggregates. Concrete with recycled aggregates of 5∼15 mm (A), 15∼20 mm (B), 20∼30 mm (C), and their combinations were subjected to a series of unconfined pressure tests after curing for 28 days. Based on the results obtained from the tests, an effort was made to study the relationship between the mechanical characteristics of recycled aggregate concrete and aggregate particle size. Also, a regression model of recycled concrete was proposed to predict the elasticity modulus and to adjust the design of mixture proportion. It is believed that these experiment results would contribute to adjust the remediation mixture for recycling plants by considering the influence of recycled aggregate size.

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Effect of Mixing Time and Temperature on Cracking Resistance of Bituminous Mixtures Containing Reclaimed Asphalt Pavement Material

Cited by 21 publications

References 11 publications

Recycled Concrete Aggregates and Their Influences on Performances of Low and Normal Strength Concretes

Recycled Concrete Aggregates and Their Influences on Performances of Low and Normal Strength Concretes

Shear rheology and microstructure of mining material-bitumen composites as filler replacement in asphalt mastics

Effect of the Aggregate Size on Strength Properties of Recycled Aggregate Concrete

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