Strength and stiffness of concrete with recycled concrete aggregates

McGinnis, Michael J.; Davis, Mark M.; Rosa, Andrés de la; Weldon, Brad D.; Kurama, Yahya C.

doi:10.1016/j.conbuildmat.2017.07.015

Cited by 130 publications

(47 citation statements)

References 16 publications

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“…The aim of the first trial mix is to determine the effects of coarse RA on the workability of concrete as it has been reported in the literature that the incorporation of RCA has negatively affected the concrete workability . The aim of the second trial mix is to determine the effects of coarse RA on the compressive strength of concrete since incorporation of RCA negatively influences the concrete compressive strength …”

Section: Concrete Experimental Programmentioning

confidence: 99%

“…In addition, concrete mixtures containing RCA is generally observed to have a lower compressive strength than concrete mixtures containing only NA . Generally, it is reported that the compressive strength of concrete containing RCA decreases with increasing replacement of NA with RCA . It has been observed that there is negligible strength loss for concrete containing up to 30% RCA.…”

Section: Introductionmentioning

confidence: 99%

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Investigation on properties of coarse reclaimed aggregates and their effects on concrete strength and workability

Far

2019

Structural Concrete

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Section: Concrete Experimental Programmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation on properties of coarse reclaimed aggregates and their effects on concrete strength and workability

Far

2019

Structural Concrete

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“…The structure becomes rough, porous and irregular, and the surface of recycled aggregate adheres to 30–35% of the volume of old cement paste . Mechanical properties, such as compressive strength, splitting tensile strength, flexural strength, and stiffness, of recycled aggregate concrete (RAC) have a negative correlation with the increasing replacement level of natural aggregates. Silva et al, stated that RAC specimens show higher creep than natural aggregate concrete (NAC) due to the high porosity of the former that results in a high water loss to the environment.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of microcracks in the interfacial transition zone of recycled rubber concrete

Wang

2019

Structural Concrete

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This work focuses on the feasibility of recycling waste tire rubber aggregates into recycled concrete. The performance of interface transition zone (ITZ) is a key factor affecting the mechanical properties and durability of concrete. The influence of rubber particle size (5-10, 10-20, 20-50, and 50-90 mesh) and volume fraction of rubber aggregate (0, 10, and 20%) on the ITZ of common and rubber aggregatecement pastes was studied. Scanning electron microscopy was used to observe the microstructure of recycled rubber concrete cured at constant temperature and humidity for 28 days. Moreover, the size of microcracks in the ITZ area was evaluated. Results showed that the crack width of the ITZ between the rubber and cement paste (ITZ-R) and between the ordinary aggregate and cement paste (ITZ-S) showed similar variation patterns. The addition of 50-90 mesh rubber powder improved the ITZ micro-crack structure of rubber concrete. Increasing the rubber content and particle size also increased the microcrack width of ITZ. The size of rubber aggregate was the key factor affecting the crack width in ITZ. Finally, the addition of rubber inhibited the hydration degree of cement, reduced the formation of hydration products in ITZ and substantially affected ITZ-R. K E Y W O R D Sinterfacial transition zone, microcracks, recycled rubber concrete, scanning electron microscopy

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“…In the available studies, using reclaimed asphalt pavement is limited to adding recycled concrete aggregate (RCA) to cement concrete as a substitute for new aggregate. Research in this regard was carried out by many researchers [15][16][17][18]. The structure of RCA limits its possible applications in hot mix asphalt.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of the complex modulus of recycled cold mix with foamed bitumen and recycled concrete aggregate

Buczyński

Iwański

2019

MATEC Web Conf.

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This article presents research on recycled cold mix with foamed bitumen (MCAS) containing recycled concrete aggregate. The primary concept driving this research was to determine if recycled concrete aggregate (RC) could be used as a substitute for reclaimed asphalt pavement (RAP). Recycled concrete aggregate was used in the MCAS mix in amounts ranging from 20%, 60% and 80%. The reference mix was the MCAS mix containing 50% reclaimed asphalt pavement (RAP) and virgin aggregate. Identical 0/31.5-mm continuously graded dolomite virgin aggregate was used in all mixes. 2.5% foamed bitumen (FB) and 2.0% CEM I 42.5R Portland cement (PC) were used to increase the cohesion of the mineral mix. Foamed bitumen was produced from 50/70 penetration paving bitumen. The behaviour of the recycled base course was tested in the range of cyclic sinusoidal strain with amplitude εo = 25–50 με. The tests were carried out in the (-7°C, 5°C, 13°C, 25°C, 40°C) temperature and (0.1 Hz, 0.3 Hz, 1 Hz, 3 Hz, 10 Hz, 20 Hz) loading time range. The complex modulus was tested in a direct tension-compression test on cylindrical samples (DTC-CY) in accordance with EN 12697-26. The results of the tests were used to assess the complex modulus (E*), phase angle (φ) and complex modulus components (E1) and (E2).Tests of the mixes indicate that recycled concrete aggregate can be used in recycled cold mixes in amounts of up to 80%. Increasing the amount of recycled concrete aggregate does not cause excessive stiffness of the recycled mix in comparison with the reference mix. The tests did not demonstrate a significant difference in terms of the phase angle (φ), which indicates a similar content of the viscous part and elastic part in the obtained complex modulus for the reference mix (RAP + MCAS) and the mix containing recycled concrete aggregate (RC + MCAS).

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Strength and stiffness of concrete with recycled concrete aggregates

Cited by 130 publications

References 16 publications

Investigation on properties of coarse reclaimed aggregates and their effects on concrete strength and workability

Investigation on properties of coarse reclaimed aggregates and their effects on concrete strength and workability

Evaluation of microcracks in the interfacial transition zone of recycled rubber concrete

Characteristics of the complex modulus of recycled cold mix with foamed bitumen and recycled concrete aggregate

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