Effect of recycled coarse aggregate on the new interfacial transition zone concrete

Djerbi, Assia

doi:10.1016/j.conbuildmat.2018.09.180

Cited by 106 publications

(30 citation statements)

References 23 publications

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“…A high water/cement (W/C) ratio may result in low matrix strength and poor ITZ and consequently reduced tensile strength of the concrete. As reported by Djerbi [40] , when the RCAs used in the pre-saturation state influence the ITZ of RAC, the water contained in the pores of RCAs will migrate towards the new paste, affecting its microstructure (new ITZ). This mechanism induces additional porosity in RAC.…”

Section: A N U S C R I P Tmentioning

confidence: 86%

Mechanical and durability properties of concrete based on recycled coarse and fine aggregates produced from demolished concrete

Berredjem

Arabi

Molez

2020

Construction and Building Materials

103

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Section: A N U S C R I P Tmentioning

confidence: 86%

Mechanical and durability properties of concrete based on recycled coarse and fine aggregates produced from demolished concrete

Berredjem

Arabi

Molez

2020

Construction and Building Materials

103

View full text Add to dashboard Cite

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“…Compared with natural coarse aggregate, RCA has higher crushing index, larger water absorption rate, and lower apparent density [11,12]. Microexperiments were carried out to analyze the reasons for these differences [13,14]. Some studies also have shown that the cement kilns, fly ash, etc.…”

Section: Introductionmentioning

confidence: 99%

Performance Evaluation of Strengthening Recycled Coarse Aggregate in Cement Stabilized Mixture Base Layer of Pavement

Zhang

Ding

et al. 2020

Advances in Civil Engineering

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This paper attempts to study the effect of different strengthening methods on recycled coarse aggregate (RCA) reprocessed from construction and demolition (C&D) waste. And it aims to obtain the optimal RCA content in cement stabilized recycled mixture (CSRM) applied in the base layer of pavement. Firstly, three strengthening methods were used to strengthen the RCA. It was revealed that the sodium silicate solution is the best method in a strengthening concentration of 8% and strengthening for five hours. Then, the mechanical experiments under two cement dosages, including unconfined compressive strength, splitting strength, and compressive rebound modulus tests, were carried out. In each cement dosage, five different RCA contents (0%, 25%, 50%, 75%, and 100%) were considered. It was found that, at 5% of cement dosage, the strength of CSRM satisfied the requirements of the base layer of the expressway under heavy traffic load. In the case of 4% of cement dosage, the strength of CSRM which was beyond 50% of RCA content was failed to meet specification requirements. For the failed cases, by strengthening RCA in the best method obtained before, 7 d unconfined strength and crushing value of the CSRM with 50% RCA content could meet the requirements of the subbase of expressways and first-class highways in China; the 75% of the mixture meets the requirements of the second-class highways and below.

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“…For this reason appropriate curing conditions of RAC seems to be more important than in the case of ordinary concrete, especially because of the different characteristics of their interfacial transition zones [24][25][26].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Curing Conditions on Selected Properties of Recycled Aggregate Concrete

Grabiec¹,

Zawal²,

Rasaq³

2020

Preprint

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The paper presents the influence of different curing conditions – wet, dry and protection against water evaporation on selected properties of concretes with different amount of recycled concrete aggregate previously subjected to atmospheric CO2 sequestration. Additionally, the eco-efficiency bi and ci indexes as well as eco-durability S-CO2 index were calculated. It was found that dry conditions deteriorate the properties of concrete, especially made of blast furnace slag cement, while protection against evaporation allows to achieve results comparable to wet conditions. Moreover, for series with the highest amount of coarse recycled aggregate and after longer period of curing, the difference between the effects of wet curing and protection against water evaporation disappears. The eco-efficiency and eco-durability indexes approach confirms the beneficial effect of blast-furnace slag cement used as a binder but on condition of proper way of curing.

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Effect of recycled coarse aggregate on the new interfacial transition zone concrete

Cited by 106 publications

References 23 publications

Mechanical and durability properties of concrete based on recycled coarse and fine aggregates produced from demolished concrete

Mechanical and durability properties of concrete based on recycled coarse and fine aggregates produced from demolished concrete

Performance Evaluation of Strengthening Recycled Coarse Aggregate in Cement Stabilized Mixture Base Layer of Pavement

The Effect of Curing Conditions on Selected Properties of Recycled Aggregate Concrete

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