Roller Compacted Concrete with Recycled Concrete Aggregate for Paving Bases

Fardin, Hedelvan Emerson; Santos, Adriana Goulart dos

doi:10.3390/su12083154

Cited by 28 publications

(14 citation statements)

References 24 publications

(93 reference statements)

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“…It can be revealed that dense gradation exhibits lower porosity than gap gradation. Such finding does not match with the results reported by Fardin and Santos, [3]. It can be observed that dense gradation exhibits higher intercept value of 57.3 % than that of gap gradation.…”

Section: Porositycontrasting

confidence: 85%

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Correlating the Durability Properties of Roller Compacted Concrete

Sarsam¹

2021

CEBACOM

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Roller compacted concrete is the zero-slump concrete mixture, usually prepared at low cement content and low workability, and subjected to compaction by rollers to increase the density and improve the aggregate particles interlock. It is recommended for heavy duty pavement and can withstand harsh environment. Modeling the physical behavior of roller compacted concrete exhibits a quick and easy start to predict the future behavior of the material. In the present assessment, roller compacted concrete mixtures have been prepared in the laboratory using three percentages of Portland cement (10, 12, and 16) % to simulate low, medium, and high cement content from roller compacted concrete point of view. The mixtures were poured into the cylinder mold of 101.6 mm diameter and 116.4 mm height in five successive layers. Each layer had practiced 25 blows of the modified Proctor hammer with 4.5 kg weight, falling from 450 mm height. Specimens were withdrawn from the mold after 24 hours and cured for 28 days in a water bath at 20°C. Specimens were subjected to bulk density, absorption, and porosity determination. Test results were analyzed and modeled. It can be observed that the gradation of aggregates (dense or gap)does not exhibit a significant issue in the absorption-density relationship. However, Dense gradation exhibits lower porosity than gap gradation. It can be concluded that the obtained mathematical models may be implemented to predict the relationship between the durability parameters of roller compacted concrete in terms of porosity, absorption, and density with high coefficients of determination.

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Section: Porositycontrasting

confidence: 85%

“…However, no meaningful correlation was found between the dry density and capillary absorption coefficient. Fardin and Santos, [3] implemented the maximum dry density method to prepare roller compacted concrete mixtures with 200 kg/m3 of cement content. Four mixtures were produced with recycled coarse aggregates ratios (0, 5, 15, and 30) %.…”

Section: Introductionmentioning

confidence: 99%

Correlating the Durability Properties of Roller Compacted Concrete

Sarsam¹

2021

CEBACOM

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“…However, the presence of low-density porous adhered mortar (AM) around RCA could significantly affect the compactness, and thus, the aggregate interlocking capacity of RCCP; the compactness is usually determined by maximum dry density (MDD) and Vebe density. Based on the available literature, it is confirmed that the density of these hybrid mixtures could be lower than conventional RCCP in the range of 2.2% to 4.7% because of AM ( 7 , 13 , 14 ). Also, the water demand for these mixtures could be 8.3% to 35% higher than conventional mixtures for coarse RCA inclusion ( 7 , 13 , 14 ).…”

mentioning

confidence: 83%

Enhancing the Performance of Roller-Compacted Concrete Pavement by Synergetic Improvement of Packing Density, Lubrication, and Moisture State of Recycled Concrete Aggregate

Selvam

Singh

Anjana

2023

Transportation Research Record: Journal of the Transportation R

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Roller-compacted concrete pavement (RCCP) is considered superior to other pavement types with reference to cost, ease of construction, and performance. However, the aggregate demand is significantly higher in RCCP than in the conventional concrete pavement. It is predicted that natural minable limestone sources would be exhausted in India in the next 30 to 40 years. One way to reduce the natural aggregates (NA) requirements in RCCP is through the integration of recycled concrete aggregates (RCA). However, the physical property of RCA is significantly inferior to that of NA owing to the presence of adhered mortar (AM), which increases the water demand by 2.3 to 4.6 times and affects the compactness and hardened-state behavior of RCCP. This study has tried to enhance the compactness and improve the performance of RCCP containing RCA (coarse, fine, and total RCAs) through different synergetic approaches. This, in turn, enhances the interlocking capacity using the particle packing approach, followed by mitigating the negative effects of AM by altering the moisture states, then improving the compactability and lubricating the matrix with superplasticizers. The results depict that altering the moisture states alone could adversely affect the RCCP performance because of the moisture transfer mechanism from the hydraulic gradient. Moreover, the inclusion of superplasticizers in different moisture states could manifest better aggregate rearrangement and compactability. Further, it could improve the tensile behavior of the RCCP compared with the concrete containing NA. These findings favor the complete replacement of NA by RCA for low-volume rural road construction.

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“…Repurposing structural components to produce "new" items is difficult. Therefore, researchers are exploring approaches to repurpose recycled concrete including as construction materials e.g., [33][34][35], and geotechnical applications e.g., [36][37][38]. However, consumers may be hesitant to use these materials and applications because the minimum specifications have not been met.…”

Section: Low Demand For Recycled Concretementioning

confidence: 99%

Main Challenges to Concrete Recycling in Practice

et al. 2021

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While concrete recycling is crucial to protecting the environment, its implementation in practice is low in many countries. This study aims to highlight challenges to concrete recycling. To achieve that aim, the study objectives are (1) to identify the main challenges to concrete recycling in construction projects; (2) to compare the main challenges between small–medium enterprises (SMEs) and large enterprises (LEs); and (3) to determine the underlying groups among the main challenges. Potential challenges were identified through a systematic literature review of journal articles and semi-structured interviews with fifteen industry practitioners. Then, the identified challenges were inserted into a questionnaire survey and distributed to industry practitioners. Eighty-nine valid responses were collected and analyzed using the mean score ranking, normalization, agreement analysis, and factor analysis techniques. The analyses show thirteen main challenges to concrete recycling. The main challenges include increased project duration, lack of national programs, lack of comprehensive rules and regulations, increased project cost, low demand for recycled concrete, low cost-effectiveness of concrete recycling, and increased transportation cost. However, there is no consensus on the criticality between SMEs and LEs. For example, increased project cost is the main challenge for SMEs but is only middlingly ranked for LEs. Finally, the main challenges can be categorized into three interrelated groups: people and technical, legal and environmental, and economic challenges. This study contributes to the literature by analyzing challenges that hinder concrete recycling in practice. The findings allow researchers and practitioners to develop strategies to reduce concrete recycling rejection.

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Roller Compacted Concrete with Recycled Concrete Aggregate for Paving Bases

Cited by 28 publications

References 24 publications

Correlating the Durability Properties of Roller Compacted Concrete

Correlating the Durability Properties of Roller Compacted Concrete

Enhancing the Performance of Roller-Compacted Concrete Pavement by Synergetic Improvement of Packing Density, Lubrication, and Moisture State of Recycled Concrete Aggregate

Main Challenges to Concrete Recycling in Practice

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