Roller Compacted Concrete with Recycled Concrete Aggregate for Paving Bases

Hedelvan Emerson Fardin,Adriana Goulart Dos Santos

doi:10.3390/su12083154

Hedelvan Emerson Fardin, Adriana Goulart Dos Santos

Open Access

https://doi.org/10.3390/su12083154

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Journal: Sustainability	Publication Date: Apr 14, 2020
Citations: 24	License type: CC BY 4.0

Affiliation: Universidade do Estado de Santa Catarina

Abstract

This research aimed to investigate the mechanical and physical properties of Roller Compacted Concrete (RCC) used with Recycled Concrete Aggregate (RCA) as a replacement for natural coarse aggregate. The maximum dry density method was adopted to prepare RCC mixtures with 200 kg/m³ of cement content and coarse natural aggregates in the concrete mixture. Four RCC mixtures were produced from different RCA incorporation ratios (0%, 5%, 15%, and 30%). The compaction test, compressive strength, splitting tensile strength, flexural tensile strength, and modulus of elasticity, porosity, density, and water absorption tests were performed to analyze the mechanical and physical properties of the mixtures. One-way Analysis of Variance (ANOVA) was used to identify the influences of RCA on RCC’s mechanical properties. As RCA increased in mixtures, some mechanical properties were observed to decrease, such as modulus of elasticity, but the same was not observed in the splitting tensile strength. All RCCs displayed compressive strength greater than 15.0 MPa at 28 days, splitting tensile strength above 1.9 MPa, flexural tensile strength above 2.9 MPa, and modulus of elasticity above 19.0 GPa. According to Brazilian standards, the RCA added to RCC could be used for base layers.

Highlights

According to Balbo and Dornelas [1], Brazil has faced an annunciated transport crisis since the 1980s
The splitting tensile strength reduced by 8.3% and 26.0% for Roller Compacted Concrete (RCC) with 50% and 100% of Recycled Concrete Aggregate (RCA) compared to RCC with Natural Aggregates (NA) [8]
This research study presents the results of an investigation on RCA added to RCC with an incorporation ratio of 0%, 5%, 15%, and 30%

Summary

Introduction

According to Balbo and Dornelas [1], Brazil has faced an annunciated transport crisis since the 1980s. There is around 1,720,700 km of roads in the country, but just 12.4% are paved, 78.5% are unpaved, and 9.1% are in the planning phase [2]. A considerable amount of materials is necessary to improve the Brazilian transport infrastructure, just like any other country investing in paving projects. The extraction of natural materials as aggregates requires several environmental permits because this procedure causes damage to the environment, and highway construction consumes a finite resource on our planet. Improving the infrastructure of highways without causing severe environmental damages, the use of Construction and Demolition Waste (CDW) could be an alternative to reduce the volume of NA and concomitantly reduce illegally dumped waste in urban areas improper for handling it, such as areas nearby creeks and roads [3,4]

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