Recycled concrete aggregate as a road base material

Abstract

Natural crushed aggregate (NCA) is the most common material for aggregate throughout the world. The consumption of the NCA itself is rising up through the years. Concrete structures and road construction are some of the most consuming aggregate material, especially NCA. Therefore, aggregate such as recycled concrete aggregate (RCA) has become an alternative material for some particular civil construction. The implementation of RCA as road construction material has been raised for a long time ago especially in road base layer. Road base layer as foundation for road pavement must provide an adequate strength to hold the working load on the pavement surface. RCA is more heterogeneous material compared to NCA as the RCA contain many substances, such as aggregate, cement, sand, and some additive substances. Hence, it effects the strength of the RCA as construction material. In this paper, the properties of the RCA are investigated to get the characteristic of the aggregate. Density, water absorption, aggregate crushing value (ACV), compaction, and penetration test (CBR) were conducted in this research. An improvement by using plastic strips as addition also proposed to strengthen the RCA as road base material.

The Analysis of Stress Distribution on the Physical Model of Road Base Layer

“…Different mixtures of concrete will affect the properties of RCA even for a small difference, especially for the physical properties. In this research previously, the RCA has a specific gravity (SSD) of 2,420 kg/m 3 [13] while research from Bhuiyan shows a slightly different value of about 2,480 kg/m 3 [15]. A slightly different result also occurs in water absorption.…”

“…The static load tests were conducted in Highway and Transportation Laboratory of Civil Engineering, Universiti Teknologi Malaysia. Some properties were given from previous research such as specific gravity, water absorption, maximum dry density (MDD), and optimum moisture content (OMC) [13]. Sub-base and subgrade were not the main focus on this research, hence, the parameter taken from those only the California Bearing Ratio (CBR) value as the representative for compacted material strength.…”

“…The Malaysian Department of Public Works has stated that there are seven quality requirements for road base material in Standard Specification for Road Works Section 4 [8]. Previous research has conducted some properties tests [13] and some repeated tests also been conducted to obtain better data. The results are provided in Table 1 and Error!…”

Effect of Dispersed Reinforcement on Ultrasonic Pulse Velocity in Stabilized Soil

“…The first method is based on the reuse of materials from the demolition of concrete structures. Recycled concrete aggregate (RCA) is increasingly used in highway construction, which is the subject of numerous scientific studies [13][14][15][16][17][18]. A second important research direction is the use of soil reinforcement.…”

Experiment on Size Effect and Fractal Characteristics of Waste Brick and Concrete Recycled Aggregate

“…Recycled aggregate differs from natural sand and gravel because the recycled aggregate produces a greater crushing effect when subjected to low loading. Particle crushing leads to a change in the recycled aggregate gradation, affects the thickness and fineness proportion, alters the overall structure of recycled aggregate, and influences the recycled aggregate's strength and mechanical deformation properties [5][6][7][8].…”