Abstract
Abstract The problem related to the generation of construction and demolition waste (CDW) is directly associated with its high volume and irregular disposal, especially when such waste is disposed of in landfills. Therefore, it is increasingly important to encourage the reuse of this material, especially in large-scale projects. However, the use of this waste depends on the different constituent materials, which show a wide variability. Within this context, the objective of this work was to study the mechanical performance of construction and demolition waste over time aiming at the use in pavement support layers. Two samples were evaluated, one composed exclusively of construction waste (CDW_1) and the other composed of a soil-waste mixture (S_CDW), with 50% of each material. The tests evaluated the strength of the materials over a curing period from 0 to 224 days. The results clearly indicate an increase in strength and stiffness over time. The CDW_1 samples indicated a more significant increase. The analyses indicated that this behavior occurs due to the effect of self-cementing properties that occur in this type of waste. The results indicate a benefit in terms of strength when using this type of waste either alone or mixed with soil.
Highlights
The generation of construction and demolition waste (CDW) has become problematic in urban centers, due to the associated scarcity of disposal sites, the adoption of inefficient, management measures, as well as problems of public sanitation and environmental contamination often caused by irregular disposal
The influence on mechanical behavior due to the self-cementing effect of these materials can be evaluated, for example, based on the determination of the change in the resilient modulus and unconfined compressive strength over time (BLANKENAGEL, 2005). This self-cementing effect is associated with the physical characteristics and the chemical and mineralogical composition of the waste material, since it is composed of different types of materials that can influence its behavior with respect to its mechanical strength, water absorption and density (GÓMEZ, 2011)
The increase in stiffness over time can be attributed to the presence of non-hydrated cement, again demonstrating the self-cementing behavior characteristic of construction and demolition waste due to the addition of water that provides the occurrence of new reactions in non-inert particles
Summary
The generation of construction and demolition waste (CDW) has become problematic in urban centers, due to the associated scarcity of disposal sites, the adoption of inefficient, management measures, as well as problems of public sanitation and environmental contamination often caused by irregular disposal. The results indicate that samples of CDW, composed exclusively of concrete and cementitious mortar, show a more pronounced rate of increase in strength over time.
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