A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
EXPERIMENTAL INVESTIGATION ON SUITABILITY OF RECYCLED AGGREGATE IN CONCRETE
A huge amount of solid waste is generated annually from construction and demolition activities. Depletion of natural resources and disposal of construction & demolition waste (CDW) related problems claim environmental threat. Good quality natural aggregates for concrete are becoming expensive and harder to obtain in some areas of Ethiopia, especially in Addis Ababa. These problems have led to the promotion of waste recycling as a major measure to reduce waste and to mitigate the harmful effects of construction activities on the environment. In order to reuse construction wastes, it is necessary to achieve basic concepts of assurance of safety and quality, decrease of environmental impact and increase of cost effectiveness of construction. In fact, the quality of recycled aggregate (RA) and recycled aggregate concrete (RAC) is less than that of normal aggregate (NA) or ordinary concrete due to the presence of a considerable proportion of mortar being linked to the NA. Assessment of recycled aggregate concrete (RAC) properties by laboratory tests is still required due to lack of precise guidelines and with taking into account slightly different behavior of such concretes in comparison with normal concretes. This research investigated the possible use of recycled aggregate collected from a demolished building (for renewal purpose) located at kality around bus station. Aggregate strength, gradation, absorption and specific gravity were studied to know the suitability of recycled aggregate in concrete. Cube specimens were made with 25%, 50%, 75% and 100% of recycled aggregate and investigated their compressive strength. The results were compared to that of a control mix made with normal aggregate. The results showed that concrete using the RA up to 50% can acquire sufficient quality and strength
EXPERIMENTAL INVESTIGATION ON SUITABILITY OF RECYCLED AGGREGATE IN CONCRETE
A huge amount of solid waste is generated annually from construction and demolition activities. Depletion of natural resources and disposal of construction & demolition waste (CDW) related problems claim environmental threat. Good quality natural aggregates for concrete are becoming expensive and harder to obtain in some areas of Ethiopia, especially in Addis Ababa. These problems have led to the promotion of waste recycling as a major measure to reduce waste and to mitigate the harmful effects of construction activities on the environment. In order to reuse construction wastes, it is necessary to achieve basic concepts of assurance of safety and quality, decrease of environmental impact and increase of cost effectiveness of construction. In fact, the quality of recycled aggregate (RA) and recycled aggregate concrete (RAC) is less than that of normal aggregate (NA) or ordinary concrete due to the presence of a considerable proportion of mortar being linked to the NA. Assessment of recycled aggregate concrete (RAC) properties by laboratory tests is still required due to lack of precise guidelines and with taking into account slightly different behavior of such concretes in comparison with normal concretes. This research investigated the possible use of recycled aggregate collected from a demolished building (for renewal purpose) located at kality around bus station. Aggregate strength, gradation, absorption and specific gravity were studied to know the suitability of recycled aggregate in concrete. Cube specimens were made with 25%, 50%, 75% and 100% of recycled aggregate and investigated their compressive strength. The results were compared to that of a control mix made with normal aggregate. The results showed that concrete using the RA up to 50% can acquire sufficient quality and strength
EXPERIMENTAL INVESTIGATION ON SUITABILITY OF RECYCLED AGGREGATE IN CONCRETE
NEGASH MEHAMMED SEID (author)
2019-05-23
doi:10.20372/nadre/3906
Theses
Electronic Resource
English
DDC:
690
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