Evaluation of Marshall Compactor Effect on the Degradation of Recycled Concrete Aggregate
Gailan Ismat Safa Eldeen,
Fauzan Mohd Jakarni,
Ratnasamy Muniandy,
Salihudin Hassim
Issue:
Volume 3, Issue 5, October 2018
Pages:
133-146
Received:
17 October 2018
Accepted:
14 November 2018
Published:
17 December 2018
Abstract: Demolishing structures presents the problem of disposing of crushed cement and concrete. This form of pollution is a cause for anxiety for environmental awareness agencies, inspiring the creation of more construction and structural policies and regulations that aim to address handling and disposing of crushed concrete. In place of throwing away crushed concrete, it ought to be reused. This study explores the feasibility of reusing crushed concrete in pavement construction applications, by adding it as substitute for aggregate in asphalt mixtures. The study focuses on the physical properties of crushed concrete and its degradation after the compaction of aggregates; in particular, it takes into account its absorption and abrasion qualities. The generally accepted advice is to mix crushed concrete with naturally sourced conventional aggregates. This study evaluated the suitability of variously proportioned and graded mixtures of conventional aggregates and Recycled Concrete Aggregate (RCA); six different proportions (0%, 20%, 40%, 60%, 80% and 100%) and five grades of crushed cement concrete were assessed using a 5 mm aggregate passing sieve and a 1.18 mm retaining sieve. The resulting mixtures were subjected to compaction of 20, 40, 60, 80 or 100 blows, using a Marshall Compactor. The results of the study reveal that the crushed concrete and the mixtures with the recommended ranges of sieve sizes and conventional aggregates are suitable for roads that have a medium volume of traffic.
Abstract: Demolishing structures presents the problem of disposing of crushed cement and concrete. This form of pollution is a cause for anxiety for environmental awareness agencies, inspiring the creation of more construction and structural policies and regulations that aim to address handling and disposing of crushed concrete. In place of throwing away cru...
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Subjective Experiment on the Habitability of a Temporary Emergency Shelter Made of Corrugated Cardboard
Takashi Nakaya,
Ryoichi Shibata
Issue:
Volume 3, Issue 5, October 2018
Pages:
147-153
Received:
18 September 2018
Accepted:
28 November 2018
Published:
21 December 2018
Abstract: In this study, we investigated indoor thermal environment survey and sleep in temporary shelters. Temporary shelters are three types of outdoor tents and cars, and newly developed temporary emergency shelter made corrugated cardboard. For each temporary shelter, indoor air temperature in summer and winter was measured. In summer, the corrugated shelter and the tent opened windows at night, so the indoor temperature and outside air temperature became the same level. As insects came in the car, it was difficult to open the window at night. In winter, the corrugated shelter and tent have the same level of indoor temperature and outdoor temperature. Because the airtight performance of the car is high, the lowest temperature in the room was maintained at around 10°C. Subject experiments of sleep were carried out on each temporary shelter using OSA sleep inventory.The subjective statements on the quality of sleep indicate that, in summer, the corrugated cardboard temporary shelter received the highest score, followed by the tent, and finally the automobile. In winter, the corrugated cardboard temporary shelter received the highest rating, followed by the automobile, and finally the tent. The Interview survey was conducted on each temporary shelter. The corrugated cardboard temporary shelter was evaluated highly for corrugated floor panels, the size of the space, the freedom of occupancy. The interior space of the car and the tent was narrow, it was difficult to stay for a long term, and it was a low evaluation.
Abstract: In this study, we investigated indoor thermal environment survey and sleep in temporary shelters. Temporary shelters are three types of outdoor tents and cars, and newly developed temporary emergency shelter made corrugated cardboard. For each temporary shelter, indoor air temperature in summer and winter was measured. In summer, the corrugated she...
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