Investigating the Possibility of Constructing Low Cost Roller Compacted Concrete Dam.
Abu-Khashaba, M., Adam, I., El-Ashaal, A. (2020). Investigating the Possibility of Constructing Low Cost Roller Compacted Concrete Dam.. EKB Journal Management System, 38(4), 15-32. doi: 10.21608/bfemu.2020.103824
Mohamed I. Abu-Khashaba; I. Adam; A. El-Ashaal. "Investigating the Possibility of Constructing Low Cost Roller Compacted Concrete Dam.". EKB Journal Management System, 38, 4, 2020, 15-32. doi: 10.21608/bfemu.2020.103824
Abu-Khashaba, M., Adam, I., El-Ashaal, A. (2020). 'Investigating the Possibility of Constructing Low Cost Roller Compacted Concrete Dam.', EKB Journal Management System, 38(4), pp. 15-32. doi: 10.21608/bfemu.2020.103824
Abu-Khashaba, M., Adam, I., El-Ashaal, A. Investigating the Possibility of Constructing Low Cost Roller Compacted Concrete Dam.. EKB Journal Management System, 2020; 38(4): 15-32. doi: 10.21608/bfemu.2020.103824

Investigating the Possibility of Constructing Low Cost Roller Compacted Concrete Dam.

MEJ- Mansoura Engineering Journal
Article 9, Volume 38, Issue 4, December 2013, Page 15-32  XML PDF (4.13 MB)
Document Type: Research Studies
DOI: 10.21608/bfemu.2020.103824
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Authors
Mohamed I. Abu-Khashaba* 1; I. Adam2; A. El-Ashaal3
1Associate professor, Construction Research Institute, National Water Research Center, Delta Barrages, 13621, Egypt
2Professor and Deputy-Director of Construction Research Institute, National Water Research Center, Delta Barrages, 13621, Egypt.
3Professor and Director of Construction Research Institute, National Water Research Center, Delta Barrages, 13621, Egypt.
Abstract
The design, and sequences for construction with Roller Compacted Concrete Dams, “RCCD” are considerably different from conventional mass concrete construction. This paper describes design mixes, model construction, monitoring system and thermal measurements analysis for RCCD constructed using the available low cost local materials. Trial laboratory concrete mixtures were conducted to define the best different RCCD proportions in the first stage.  Twelve mixtures with fly ash of different cement replacement percentages (0%, 50%, and 60%) divided into two groups, each one includes six concrete mixtures that were designed with water/cementitious materials ratio, w/cm of 1.0 and 0.9 for the first and second group respectively, two contents of cement of 150 kg/m3 and 120 kg/m3 were also examined. Tests were performed for determining fresh and hardened concrete properties.  In the second stage, based on the laboratory results, RCCD model was then constructed.  Descriptions of all construction stages, different instrumentations installed for dam monitoring system and temperature measurements results are also conducted and presented in this research. Test results clarify how fly ash interacts with Portland cement; its effects on the fresh and hardened concrete properties; and how RCCD thermal analysis is affected and proportioned with fly ash.  Fly ash, due to its pozzolanic and cementitious properties, is a suitable replacement material for cement to reduce cement usage without invading concrete properties and can contribute to strength gain and may improve performance of fresh and hardened concrete.  By using natural pozzolans, fly ash, in the massive concrete dam construction, it is possible to achieve a reduction of the temperature rise without any undesirable effects such as  bleeding,  tendency  to segregate, and  tendency to increase permeability. It also reduces the thermal stresses by reducing the heat of hydration. The obtained results indicated that RCC could be effectively produced using the available local Egyptian materials.
Keywords
Roller Compacted Concrete Dams; “RCCD”; Design Mixes; Model Construction Stages; Monitoring System; Thermal Measurements; Low Cost Local Materials; and Fly Ash
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