FARU - 2018

Permanent URI for this collectionhttp://192.248.9.226/handle/123/14716

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Browsing FARU - 2018 by Author "Chandra, MS"

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    Effectiveness of a discretely supported slab insulation system in terms of thermal performance
    (2018) Nandapala, K; Chandra, MS; Halwatura, RU; Samarawickrama, S.
    One of the main issues of the thermal discomfort inside buildings is heat gain from building envelope. As a remedy, active cooling solutions such as air conditioners are commonly used. But that can never be admired owing to the contribution of excessive energy usage and environmental pollution. Hence, passive cooling solutions such as building thermal insulation can be taken as a fruitful solution. Since about 70% of heat gain of buildings occur through roofs, thermal insulation of roofs takes a prominent place in the aforesaid matter. As a result of rapid urbanization and population growth, the amount of usable land for building constructions is very low and the constructions have to be done on a very limited space. There, flat concrete roofs provide additional working spaces and the possibility of future vertical developments with other benefits such as extra robustness and the cyclonic resistance to the structures. Anyhow, utilization of flat concrete roofs is unpopular due to the thermal discomfort in the immediate space beneath. Addressing this drawback of ordinary flat concrete roofs, a new roof slab insulation system introduced having the capability of achieving more than 75% of heat gain reduction. Thermal performance comparison between the novel system and existing roof slabs confirmed the effectiveness of the new system. Further, 50mm thick vegetation was added on top of the novel slab system and thermal performance was compared. Results showed 20% of peak cooling load reduction from new slab system and 21% of peak cooling load reduction in a summer day under tropical conditions when it was vegetated.
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    Experimental investigation on the optimal lifting height of a self-compacting in-situ cast mud-concrete load-bearing wall segment
    (2018) Arooz, FR; Perera, KLTH; Chandra, MS; Halwatura, RU; Samarawickrama, S
    Initial objective of this research is investigating the optimum lifting height of a wall segment of self-compacting in-situ cast Mud-Concrete load bearing walls. It is a novel walling technique which has been developed through series of research process in Sri Lanka. Thus, identifying the possible construction height of a Mud- Concrete wall without reducing the strength is very important when introducing a novel material to industry and popularizing the technique among public. A questionnaire survey was conducted among 400 construction workers to identify the comfortable pouring height of an in-situ cast wall segment prior to design the formwork and it was found as 1200mm height. Using the results, 1200mm x 1200mm (height x width) and 150 mm thick of Mud-Concrete wall was casted and drilled after 28 days to test the compressive strength of cored samples along four different heights of the wall. According to the results obtained, increasing the height of the Mud-Concrete wall does not reduce the compressive strength of the wall. Therefore, study concludes that, there is no height restriction in construction of a Mud-Concrete wall. However, 1200mm of comfortable lifting height is consider as the optimum lifting height of a wall segment and used the results in modular formwork fabrication.