Abstract
In quest for quality and sustainable development, it is necessary to find alternative materials, methods of brick making and house design. Bricks made in open kilns using locally available materials usually do not meet the requirements of the South African Bureau of Standards; hence it needs to add some ingredients such as fly ash to produce better quality bricks. This paper reports the effects of fly ash on properties of clay bricks that can improve the thermal performance of buildings. Bricks of different clay and fly ash mixing proportions were molded. A passive solar house was designed and constructed using fly ash bricks. Results indicate that thermal conductivity and water absorption decrease with increase in fly ash. Compressive strength was found to in-creases with increase in amount of fly ash. A mixing proportion of 50% of fly ash to 50% clay by volume produced a brick with the highest compressive strength, lowest thermal conductivity and minimum water absorption. The bricks were observed to have uniform size as they experience minimal burning shrinkage. These properties were found to have a significant impact on the thermal performance of the house. The mean indoor temperature swing was found to be 11°C.
Highlights
In spite of being cheap, the locally made bricks possess some grave disadvantages, i.e. high water absorption, How to cite this paper: Makaka, G. (2014) Influence of Fly Ash on Brick Properties and the Impact of Fly Ash Brick Walls on the Indoor Thermal Comfort for Passive Solar Energy Efficient House
This paper investigates the effects of fly ash on brick properties and the thermal comfort of a passive solar fly ash brick house
Class C fly ash generally contains more than 20% lime (CaO) [2]
Summary
In spite of being cheap, the locally made bricks possess some grave disadvantages, i.e. high water absorption, How to cite this paper: Makaka, G. (2014) Influence of Fly Ash on Brick Properties and the Impact of Fly Ash Brick Walls on the Indoor Thermal Comfort for Passive Solar Energy Efficient House. (2014) Influence of Fly Ash on Brick Properties and the Impact of Fly Ash Brick Walls on the Indoor Thermal Comfort for Passive Solar Energy Efficient House. The aim is to decrease these disadvantageous characteristics Simple intervention such as north orientation (in the southern hemisphere) of the house and placement of bigger windows on the north wall plays a crucial role in creating a more comfortable indoor environment [1]. Bricks with low thermal conductivity, low water absorption, high compressive strength and high sound damping are most preferable. This paper investigates the effects of fly ash on brick properties and the thermal comfort of a passive solar fly ash brick house. The burning of harder, older anthracite and bituminous coal typically produces Class F fly ash. Fly ash produced from the burning of younger lignite or sub-bituminous coal, has some self-cementing properties. Class C fly ash generally contains more than 20% lime (CaO) [2]
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