Effect of Different Mud Brick Moulds and Mortar on Durability of Plaster Materials of Buildings
Publication Date : 07/08/2019
This study evaluates two different plastering materials for mud buildings. The mud was first mixed with water and treaded upon. Straw was added as stabilizers to the mud paste. A little amount of straw spread on the surface of the mixture was remixed and left for a period of one week in which the mixture was remixed at interval of three days. The moisture content of the mud paste samples were determined using oven drying method with oven temperature at 105oC. Mud bricks were produced from two types of moulds made from wood and steel with 450 x 225 x 225 mm dimensions. Compression strength test using the hydraulic compression test machine were also performed on the two samples of bricks from each batch and each type of mould used. Eight different walls produced from the bricks were coated with two types of rendering materials. The first four walls have mud mortar with plaster varied with mud and sandcrete for wood and steel moulded bricks respectively. The last four have sandcrete mortar, with variation in the brick type and plaster. The walls were observed for changes due to environmental or weather conditions to note the extent of degradation and also tearing which could be on both sides of the walls. Cracks on the walls were measured by the use of thread while the wall strengths test was done by the use of rebound hammer method. The results show that walls constructed with steel moulded bricks, bounded with mud mortar and plastered with sandcrete gives the highest strength, while that constructed with wooden mould bounded with sandcrete mortar and plastered with sandcrete gives the least strength. Also, the walls constructed with steel moulded bricks, bounded with mud mortar and plastered with sandcrete gives the least amounts of cracks, while that constructed with wooden moulded bricks, bounded with sandcrete mortar and plastered with sandcrete gives the highest amount of cracks.
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