Building materials
Walls
• Stone - rough hewn (rubble) or worked smooth (ashlar) blocks; the former being cheaper to produce while much less mortar is needed with the latter if they are well-finished • Stabilised soil blocks - now a proven low cost technology, especially in areas where soil of low shrinkage - which requires less use of costly stabiliser, is available locally • Rammed earth or pisé - alow cost material, though stabiliser might need to be added to control cracking, but labour-intensive and heavy to work with. The earth wall is built up between shutters or formwork that are progressively moved up the wall as construction proceeds. Use of internal and external plastering preferred with rammed earth buildings to reduce the need for maintenance, which is otherwise high, and theharbouring of insects and other pests. • Fired clay bricks - requires a higher level of skill for laying than the larger blocks, also in some cases field bricks might be warped and of variable size, so relatively large quantities of mortar are required • Concrete blocks - usually hollow rather than completely solid blocks are used as this allows some saving on the material for the blockmaker with thesame level of structural stability as solid blocks. Blocks can be used structural or loadbearing, or used for infill. The strength and durability requirements of blocks for structural use need to be considerably higher than those for infill • Precast concrete panels - panels are inserted within a structural frame and bolted with each other and the frame. Panels contain steel reinforcement, whichincreases the cost. However costs can be reduced by mass fabrication, so the application of pre-fabrication would be likely to be most relevant to very large building programmes with many identical or modular constructions. Prefabricated components do not require high levels of skill to erect, and erection can be relatively fast so having a low labour requirement - rarely a priority in many...
Regístrate para leer el documento completo.