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Barriers may be a coating or membrane applied to the exterior of the concrete. The coating may be asphalt, asphalt emulsion, a thinned asphalt called cutback asphalt, or an elastomer. [9] Membranes are rubberized asphalt or EPDM rubber. Rubberized products perform better because concrete sometimes develops cracks and the barrier does not crack ...
Weeping tile is a porous plastic drain pipe installed around the perimeter of the house. The main purpose of external weeping tile is preventing water from getting into a basement. However, these pipes can become clogged or damaged, which causes excess water to put pressure on internal walls and basement floors.
In construction, a building or structure is waterproofed with the use of membranes and coatings to protect contents and structural integrity. The waterproofing of the building envelope in construction specifications is listed under 07 - Thermal and Moisture Protection within MasterFormat 2004, by the Construction Specifications Institute, and includes roofing and waterproofing materials.
Heavier material is typically used for underlayment of longer-lived roof materials in order to match their longer life span, and on less sloped roofs, which are more susceptible to leaking. For example, two layers of No. 30 felt might be used under a slate or tile roof, whereas a single layer of No. 15 might be adequate for a steeply raked roof ...
During active carbonatogenesis, the carbonate particles are produced by ionic exchanges through the cell membrane [32] by activation of calcium and/or magnesium ionic pumps or channels, probably coupled with carbonate ion production. [31] During passive carbonatogenesis, two metabolic cycles can be involved, the nitrogen cycle and the sulfur cycle.
Delamination is a mode of failure where a material fractures into layers. A variety of materials, including laminate composites [ 1 ] and concrete , can fail by delamination. Processing can create layers in materials, such as steel formed by rolling [ 2 ] [ 3 ] and plastics and metals from 3D printing [ 4 ] [ 5 ] which can fail from layer ...
With continued deformation, the material undergoes hardening due to molecular orientation, resulting in the multiplication and propagation of shear bands. [45] Shear bands may form in a material that exhibits strain softening, hence when the conditions which favour crazing are suppressed, polymers will tend to form shear bands. [6] [46] [47]
Crazing is a spider web pattern of cracks penetrating the glaze. It is caused by tensile stresses greater than the glaze is able to withstand. [1] [2] Common reasons for such stresses are: a mismatch between the thermal expansions of glaze and body; from moisture expansion of the body; and in the case of glazed tiles fixed to a wall, movement of the wall or of the bonding material used to fix ...
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