Search results
Results from the WOW.Com Content Network
The excavation of the underground aqueduct of Megara revealed that a reservoir was coated with a pozzolanic mortar 12 mm thick. This aqueduct dates back to c. 500 BCE. [9] Pozzolanic mortar is a lime based mortar, but is made with an additive of volcanic ash that allows it to be hardened underwater; thus it is known as hydraulic cement.
An FRCM system can be constituted by a single textile or by several textiles embedded in a single thickness of mortar. [5] The matrix (or mortar), cementitious, airborne, hydraulic, bastard or based on natural lime, is reinforced with fibers made by: [11] [12] [13] high tensile steel (UHTSS – Ultra High Tensile Strength Steel); basalt;
Ferrocement or ferro-cement [1] is a system of construction using reinforced mortar [2] or plaster (lime or cement, sand, and water) applied over an "armature" of metal mesh, woven, expanded metal, or metal-fibers, and closely spaced thin steel rods such as rebar. The metal commonly used is iron or some type of steel, and the mesh is made with ...
Therefore, thick covers defeat the very purpose for which it is provided. There is a need for judicious balance of cover depth and crack width requirements. A possible economical solution for this paradox is the placing of a second layer of corrosion-resistant reinforcement like stainless steel rebars or meshes or FRP rebars in the concrete ...
It is possible that galleting is used when the local stone is not an easily worked freestone, which means that the stone is more irregular and therefore requires thick mortar joints. [1] In this case, gallets would serve as wedges to provide structural support to the stone and would shield the mortar from weather.
Fibers with a non-circular cross section use an equivalent diameter for the calculation of aspect ratio. If the fiber's modulus of elasticity is higher than the matrix (concrete or mortar binder), they help to carry the load by increasing the tensile strength of the material. Increasing the aspect ratio of the fiber usually segments the ...
Shotcrete, gunite (/ ˈ ɡ ʌ n aɪ t /), or sprayed concrete is concrete or mortar conveyed through a hose and pneumatically projected at high velocity onto a surface. This construction technique was invented by Carl Akeley and first used in 1907.
Cement-mortar lined ductile iron pipe is a ductile iron pipe with cement lining on the inside surface, and is commonly used for water distribution. Cement-mortar lined ductile iron pipe is governed by standards set forth by DIPRA ( Ductile Iron Pipe Research Association ), and was first used in 1922 in Charleston, South Carolina .