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Aggregate passing the G.4.75 sieve (screen No. 4)and retained on F 0.075 (screen No. 200)
Capacity of the mixture to keep its original volume while going from the freshly placed to hardened state, without being contracted or expanded.
Temporary platform, made of wood or iron where planks are placed to ease construction when performing tasks at height above the ground.
Instrument similar to a strainer, used to separate thick from fine particles forming a mixture.
Chemical product, which is applied before coating walls with painting.
Tendency for natural separation of mixture constituents, for example: the most heavy elements are deposited at the bottom and the most light ones on the surface.
Piece of rod or wood that avoids two elements of the arch centering to be joint.
Change from fluid-like consistency to stiffen mass of a cement paste, mortar or concrete. It implies loss of plasticity.
Concrete tube installed to take away waste water (sewage) from constructions.
Reinforced concrete foundation, used in soft ground to sustain buildings.
Lesser length of a concrete slab.
Mortar or concrete projected pneumatically at high velocity onto a surface; usually surfaces with difficult access or when arch centering is not required to avoid failures.
It is also known as ‘microsilica‘. It is an artificial pozzolana presented as a light-to-dark-gray-ultrafine powder, manufactured as a subproduct from the production of silicon and ferrosilicon metal. Its volumetric weight without being compacted goes from 250 to 300 kg/m3.
Laboratory test that indicates concrete consistently level or flow capacity. At lower slump (the minimum slump is zero), lower flow capaciyy. Slumps nearby the maximum value of 30 indicate watery or flowing concrete.
Rectangular box of iron that is embedded to the wall to receive the installation of a contact or light switch.
Device where the light bulb is placed, which receives electric current cables
Wooden piece used as arch centering by the side of some concrete elements, such as load bearing units, shoes, slabs.
Part of the tread to step on.
Tool for bending rods, usually made with a 1-" rod or bar.
Maximum loading capacity that a material is capable of supporting before it reaches its rupture limit, it is expressed in terms of kg/cm"
Magnitude of internal forces by area unit, produced by external charges. When the forces are parallel to the plane, the stress is called shear stress; when the forces are normal to the plane, the stress is called normal stress; when the normal stress is d
Action to remove the mold or arch centering from concrete or mortar.
Wooden arch centering element that is usually going in a horizontal and in one way of the slab and it is used to support drawers or timbers of the arch centering going the opposite way.
Concrete similar to normal concrete but manufactured with more light aggregates. Its density varies between 1360 to 1840 kg/cm3 and contrasts with that from normal concrete, whose interval varies from 2080 to 2480 kg/cm3. This type of concrete us used to lighten dead load in concrete elements.
Capacity of materials to absorb humidity.
Sulphur salts, abundant in soil and natural water, and in industrial, domestic or municipal waste. Theses chemical compounds can considerably damage concrete durability.
Free water in excess on the surface of the particles of the aggregate; humidity not absorbed by the aggregate and considered as part of water of concrete mixture.
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