Lightweight Aggregate Concrete

Concrete, Lightweight Aggregate

 

the most common type of concrete, in which lightweight aggregate is used as the coarse filler, cement (more rarely, gypsum, lime, synthetic resins) is used as the binder, and open sand or compact sand (for example, quartz sand) is used as the fine aggregate. In terms of the degree of porosity of the concrete, lightweight aggregate concrete is classified as compact, large-pore (sand-free), or aerated. In terms of purpose, it is classified as thermally insulating, structurally insulating, or structural.

Thermally insulating lightweight aggregate concrete of varying structure is used in buildings basically as a warmth-retaining material in sandwich enclosures. Its density (dry) is between 350 kg per cu m (for example, in large-pore lightweight aggregate concrete with synthetic resins) and 600 kg per cu m. Its compressive strength is 0.5–2.5 meganewtons (MN) per sq m (l MN per sq m = 10 kg-force per sq cm). Its coefficient of thermal conductivity is 0.11–0.17 watts per (m.°K), or 0.10–0.15 kilocalories per (m · hr · °C).

Structurally insulating lightweight aggregate concrete is used chiefly for single-ply wall paneling and large units. Its density is 700–1,200 kg per cu m. Its compressive strength is 3.5–10 MN per sq m. Its coefficient of thermal conductivity is 0.21–0.46 W per (m · °K), or 0.18–0.40 kcal per (m · hr · °C). Its cold resistance is 15–100 Mrz (from 15 to 100 alternating freezing-thawing cycles).

Structural lightweight aggregate concrete is designed for the various supporting structures of buildings and engineering installations (for example, bridges). It has a density of 1,400–1,800 kg per cu m. Its compressive strength is 10–50 MN per sq m. Its cold resistance is up to 500 Mrz. The use of structural light-weight aggregate concrete (instead of ordinary heavy concrete) in large-scale reinforced-concrete structures makes it possible to reduce the weight and cost of the structures substantially. High-grade structural concrete is also used in shipbuilding (for example, for the hulls of riverboats and seagoing vessels).

REFERENCES

Stroitel’nye materialy. Edited by M. I. Khigerovich. Moscow, 1970.
Buzhevich, G. A. Legkie betony na poristykh zapolniteliakh. Moscow, 1970.

G. A. BUZHEVICH

References in periodicals archive ?
Eight full scale rectangular cross-section columns filled with lightweight aggregate concrete and normal weight aggregate concrete, four specimens each, were tested under axial loads for comparison purposes.
The work includes: -A sewerage system of wastewater -a line supply of drinking water to homes and fire hydrants -a sewerage system stormwater -the general earthworks -the structure of pedestrian traffic, cyclists and automobiles -the temporary surface coatings -the civil NICT networks, irrigation and street lighting -a public lighting network -the development of street furniture the main Quantities are: 5 500 m3 earthworks mass 2 300 m3 excavation trench Implementation: 3700 m3 GNT 0 / 20 -700 m3 GNT 0/60 -300 m3 of sand -500 m3 of rice grain -200 m3 GNT 0/80 -700 m3 of lightweight aggregate concrete embankment 2000 T Gb 1300 T BBME - 400 MB of T on sidewalk spaces Mixed supply and installation of: 1100 ml sheath diam.
Lee, "Workability, and mechanical, acoustic and thermal properties of lightweight aggregate concrete with a high volume of entrained air," Construction and Building Materials, vol.
The 75 papers include discussions of such topics as welding properties and fatigue resistance of S690QL high-strength steels, hardening the surface of austenitic stainless steel by explosive treatment, surface properties of lightweight aggregate concrete and its correlation with durability, electrochemical impedance spectroscopy as a prospective tool for characterizing the intermetallic microstructure of lead-free solder, and estimating thermal boundary conditions by using a hybrid inverse approach.
The tab owns the intellectual property associated with the concrete mixes and the concept of B C and lightweight aggregate concrete wall layers, coupled with lead and resin-bound, boron carbide composite layers, as a radiation shielding technology.
Lightweight aggregates are materials having densities less than the usual aggregates and used worldwide to reduce the dead load in bridges, dams and high raise buildings; moreover lightweight aggregate concrete have many comparative advantages in comparison to normal concrete, like fire resistance, thermal insulation, moisture resistance and sound proof structures.
The topics include coating postponed-set mortar with a single-screw extruder, the induced synthesis of hydroxyapatite by chitosan for enamel remineralization, an experimental study of the mechanical performance of shale lightweight aggregate concrete, friction and wear mechanism between rubber and nickel for water lubricated bearings, and the numerical simulation of the failure process in a girder bridge under seismic influence.
Mechanical properties of expanded polystyrene lightweight aggregate concrete and brick, Construction and Building Materials 27(1): 32-38.
Once the wooden deck was removed, which will be replaced by a lightweight aggregate concrete deck weighing the same as the timber deck, the steel structure was covered with a large industrial shrink wrap enclosure, under which all of the thermal spraying took place.

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