Perlite Concrete

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Perlite Concrete

 

a variety of lightweight concrete in which the aggregate is made from expanded perlite or a similar volcanic rock, for example, obsidian or vitrophyre. The main binder for perlite concrete is cement, although such materials as lime, plaster, and synthetic resins are also used.

Perlite concrete that is used for thermal insulation has a density of 500 kg/m3 and a coefficient of thermal conductivity that ranges from 0.07 to 0.13 watts per meter-degree K (W/m•°K). Structural perlite concrete, which also has thermal-insulating properties, has a density that ranges from 600 to 1,000 kg/ m3, a strength that ranges from 3.5 to 10 meganewtons per square meter, and a coefficient of thermal conductivity that ranges from 0.15 to 0.33 W/m•°K; the structural variety of perlite concrete is used mainly for producing prefabricated enclosing members in buildings. Combined aggregates, for example, perlite with keramzit (seeKERAMZIT), are efficiently used in structural perlite concrete. The lightest perlite concretes, for example, the Soviet-made perlitoplastbeton, contain synthetic resins.

REFERENCE

Strizhevskii, M. V., N. V. Morozov, and M. T. Sedakova. Perlity i perlitobetony v industrial’nom stroitel’stve. Irkutsk, 1963.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
The addition of nanosilica affects the water absorption of light concrete; although the concrete has a considerable volume of pores mainly attributed to the aggregates, the cementitious matrix is densified by the addition of NS, thus inhibiting the interconnection of pores that allow the migration of water from the matrix to the aggregate and consequently decreasing the water absorption in a low proportion of the order of 4.3% for the concrete of added aliven and 5.2% in the perlite concrete added with NS.
Inside the aggregates of the perlite concrete can be noticed the presence of gypsum crystals (CS) (Figure 14).
While for perlite concretes, only 10.4 MPa without addition and 9.9 MPa with NS were achieved, and these values when taking into account the standard deviation were statistically equal.
For the perlite concretes, it is of the order of 32.4% for PEC5-0 and 31.3% for PEC5-10.
After the 15 weeks of exposure to magnesium sulfate, it can be seen that the perlite concretes are affected to a greater extent by magnesium sulfate, causing a warpage of 3.25 mm in the exposed joints of nonadded concrete (Figure 6(a)) and 2.75 mm for joints of added concrete (Figure 6(b)).
For the perlite concretes (Figure 12), the same behavior is observed at the edge as for the aliven concretes.
Caption: (3) The wood base, perlite concrete, sand, and brick layers make the oven's foundation (left).
In this investigation, all the specimens were constructed of lightweight perlite concrete. Lightweight concrete was prepared from the volumetric mixture of cement and lightweight perlite aggregate.