Alumina Cement

alumina cement

[ə′lüm·ə·nə si′ment]
(materials)
A cement made with bauxite and containing a high percentage of aluminate, having the property of setting to high strength in 24 hours.

Alumina Cement

 

a rapid-hardening hydraulic binding material; a product of the fine grinding of clinker produced by roasting (prior to smelting or calcining) of the raw mix, which consists of bauxites and limestone material. The raw mix is roasted and smelted in blast furnaces, electric furnaces, rotary kilns, or cupola furnaces. According to the content of A1203 in the finished product, a distinction is made between ordinary alumina cement (up to 55 percent) and high-alumina cement (up to 70 percent). The smelting temperature of a raw furnace charge of ordinary alumina cement is 1450°-1480° C, whereas for high-alumina cement it is 1700°-1750° C.

Alumina cement is characterized by a rapid increase in strength, a high degree of exothermy during hardening, increased resistance to corrosion in sulfate environments, and high fire resistance. In comparison with portland cement, alumina cement makes possible the production of concretes and mortars with higher density and water resistance.

I. V. KRAVCHENKO

References in periodicals archive ?
This report analyzes the global cement market by type (rapid hardening cement, low heat cement, high alumina cement, white cement, colored cement, hydrographic cement and other), by application (construction, infrastructure); it also studies the top manufacturers in the market.
Based on the product, slag cement market is categorized by Low Heat Cement, Sulphates resisting cement, blast furnace slag cement, high alumina cement, while cement, coloured cement, and pozzolanic cement.
In fact, concrete produced from Alumina Cement (HAC) was never recorded in any investigations to my knowledge at HRI when I was at the authority's central headquarters then based at St Luke's Hospital, Crosland Moor.
Midgley, "The conversion of high alumina cement," Magazine of Concrete Research, vol.
High alumina cement (HAC), mainly consisting of aluminum oxide ([Al.sub.2][O.sub.3]) from about 50 to 85% in cement clinker, could be often used for a special application, due to both high resistance to aggressive chemical ions (i.e., sewer concrete) and rapid development of strength within 24 hours [1-4].
Two tenders requesting international offers to supply (a) 1,000 Kg cyanide salts, also (b) 180 tons calcium alumina cement (hydraulic refractory cement).
By mixing complex or multicomponent binder (constituents are high alumina cement, metallurgical slag and liquid glass solution) with firestone (fine size up to 1 mm) aggregate refractory concrete was produced.
High alumina cement had been found to have been used there.
The binder component (normally high alumina cement) of the concretes imparts the strength required during transportation and erection; this strength is attained after setting and drying.
It was said that these structures were mistakenly constructed from high alumina cement which has resulted in them crumbling over the years to expose rusting internal reinforcement bars.
My statues of humans and animals are made from metal and mesh armature then a high alumina cement and coated with fibreglass resin.