Expansive Cement

expansive cement

[ek′span·siv si′ment]
(materials)
A type of hydraulic cement, usually of high sulfate and alumina content, that expands after hardening to compensate for drying shrinkage.

Expansive Cement

 

the generic name for a class of cements that increase in volume during hardening. In most such cements, the expansion is due to the formation of highly basic calcium sulfoaluminate hydrates in the hydrating binder. The volume of these calcium compounds is 1.5 to 2.5 times greater than the volume of the initial solid components as a result of a large quantity of chemically bonded water. The total expansion ranges between 0.2 and 2 percent; the strength ranges between 30 and 50 meganewtons/m2.

In the USSR, the most widely used types are waterproof expansive cement, expansive portland cement, gypsum-alumina expansive cement, and stressing cement. All expansive cements harden best and exhibit the greatest expansion in the presence of moisture. Since they are highly waterproof, expansive cements are used for sealing joints between prefabricated rein-forced-concrete structural members, for reliable waterproofing in certain hydraulic engineering structures, and for manufacturing of reinforced concrete pressure pipes.

expansive cement, sulfoaluminate cement

A cement which when mixed with water forms a paste that tends to increase in volume, after setting, to a significantly greater degree than portland cement paste does; used to compensate for volume decrease due to shrinkage or to induce tensile stress in reinforcement. Classified as Type K: Contains anhydrous aluminosulfate burned simultaneously with a portland cement composition, or burned separately when it is to be inter-ground with portland cement clinker or blended with portland cement, calcium sulfate, and free lime. Type M: A mixture of portland cement, calcium aluminate cement, and calcium sulfate. Type S: A portland cement containing a large computed tricalcium aluminate content, modified by an excess of calcium sulfate above usual optimum content.
References in periodicals archive ?
Built adjacent to the manufacturer's Lawrenceville, Ga., home office, the warehouse harbors one of the largest slabs on grade--free of saw-cut control joints and expansive cement specs--to date.
Al-Tabbaa, "MgO expansive cement and concrete in China: Past, present and future," Cement and Concrete Research, vol.
Deng, "Deformation and mechanical properties of the expansive cements produced by inter-grinding cement clinker and MgOs with various reactivities," Construction and Building Materials, vol.
Mitri, "Rock breakage using expansive cement," Engineering, vol.
Hanif, "Optimum use of Bristar-100 expansive cement in marble quarries of Saudi Arabia," Final Report, Research Project No.
Daemen, "Influence of elevated temperature on axially loaded expansive cement grout borehole plug sealing performance," Magazine of Concrete Research, vol.
Polivka, Factors Influencing Expansion of Expansive Cement Concrete, ACI, London, UK, 1972.
In 1963, he joined Chemically Prestressed Concrete Co., developing Type K expansive cement as its technical director.
[14] explored the microcharacteristics of borehole sealing composite material that is composed of polyurethane and expansive cement. Ge et al.
Due to the environmental and social impact related to blasting of rocks, new methods of fragmentation have been developed including the expansive cement fracturing.
The newly formed CTS Research Alliance will muster educational leaders to test and expand knowledge of calcium sulfoaluminate (CSA) rapid-hardening and expansive cements. Cypress, Calif.-based CTS Cement Mfg., proprietor of Rapid Set and other packaged or bulk powder formulations for performance concrete, notes that current university curriculum centers on traditional portland cement chemistry.
Cohen, "Theories of expansion in sulfoaluminate--type expansive cements: schools of thought," Cement and Concrete Research, vol.