Grade 72.5 Rapid-setting CSA Cement
(Calcium Sulfoaluminate Cement)
Summary
● Grade 72.5 High-strength Rapid-setting Calcium Sulfoaluminate Cement, is one of special rapid hydraulic binding materials, also named Rapid-setting Cement, High-strength Cement, GRC Cement, Fast-hardening Cement and CSA cement.
● Grade 72.5 CSA Cement has special physical performances for example early strength, high strength, rapid setting, fast hardening, low alkalinity, freeze resistance, sulfate corrosion resistance, etc.,
● Compressive Strength at 3d is not less than 72.5MPa.
● Grade: 72.5
Characteristics
● Appearance: light dusty grey powder
● High early strength
● High strength development rate
● Rapid setting: initial setting and final setting both are earlier than Portland cement.
● Micro expansion
● Low degree of shrinkage
● Low alkali: PH value is about 11 and lower than Portland cement.
● Feeble rust to steel
● Resistance to freezing and thawing
● Impermeability
● Resistance to sulfate attack
● Can get more fast hardening and demoulding if to use together with type SAC-1 Rapid-setting Accelerator.
Technical Data
As per China National Standard GB20472-2006
● Specific Surface Area: 400m2/kg Min
● Initial setting time: 10-40 minutes
● Final Setting Time: 20-60 minutes
● Compressive Strength Value: 45MPa Min(1d), 72.5MPa Min(3d)
● Flexture Strength Value: 7.0MPa Min(1d), 8.0MPa Min(3d)
Application
● To make C60 or more high strength concrete of impermeability, frost and sulfate corrosion resisting;
● To make large precast component, cast-in-place frame construction engineering, supporting by rock anchoring and shotcreting, segmental member, block, etc.;
● To make high-strength concrete;
● To make GRC (glassfibre reinforced cement) products, cement pipe, cement pole, cement brick, ostentatious board on outside wall and man-made marble products, etc.;
● To make artwares, cement members with European style, landscape, imitation mountains, sculpture, etc.;
● To be used in sea-water resistance project, for example sea wall, road and basic concrete near sea, aquarium of ocean park, sea-water management project, concrete pile in sea, etc;
● To make concrete construction of chemical resistance;
● To be used in the underground well of mineral for rapid repair the laneway, shoring etc
● To be used in low temperature condition, for example in winter, in several kinds of mineral well.
● To be used in special concrete constructions such as high-speed way, airport runway, bridge, culvert, underground mineral well, dam of reservoir, banks of river, municipal works, subway, etc.;
● To make Sea water attack resistance projects for example sea wall, dam, mariculture project, sea water desalination project, oceanarium, etc.
Usage
● Ratio of concrete mixers must be determined by trial method. The recommended lowest used quantity of R-SAC is not less than 300kg every M3 concrete. Recommended W/C ratio should be 0.30-0.50.
● Don’t add water stir or vibrate by second times after R-SAC mortar or concrete does not has mobility.
● Don’t mix other kinds of cements or high alkali goods such as lime.
● It is necessary to cure R-SAC concrete on moisture condition after final setting of R-SAC concrete in Summer. Curing term is more than 3 days.
Weather-proof and insulation is necessary when using R-SAC in winter. And must add 0.5%-4% frost preventing agent into R-SAC concrete.
● Be unfit for the engineering projects and position resistance to heat .
● The cement product steam-cured temperature value is not less than 80ºC. The best steam-cured temperature is 60-70ºC. The steam-cured term is more than 2 hours.
● Must avoid to that the admixtures cause strength of concrete or cement products fall due to using admixtures.
● If for getting rapid setting and fast hardening or demoulding of cement or concrete products, to recommend using type SAC-1 Rapid-setting Accelerator for SAC and HAC.
Storage, Transportation and Packing
● To be stored in dry cool storage and not mix foreign body
● Transportation: as per the common goods; classification for conveyance - not to be required; not to allow the packages to be fallen down or damaged
● Packing: 1MT jumbo bag