Expansive Agent(EA) for shrinking compensation in concrete

Description

EA is a Calcium-Sulfo-Aluminate (CSA) cement produced from a special

clinker and milled to the particle size of cement. It was developed to reduce and compensate

the hydraulic shrinkage of cement based construction products.

Chemical composition (M.-%)

SiO2 1-2 %

CaO 50-54 %

SO3 27-31 %

Al2O3 12-15 %

MgO 0.4-2.3 %

Cl < 0.05 %

Fe2O3 0.3-0.8 %

Na2O-equi. < 0.75 %

LOI < 3 %

Physical properties

Appearance off-white, easy handling and flowing powder

Specific density ca. 2.86 g/cm3

Specific surface (Blaine) ca. 3700 cm2/g

Apparent density loose 0.8 0.9 g/cm3

tapped ca. 1.5 g/cm3

Function

The mineral parts of EA react with water producing fine needles of ettringite.

Together with the hardening phase of the cement these will grow together to larger crystals,

giving a volume increase (expansion). This structure contains a pre-stress that will

counteract the shrinkage by chemical hydration and the shrinkage due to the drying of the

mortar, resulting in a reduced shrinkage.

Advantages

Depending on the addition level:

- reduced shrinkage

- increased impermeability to water

- increased mechanical strength

- chemical pre-stressing

- good adhesion to substrates and reinforcement

and ease of handling.

Applications

EA can be used in a variety of applications, such as:

- repair mortars

- bedding mortars and self levelling compounds

- surface coating mortars for concrete

- flooring

- high density mortars and concrete

Addition level/dosage

Typical addition/dosage levels are 4 6 % on the cement weight. Expansion and reduced shrinkage are proportional to the addition level. It is highly recommended that laboratory trials

should first be carried out to determine the correct addition level of EA.Too high an addition level of EA will result in extremel with reduced strength, high porosity and reduced frost resistance

Compatibility

EA is compatible with Portland cement and hydraulic binders, including ground blast furnace slag, fly ash and hydrated lime.

Health & Safety

EA is alkaline and should be handled like other cements. Avoid contact with skin or eyes and wear protective gloves and goggles. In case of contact with eye flush immediately with plenty of water. Refer to Material Safety Data Sheet for full details.

Storage

EA is very sensitive to moisture and should be stored in cool, dry conditions

Packaging

Packed in 50 kg bags

We are a chemicals and chemical related products manufacturer and exporter in China. Located in xiamen, Fujian, China. We mainly Manufacture construction chemicals, concrete admixtures, buiding materials, and other fine chemicals, like cosmetics raw materials, etc.