MasterLife SRA 900

Shrinkage Reducing Admixture for Concrete

Yazı

Material Description

Shrinkage describes the external changes in the volume of concrete (contraction) which are independent of the loading and caused by changes in the water regime and the chemical reaction (hydration) of the concrete. Due to shrinkage, concrete may exhibit a severe crack development which allows the ingress of harmful substances potentially leading to decreased durability.

MasterLife SRA 900 is a liquid shrinkage reducing admixture which reduces both the autogenous and drying shrinkage of concrete, while maintaining its mechanical properties. The admixture is composed of carefully selected organic compounds which chemically reduce the capillary forces within concrete. MasterLife SRA 900 does not contain any expansive material.

Areas of Application

• Concrete with a specified or reduced shrinkage level.

• Concrete with crack width limitation requirements.

• Concreting in adverse weather conditions (wind, sun).

• Concreting with high quality and/or in large volumes.

• Industrial floors or pavements.

• Floors for sports centres (skating rinks, tennis courts, running tracks, etc.).

• Prestressed elements (e. g. concrete beams, hollow core slabs).

• Fixed elements (e. g. containments, sedimentation tanks, fixed walls).

• Façade panels (especially when it is made out of HPC, VHPC or UHPC).

• Hydraulic structures (e. g. tanks, reservoirs, swimming pools, concrete in marine environments).

• Foundations and underpinnings.

• Road and railway tunnel vaults.

Consult our Technical Services Department for any application not covered above.

Characteristics and Benefits

MasterLife SRA 900 offers the following economic and technical benefits to the Ready-Mix and Precast industries:

• Highly efficient shrinkage reducing admixtures.

• Reduced autogenous and drying shrinkage at dosages of 1% by weight of cement.

• High cement compatibility and excellent strength retention properties.

• Reduced crack widths for an increased durability.

• Increased joint spacing in slabs are possible.

• Almost no emission of volatile organic compounds (VOC) (Class A+ for all samples).

• No impact on superplasticizer dosage for many subsequent surface finishes.

• Aqueous product for indoor application.

• Imparts a harder dust free surface.

• Easy and economical application.

• Reduces labour costs.