Catalogs >
MAPEI >
MAPECURE SRA

MAPECURE SRA
1 / 4Pages

Catalog excerpts

A R S re cu pe a M Curing admixture with the ability to reduce hydraulic shrinkage and the formation of micro-cracks WHERE TO USE The product is added during mixing to repair mortars from the Mapegrout range (Mapegrout T40, Mapegrout T60, Mapegrout Thixotropic, Mapegrout Hi-Flow, Mapegrout BM, Mapegrout FMR and Mapegrout Easy Flow), to binders, such as Stabilcem and Stabilcem SCC, and to all types of concrete, to allow them to expand during the first few days of curing, including during air curing. This property helps reduce the formation of micro-cracks and also guarantees that the final level of hydraulic shrinkage is extremely low. Some typical application examples Construction and repair of: • floor joists and motorway viaduct piers; • industrial floors; • ulti-storey car parks; m • ydraulic works, such as canals, overflow channels, h tanks, etc.; • refabricated concrete elements such as cupolas, p beams, pillars, buffer panels, etc.; • ining road and railway tunnels. l TECHNICAL CHARACTERISTICS Mapecure SRA is a special, chloride-free liquid admixture specially developed in MAPEI’s own Research & Development laboratories, to reduce final hygrometric shrinkage of mortar, ordinary and self-compacting concrete, to make them less prone to cracking problems. Mapecure SRA works by reducing the surface stresses of the water present in the capillary pores and as a result, the forces which act upon the walls of the pores is greatly reduced. Thanks to this phenomenon, the reduction in shrinkage is clearly visible (Fig. 1). The best results are obtained when Mapecure SRA is mixed with controlled-shrinkage repair mortars or in combination with concrete which contains Expancrete, in that it allows these systems to expand even further during the first few days of hardening, whether they are damp-cured or air-cured. When Mapecure SRA and Expancrete (Mapecrete System) are used together, the advantages of each single product combine and are greatly enhanced, to guarantee that the properties of mortar and concrete reach levels which would normally be impossible with traditional cementitious systems. As a result of this technology and according to the composition of the concrete, the final expansion and shrinkage levels may be programmed to guarantee that the structure acquires higher durability (Fig. 2). According to the doses used, Mapecure SRA reduces the final mechanical strength by 5-6% (Figs. 3 and 4). Mapecure SRA is compatible with all traditional, naphthalene sulphonate-based super-plasticising admixtures from the Mapefluid range, the new acrylic admixtures from the Dynamon range and with all types of cement according to UNI EN 197/1 Standards.

Open the catalog to page 1

TECHNICAL DATA (typical values) PRODUCT IDENTITY Density (g/cm³): Hygrometric shrinkage according to UNI 6678 700 650 Without SRA SRA = 0.1% SRA = 0.3% SRA = 0.5% Curing times (days) FIG. 1 - Values obtained with mortar containing CEM I 52.5 R cement, normalised sand and water, according to the composition indicated in the EN 196-1 Standards Contrasted-expansion air curing (+20°C and 50% R.H.) according to UNI 8147 450 Without SRA SRA = 0.1% SRA = 0.3% SRA = 0.5% Curing time (days) FIG. 2 - Values obtained with mortar containing CEM I 52.5 R cement, normalised sand and water, according to...

Open the catalog to page 2

Compressive strength (N/mm²) Without SRA SRA = 0.1% SRA = 0.3% SRA = 0.5% Curing time (days) FIG. 3 - Values obtained with mortar containing CEM I 52.5 R cement, normalised sand and water, according to the composition indicated in the EN 196-1 Standards Compressive strength (N/mm²) Curing time (days) FIG. 4 - Values obtained with mortar containing CEM I 52.5 R cement, normalised sand and water, according to the composition indicated in the EN 196-1 Standards, and 7% of Expancrete admixture Mapecure SRA complies with italian standard UNI 11641:2016 concerning the shrinkage reducing agent....

Open the catalog to page 3

PACKAGING Mapecure SRA is supplied in: – 900 kg tanks; – 20 kg drums; – 0.25 kg cans. STORAGE Mapecure SRA may be stored for up to 12 months in its original packaging in a dry place. SAFETY INSTRUCTIONS FOR PREPARATION AND APPLICATION Mapecure SRA is not considered dangerous according to current norms and regulations regarding the classification of mixtures. However, the use of protective gloves and goggles and the application of the usual precautions taken when handling chemical products are recommended. For further and complete information about the safe use of our product please refer to...

Open the catalog to page 4