Product Data Sheet Show all documents

Sika® ViscoCrete® ACE 8502

(former MasterGlenium® ACE 8502)

HIGH-RANGE SUPERPLASTICISER FOR PRECAST MANUFACTURING

Sika® ViscoCrete® ACE 8502 is an advanced polycarboxylic ether (PCE) based superplasticiser developed to achieve high early strength ideally suited for the precast industry where highest durability and performance are demanded. With specifically tailored constitution of the active material, Sika® ViscoCrete® ACE 8502 shows excellent dispersion of cement and still provides extended slump retention even at low water binder ratio.

The superior development of early strength with Sika® ViscoCrete® ACE 8502 allows for zero or minimum accelerated heat curing processes in precast manufacturing. Sika® ViscoCrete® ACE 8502 is compatible with all Portland cements meeting international standards and is formulated to comply with ASTM C494 for Type F admixtures. Sika® ViscoCrete® ACE 8502 is not to be used with sulphonated polymer-based admixtures.

Sika® ViscoCrete® ACE 8502 is differentiated from conventional superplasticisers in that it is based on a unique polycarboxylate ether polymer with long lateral chains. This greatly improves cement dispersion. Conventional superplasticisers, such as those based on sulphonated melamine and naphthalene formaldehyde condensates, at the time of mixing, become absorbed onto the surface of the cement particles. This absorption takes place at a very early stage in the hydration process. The sulphonic groups of the polymer chains increase the negative charge on the surface of the cement particle and dispersion of the cement occurs by electrostatic repulsion.

At the start of the mixing process the same electrostatic dispersion occurs as described previously, but the presence of the lateral chains, linked to the polymer backbone, generate a steric hindrance, which stabilises the cement particles capacity to separate and disperse. This mechanism provides flowable concrete with greatly reduced water demand.  
Product Data Sheet Show all documents

Usage

Sika® ViscoCrete® ACE 8502 offers the following benefits for the precast concrete industry:
  • Produce rheoplastic and self-consolidating concrete using low w/c ratio
  • Optimize curing cycle by shortening curing time or decreasing curing temperature
  • Eliminate heat curing processes
  • Eliminate energy required for placing, consolidation and curing
  • Improve surface appearance and concrete quality
  • Produce durable precast concrete elements
  • As compared to the traditional super- plasticisers, improve engineering properties such as early and ultimate compressive and flexural strengths
     
  Sika® ViscoCrete® ACE 8502 may also be used for certain ready-mix concrete application, typically in synergy with a retarder.

Advantages

Sika® ViscoCrete® ACE 8502 is differentiated from conventional superplasticisers in that it is based on a unique polycarboxylate ether polymer with long lateral chains. This greatly improves cement dispersion. Conventional superplasticisers, such as those based on sulphonated melamine and naphthalene formaldehyde condensates, at the time of mixing, become absorbed onto the surface of the cement particles. This absorption takes place at a very early stage in the hydration process. The sulphonic groups of the polymer chains increase the negative charge on the surface of the cement particle and dispersion of the cement occurs by electrostatic repulsion.

At the start of the mixing process the same electrostatic dispersion occurs as described previously, but the presence of the lateral chains, linked to the polymer backbone, generate a steric hindrance, which stabilises the cement particles capacity to separate and disperse. This mechanism provides flowable concrete with greatly reduced water demand.  

Packaging

▪ 205 L drum

▪ 1,000 L tank

Product Details

Product Information

Shelf Life

12 month shelf life from date of manufacture

Storage Conditions

Must be stored in a place where the temperature is not below 0°C.

In case the product freezes, increase the temperature of the product to 30°C and remix.

Application

Consumption

Recommended Dosage

0.8 to 1.5 Ltr /100 kg of binder

Other dosages may be used in special cases according to specific job site conditions. In this case please consult our representative.
Application steps

APPLICATION INSTRUCTIONS

Sika® ViscoCrete® ACE 8502 is a liquid admixture to be added to the concrete during the mixing process. The best results are obtained when the admixture is added after all the other components are already in the mixer and after the addition of at least 80% of the total water.

 

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