Product Data Sheet Show all documents

SikaCem® FLC 100

A powdered admixture for the production of non-shrink, high strength grouts for posttensioned cables and fixing anchors or bolts in concrete or rock

SikaCem® FLC 100 is a chloride free admixture in powder form. It is added at the rate of 6% by weight of cement to produce a flowable, pumpable, non-shrink, non-segregating, impermeable grout, providing high strength and high bond to steel. The most important property SikaCem® FLC 100 imparts to grout is the ability to protect cables against corrosion from aggressive agents and stress.
Inadequate protection against corrosion offered by normal grouts is due to:
a) Excessive capillary microporosity due to high water/cement ratio. Using SikaCem® FLC 100 the water/cement ratio is reduced to 0.3
b) High macroporosity caused by bleed water collecting under strands and in the upper part of the sheath. When bleed water evaporates and is reabsorbed by the cement paste, voids form thus providing easy access for corrosive substances. European recommendations on prestressed concrete (FIP) prescribe that the volume of bleed water must not exceed 0.5%. With the use of SikaCem® FLC 100, the volume of bleed water is considerably lower: it ranges from 0 to a maximum of 2% depending upon the type of cement used.           c) Shrinkage of cement paste and consequent cracking. With normal cement grouts final shrinkage varies from 2 to 3mm. SikaCem® FLC 100 allows not only shrinkage to be eliminated completely, but also slight expansion to occur during setting and hardening.  

  • Absence of shrinkage, and expansion ranging from 200 to 800 μm/m depending upon the type of cement used.
  • Initial setting time in excess of 3 hours at +30°C.
  • High early and ultimate strengths: depending on the type of Portland cement used, Compressive strength - (EN 196 PT 1) can range from:
        15 to 26 N/mm² at 1 day 50 to 70 N/mm² at 28 days         Slightly lower values are obtained if pozzolanic or slag cements are used.      
  • High bond to steel: after 7 days the value is in excess of 15 N/mm².
             Owing to its high flowability, a cement grout made with 6% by weight of SikaCem® FLC 100 assures the complete filling of sheaths, especially among the strands of cables. This ensures maximum protection of steel against corrosion caused by aggressive agents. As this high flowability is obtained with a low water / cement ratio, the hardened cement paste is dense, compact, impermeable and, therefore, highly durable. On the other hand, the high cohesion and fluidity of the fresh mix, together with freedom from shrinkage, prevents the formation of voids which are often responsible for the penetration of aggressive agents.
Product Data Sheet Show all documents

Usage

The production of non-shrink, high strength grouts for posttensioned cables and fixing anchors or bolts in concrete or rock.            The main properties of grouts containing 6% of SikaCem® FLC 100, can be summed up as follows:        
  • Very high flowability (as measured by the Flow Cone Test) without bleed water or with a very low amount of it. The pumpability of the grout is assured for at least two hours at + 20°C.
  • High mix water retention. This very important property imparts high cohesion to the very flowable mix. Under vacuum, of 600 mm Hg, over 90% of the water is retained by the SikaCem® FLC 100. Inadequate water retention would allow water to separate from solid components when the grout is forced through strands of tendons.
 

Advantages

  • Absence of shrinkage, and expansion ranging from 200 to 800 μm/m depending upon the type of cement used.
  • Initial setting time in excess of 3 hours at +30°C.
  • High early and ultimate strengths: depending on the type of Portland cement used, Compressive strength - (EN 196 PT 1) can range from:
        15 to 26 N/mm² at 1 day 50 to 70 N/mm² at 28 days         Slightly lower values are obtained if pozzolanic or slag cements are used.      
  • High bond to steel: after 7 days the value is in excess of 15 N/mm².
             Owing to its high flowability, a cement grout made with 6% by weight of SikaCem® FLC 100 assures the complete filling of sheaths, especially among the strands of cables. This ensures maximum protection of steel against corrosion caused by aggressive agents. As this high flowability is obtained with a low water / cement ratio, the hardened cement paste is dense, compact, impermeable and, therefore, highly durable. On the other hand, the high cohesion and fluidity of the fresh mix, together with freedom from shrinkage, prevents the formation of voids which are often responsible for the penetration of aggressive agents.

Packaging

SikaCem® FLC 100 is supplied in 500kg bags.

Product Details

Product Information

Shelf life

12 months from date of manufacture. Failure to comply with the recommended storage conditions may result in premature deterioration of the product or packaging. For specific storage advice consult the Sika Technical Services Department.

Storage conditions

Store out of direct sunlight, clear of the ground on pallets protected from rainfall. Avoid excessive compaction.

Do not use if the bag is damaged or has been opened for more than 1 month.
Technical Information

Specific advice

MIXING INSTRUCTIONS:

Introduce approximately 25 litres of water per 100kg of cement into the mixer.

       

Start the mixer and add SikaCem® FLC 100 (6% by the weight of cement) followed by the cement.

           

Mix for 3 minutes until a plastic and homogeneous mixture is obtained. Add approximately 7 litres of water and mix for a further 2 minutes until the grout is flowable, without lumps and the flow cone empties in approximately 20 seconds. If a high-speed mixer is used (about 1500 r.p.m.) the total mixing time can be reduced from 5 to 3 minutes. The amount of mixing water necessary by weight of cement and SikaCem® FLC 100 is approximately 34% but can range from a minimum of 30% to a maximum of 38% depending upon the cement used. Finely ground cement usually requires a higher amount of water. The grout thus obtained can generally be pumped for at least 2 hours, unless the cement used shows a rapid or false set.

 

Application

Consumption

Yield

Approximately 68 litres of highly flowable grout are obtained by mixing:

100 kg of cement,

6 kg of SikaCem® FLC 100

and 34 litres of water.

         

TYPICAL EXAMPLES OF PROPERTIES OF CEMENT PASTES

CONTAINING 6 kg's OF SikaCem® FLC 100:

    

Type of cement  OPC ASTM C-150 Type 1

     

Water  (% by weight of cement)  34.5%

     

Flow-Cone test (EN 445)   Initial = 15 s  /  30min = 17 s

      
Bleed water (EN 445)   less than 2% (by volume)


Expansion (at 3 hours)   0 - 2%


Setting times   Initial > 3 hours  /  Final < 10 hours

 

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