Technical Bulletin

Recommended Procedures for Batching & Mixing Chryso®Force 10,000 D Concrete

14 June 17

Batching and Mixing Guidelines

Producing high-quality, high-performance concrete with Chryso®Force 10,000 D depends on thorough and uniform mixing. The densified silica fume must be fully dispersed throughout the mix to avoid agglomeration and ensure optimal performance. While standard batching procedures as outlined in ACI 304, Guide for Measuring, Mixing, Transporting, and Placing Concrete, should be followed, additional steps are required when using this product. For further guidance, refer to the Silica Fume User’s Manual by the Silica Fume Association (FHWA-IF-05-016).

Product Types

Chryso®Force 10,000 D is supplied as a dry-densified powder and is available in both bulk and bagged formats. Bulk material is typically stored in silos and batched similarly to cement. The bagged form is available in 11.3 kg (25 lb) repulpable bags, which can be added directly to the mixer, either unopened (if dry and intact) or opened manually when necessary.

Batching and Mixing

Bulk Material

When using bulk material, weigh it as you would cement, but ensure accuracy due to its lower volume in the mix. Add Chryso®Force 10,000 D with other cementitious materials and ingredients, but never add it first into an empty drum or into water-only mixes. Begin mixing at a slump of 50–100 mm (2–4 in.) for 100 revolutions at mixing speed to prevent the formation of cement or silica fume balls and to ensure proper distribution. Once this initial mixing is complete, introduce the superplasticizer and mix for an additional 70 revolutions to reach the desired slump.

Bagged Material

Before use, inspect the repulpable bags to ensure they are dry—do not use wet bags, as they will not disintegrate properly. Set aside the number of bags required per truck. For example, with a 5% replacement in a 385 kg/m³ (650 lbs/yd³) mix:

Inch/Pound Calculation

650 lbs/yd³ × 0.05 = 32.5 lbs/yd³
32.5 lbs/yd³ × 10 yd³ = 325 lbs total
325 lbs ÷ 25 lbs/bag = 13 bags

Metric calculation

385 kg/m³ × 0.05 = 19.3 kg/
19.3 kg/m³ × 8 m³ = 154 kg total
154 kg ÷ 11.3 kg/bag = 13.6 bagsuse 14 bags

Add cement, aggregates, and water to the mixer (excluding the superplasticizer). Then add the bagged product. As with bulk material, do not add the product first or into a water-only drum. Mix for 100 revolutions, add the superplasticizer, and continue mixing for 70 revolutions.

Special Considerations

In some conditions, such as low water/cementitious ratios, use of fine or rounded aggregates, or in pan mixers, the repulpable bags may not fully break down. If this is a concern, conduct a trial batch to confirm performance. If the bags do not disintegrate, open them manually and empty the contents into the mixer while the drum is stationary, then discard the bags.

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