High Range Water-Reducing Admixture

UNF-5

Description

UNF-5 is a high range water reducer, commonly referred to as a superplasticizer. It is an aqueous solution of a modified naphthalene sulfonate and organic compounds.UNF-5 is made of naphthalene, sulfonic acid, HCHO and Alkali through sulphuration,hydrolyzation, condensation and neutralization reaction. UNF-5 contains no added chloride. UNF-5 meets the requirements of chemical admixture specifications for concrete: GB8076-1997, GB50119-2003.

Uses

1. UNF-5 produces concrete with extremely workable characteristics referred to as high slump. UNF-5 also allows concrete to be produced with very low water/cement ratios at low or normal slumps.
2. UNF-5 is ideal for use in prestress, precast, bridge deck or any concrete where it is desired to keep the water/cement ratio to a minimum and still achieve the degree of workability necessary to provide easy placement and consolidation. UNF-5 will also fluidize concrete, making it ideal for tremie concreting or other applications where high slumps are desired.
3. Compatible with Portland cement, normal Portland cement, Portland slag cement, fly-ash cement and Portland pozzolanic cement etc.

Advantages

1. Produce high performance concrete of C80 with slump of 50mm-70mm or C60 with slump of 180mm-200mm.
2. Slump control at the job site without adding water.
3. Higher early and ultimate strengths. Given the same amount of cement and slump requirement, this product can increase the concrete stress by 40-110%, 40-90%, 30-80% and 30-50% on day 1, 3, 7, and 28 respectively.
4. Improves concrete placebility with no loss in strength.
5. At addition rate of 0.5% -1.0%, UNF-5 can save cement 12%-20% in comparison to the concrete at the same slump and strength.
6. Higher strengths may be achieved more economically.
7. Improves cohesiveness and reduces concrete segregation.
8. Concrete achieves higher durability.
9. UNF-5 has wide application. It does not retard and introduce air. It will reduce the chemical heat in the cement and produces concrete with lower permeability.

Properties, Features & Characteristics

1. Appearance: Light brown powder. Non-poisonous, odorless, non-flammable and non-corrosive to steel bars.
2. Remarkable Plasticity: As a condition of blending where amount of cement and collapsibility are fixed aforehand, mixing water can be decreased by 10-30% when it is admixed with reinforced concrete at 0.3-1.5%.
3. Improve miscibility of concrete amalgamator with water and collapsibility as well. As a condition of equivalent blending, collapsibility can be increased by 12cm when it is added at standard blend dosage.

Parameters & Acceptance Criteria(Sodium salt of polynaphthalene sulfonic acid) Addition Rates

UNF-5 can be added directly or added in after melt. It can be added during mixing and after-mixing. The afterward approach can achieve better result. The suggested addition rate is 0.75%.

Direction

1. Prepare solutions as required.
2. Direct use of powdery agent is allowed. Alternatively the addition of the agent is followed by water moisturization (water-cement ratio:60%).
3. The agent can be combined with other externally applied agents if pilot development or laboratory experiment succeeds.

Package, Storage & Handling

1. For powder: Woven fabric bag with plastic liner. Net weight: 25kg +/- 0.13 kg.
2. Cautions should be taken to prevent form being torn by sharp-ended objects while packages are being transferred or delivered. When being contaminated by high humidity or moisturein case of leakage, it can be prepared in prescribed ways for further use without surrendering any effect.
3. It should be stored in a dedicated warehouse that is well-ventilated and dry. It remains effective in one year. After the expiration, date, it can be used again if testing results fall within the established range.