Concrete Retarder

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Concrete Retarder

Concrete Retarder, MNC-BSType

MNC-BS type concrete retarder is applied toconstruction at high temperature, long-distance transport and various types ofconcrete, such as ultra-high-range pumping type, in-situ type, mass type,self-leveling type, high strength type, high performance type, etc. Also, itcan be used for different types of Portland cement, including ordinary type,slag type, Pozzolana blendtype, fly ash type and compound type.

Our concrete retarderfeatures good workability, strong cohesiveness, no segregation and no bleedingwith water reducing rate ranging from 2.5 percent to 3.5 percent. If combinedwith superplasticizer, itcan efficiently reduce its dosage and cost. Besides, it largely improves thedurability index of concrete impermeability, freeze-thaw resistance,anti-carbonization, and it also increases concrete strength at later stage aswell as physical and mechanical properties of concrete.

In order to keep good pumpabilityand construction performance of concrete within required time, concrete retarder can effectively controlslump loss and fluidity loss of commercial ready-mix concrete and flowingconcrete which is mixed with pumping agent and superplasticizer. Also, it can well inhibit thehydration reaction speed at early stage and induction period of cementhydration, and prolong setting time and plasticity-maintaining time of concretewith over 7 hours of delayed initial setting time and final setting time.

Technical Specifications

Items	Required Parameter Value in the Standard	Test result of our product
Visual Appearance	White or yellowish crystal powder	White or yellowish crystal powder
Loss on drying (%)	≤0.5	0.26
Purity (%)	98.0 – 102.0	99.21
Reducing Substances (%)	≤0.7	0.34
Heavy Metal, as Pb, ug/g	≤10	＜ 10
Sulfate (%)	≤0.05	＜ 0.05
Chloride (%)	≤0.07	＜ 0.07
Lead (ug/g)	≤2	＜ 2
Arsenic (ug/g)	≤2	＜ 2
PH value	6.2-7.8	6.80

Dosageand Uses
1. Dosage of concrete retarder ranges from 0.05% to 0.15% of the weight ofcementing material.
2. Initial slump of concrete retardermixed with naphthalene superplasticizerranges from 170mm to 180mm, with product dosage reaching 0.05% andnaphthalene superplasticizerdosage reaching 0.75%. It has no slump loss and fluidity loss within two orthree hours.

Packaging
Concrete retarder is packedin woven bag with plastic liner, with each bag weighing 25 kg.

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