Set Retarding Admixture 

Product Description

SR is a ready-to-use liquid admixture for making better, more uniform and more predictably high quality concrete. It retards the setting time to facilitate placing and finishing. Concrete meeting architectural, structural and construction requirements is obtained more dependably and economically with SR.

Recommended For

SR admixture is recommended for use in all types of concrete where retardation of set, improved performance and pumpability are required or desired. SR admixture improves pumped concrete, shotcrete (wet mix) and conventionally placed concrete; it improves plain, reinforced, precast, pre-stressed, light-weight or standard weight concrete. It can be used in white or colored concrete. SR can be used with air entraining agents; it improves the efficiency of most air-entraining admixtures and will generally result in the need for less air-entraining admixture. When used in conjunction with another admixture, each admixture must be dispensed separately into the mix.

Features and Benefits                  

SR admixture aids in the production of concrete with these special qualities.

greater pumpability

superior finishing characteristics for slab-work and off-form surfaces

mild to extended retardation - depending on dosage

reduced water content for a given consistency

increased strength - compressive, flexural and bond of concrete to steel

greater economy in a mix designed for a given strength, slump and air content

minimum cracking

easier placement - economy in placement

greater durability

reduced segregation, particularly in lean mixes and high slump concrete

slip-formed concrete

Addition Rates

The temperature of the concrete mix and the ambient temperature (forms, earth, reinforcement, air, etc.) affect the rate of hardening of the concrete. At higher temperatures concrete hardens more rapidly and may impose problems with placing and finishing of concrete. By varying the dosage of SR, concrete with a more desirable rate of hardening characteristic can be obtained.

Since setting time is also influenced by the chemical and physical composition of the basic ingredients of the concrete, trial mixes should be made with the job materials approximating job conditions to determine the dosage required for a given degree of retardation.

SR is used at the rate of 250±50ml per 100kg cement. Similar dose rates may be used with blended cements.

Packaging & Storage

SR is supplied in 205 litre sealed drums and bulk delivery.

Set Retarding Admixture