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https://theconstructor.org/concrete/concrete-retarders-mechanism-types/26633/
In this article we discuss about the mechanism of retardation, types of retarders, effect of retarders on concrete properties and advantages. Mechanisms of Retardation. Adding a retarder, dissolved in the mixing water or sprayed on the surface of the concrete, temporarily interrupts the hydration reactions, which creates a longer dormant period.Author: Fasi Ur Rahman
https://www.engr.psu.edu/ce/courses/ce584/concrete/library/materials/Admixture/AdmixturesMain.htm
Careful usage of retarder is required to avoid excessive retardation, rapid slump loss and excessive plastic shrinkage. ... This admixture can also be used for long haul concrete delivery and to maintain slump. Factors affecting the use of this admixture include the …
https://www.concreteconstruction.net/how-to/materials/retarders-for-concrete_o
Retarders are primarily intended to counteract the harmful results of heat on the concrete mix; they lower the water/cement ratio only as a side effect. Just remember, don't use retarders in cold weather. Naturally, all other things being equal, the more retarder that is added to …
https://www.concreteconstruction.net/concrete-production-precast/its-about-time_o
Most states limit concrete delivery to 60 minutes from the time water hits the cement to the time of discharge. ASTM C94, “Standard Specification for Ready-Mixed Concrete,” allows for 90 minutes until discharge. These are relatively safe time frames considering the impact on the quality of the concrete.
https://www.concretedecor.net/decorativeconcretearticles/vol-17-no-3-april-2017/concrete-surface-retarders-deliver-practical-results-with-a-little-artistry/
Apr 03, 2017 · Euclid Chemical carries three different concrete surface retarders. Concrete Surface Retarder Formula S is for use on flatwork and provides aggregate exposures from 1/8 to 3/16 inch. Concrete Surface Retarder Formula F is for painting on forms for vertical surfaces and provides an etch of up to 1/4 inch deep.
https://theconstructor.org/concrete/effect-of-transit-time-on-ready-mix-concrete/8754/
When the transit time of ready mix concrete is high, the initial setting of concrete may take place. To avoid setting of concrete, retarding admixtures can be used to prolong the setting of concrete. While permitting use of retarder, it should be ensured that the suitability and dose of retarder is decided after conducting necessary trials.
https://www.cranesville.com/additives/
Retarder. Slows the set rate of concrete and is used to counteract the accelerating effect of hot weather on concrete setting. High temps cause an increase rate of hardening which makes placing and finishing difficult. The product keeps concrete workable and delays the initial set time. Applications: Warm weather or long travel time projects.
https://www.euclidchemical.com/products/admixtures/miscellaneous-products/evaporation-retarders/concrete-surface-retarder/
CONCRETE SURFACE RETARDER F & S are chemical formulations which retard, but do not “kill” the set of the mortar at the surface of concrete. When the underlying concrete has hardened, the retarded mortar surface can be flushed off with a stream of water and/or removed by scrubbing with a stiff brush.
https://www.concretenetwork.com/concrete/exposedaggregate/surface-retarder.html
What is concrete surface retarder? Surface retarders, also called surface “deactivators,” are applied to fresh concrete to chemically delay the set of the surface mortar. Unlike concrete set retarders, they allow the rest of the concrete to cure normally, without affecting the setting rate or strength gain.
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