What Temperatures Can Concrete Repairs Be Made

Thursday, Oct. 25th 2022

October 2022 SpecTech: Common cold Weather Concrete Repair & Grouting

Construction flavor is cooling off and temperatures are starting to dip for many of you, making information technology a nifty fourth dimension to remind you of some of the challenges – and accompanying solutions – that come up with placing physical in common cold weather situations.

Cold temperatures delay fix fourth dimension and strength development of cementitious products and repair mortars. Cementitious grout and repair mortars, like concrete, must be allowed to attain a "green force" earlier beingness subjected to freezing temperatures. The following guidelines may aid recoup for cold temperature placement.

Guidelines for Grouting in Less Than Platonic Weather

Materials should be pre-conditioned/stored as necessary so that the mixed product is betwixt twoscore°F and 80°F (4°C and 27°C). Due to the mass of palletized (bagged)
material, upward to 24 – 48 hours of pre-workout may be required. Store production in an indoor or a tarped and heated area when required.
All surfaces in contact with grout or repair mortar should be preconditioned and maintained at a temperature betwixt 35°F and 90°F (2°C and 32°C) for viii – 24 hours
to remove any frost from the substrate. Presoaking the substrate with hot water (xc°F) may aid in raising concrete surface temperatures. Make certain the h2o used for
presoaking does not freeze on concrete surfaces.
Heating should be achieved past indirect exposure – do non accident oestrus direct onto newly placed grout or repair mortar surfaces. Heated enclosures should be windproof and weatherproof as much as possible. Combustion heaters must be vented and shall not be permitted to heat and dry out the product directly. Caution: Exhaust gases may contaminate or cause carbonation within the enclosed surroundings.
Apply warm or hot water to mix the products. Whenever possible utilise the least amount of h2o to allow proper placement. This will allow the production to achieve college strengths more apace, reducing the window for potential freeze damage.
Once placed, the grout/repair mortar temperature must exist maintained above 35°F (2°C) until the production reaches a minimum of thou psi (half-dozen.ix MPa) or the required strength. Applications subjected to multiple or severe freeze thaw exposure should be allowed to achieve a minimum of 3,000 psi prior to experiencing freezing temperatures. In general, SpecChem'south Grouts and Repair Mortars should be protected from freezing for a minimum of 24 hours when placed at temperatures of 35°F. Rapid setting and rapid hardening products like RepCon® 928 volition require less time under protection due to its high early on strength gain.
Once the product has attained a minimum of 1000 psi in compressive strength, gradually reduce temperature of grout to ambient temperature to avert thermal daze.

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As well, exist certain andremind your customers which products need to be kept out of the common cold and away from freezing conditions, and that storing these products at temperatures below our recommendation can impact shelf life and performance. Reference our Cold Atmospheric condition Production Storage Guide for more than details.

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Questions about cold weather concrete and grout placement, or any of our SpecChem products? Give u.s.a. a call at (816) 968-5600 or contact your local sales representative.