Honest answers on cure time, cracking, hot and cold weather pours, and pour conditions. Written in foreman voice, not classroom voice.
Light rain before the pour is usually fine — rain in the first 2–4 hours after placement is what ruins slabs. The honest field answer for slabs, footings, driveways, walls, and fence posts.
Read articleThe best temperature is 50–60°F, workable 40–90°F. The minimum, the maximum, and the best temperature for driveways, slabs, and foundations.
Read articleIdeal is 50–70°F. The full curing temperature chart, the minimum where curing stops, the maximum that hurts strength, and how temperature drives cure time.
Read article24-hour, 7-day, 28-day milestones in plain English. Plus the weather conditions that quietly wreck them before the truck pulls away.
Read articlePlastic shrinkage, drying shrinkage, restraint cracking — what causes each, what you control, and how to stop having that conversation with the customer.
Read articleThree weather conditions where the right call is to push the pour. The numbers that tell you to walk away — and how to make the call at 5am.
Read articleStrength gain from 50°F to 95°F. The chart you wish you had on the truck dash.
Read articleThe four levers you can pull when conditions push your evaporation rate over the line. What works, what doesn't, and what makes it worse.
Read articleThe temperature where curing stops. The 72-hour forecast question that matters more than pour-day temperature. How to keep heat in the slab.
Read articleA deep dive on the most preventable kind of crack — the one that costs you callbacks. Causes, the 0.15 rule, and how to prevent it.
Read articleThe formula, the 0.15 threshold, and how to calculate it on the job — with or without an app.
Read articleThe formula, step by step, with two worked examples you can check by hand — and the free calculator that does it for you.
Read articleCuring methods that work, curing methods that don't, and why conditions at placement determine long-term strength.
Read articleThe hot weather concreting standard broken down for field crews — when it applies, what it requires, and how to use it.
Read articleHow evaporation rate and temperature determine whether you need a retarder or accelerator on your next pour.
Read articleHow to read slump values, acceptable ranges by application, and why slump alone doesn't tell you if conditions are safe.
Read articleThe 4–12 hour window, how hot and cold weather move it, and how deep and how far apart to cut. Miss the window and the slab picks the crack for you.
Read articlePortland-limestone cement is the new default — it bleeds less and cracks easier. What changed on the job, and the lower evaporation threshold it demands.
Read articleThe winter standard — minimum placement temperatures by section size, the 500 psi protection rule, and when the blankets can safely come off.
Read articleStrip times for walls, slabs, and beams — and why strength, not the calendar, is the real trigger. Plus how cold weather pushes every number later.
Read articleEstimate in-place strength from the concrete's own temperature history — strip forms and open to traffic on data instead of the calendar.
Read articleHow to lower concrete temperature, the 95°F discharge limit, and the plant lead times you have to plan for the day before.
Read articleWhat an evaporation retarder does, why it is not a curing compound, and how fogging and windbreaks knock down evaporation risk.
Read articleThick pours generate heat — when the core runs 35°F hotter than the surface, it cracks. What counts as mass concrete and how to control it.
Read articleRun the ACI 305R formula yourself — enter your job site conditions and get a GO, CAUTION, or WARNING result instantly.
Open CalculatorReal-time pour conditions. 16-day forecast. Pour logging. Free for contractors.