Concrete cancer is not a product defect, and it is not your builder's fault.
It is a chemical reaction inside the concrete itself, and it begins before the mix ever reaches your backyard. The technical name is alkali-silica reaction, or ASR. It can start the day a pool is built, it stays completely invisible for about three years, and by the time you can see it the pool cannot be repaired. Only replaced.
Full disclosure, and it is the first thing said in the episode: River Pools manufactures fiberglass pools. This is not an argument for fiberglass, and you will not hear one. Almost every pool project involves concrete somewhere, whether that is the shell, the patio, the footings, or the deck, which makes this worth understanding no matter what you are planning to build.
C. Terry Brannon, P.E., is an engineer with 50 years in engineering and 40 of those in aquatics. He writes and teaches the concrete curriculum for GENESIS, the industry's leading design and construction education program, and he sits on the Pool & Hot Tub Alliance's ASR Task Force. He has spent his career designing structures out of concrete, which is exactly why he is the right person to explain how concrete fails. He does not work for River Pools and he is not selling anything.
In this conversation, Terry walks through what homeowners actually need to know:
- The three conditions ASR requires, reactive aggregate, moisture, and a pH of 13, and why removing any one of them stops the reaction completely
- Why it starts at the concrete plant rather than with your builder, and what a builder can still do to specify and verify the mix
- What fly ash was quietly doing for decades, and what changed when coal plants stopped producing it
- Why almost every documented case traces back to one concrete placement method
- The three-year fuse, and what cracking in the first weeks of a new pool actually means
- How to tell an ASR deposit from ordinary pool scale using nothing but your thumb
- What confirmation testing costs, why the fast version of the test is no better than a coin flip, and when paying for it is not worth it
- The certificate to ask your builder for before anyone breaks ground, and why a one-year warranty will not cover this
Along the way, Terry describes a pool outside Waco that he followed over several years. The first visit turned up four or five cracks that looked suspicious. A year later there were closer to forty, and the pool was losing six inches of water a day.
None of this is a reason to avoid a concrete pool. It is rare, it is geographically concentrated, and it is entirely preventable. That is the honest headline here: preventable, not fixable. The homeowner who asks two or three specific questions before signing a contract is already ahead of the problem.
Start planning your backyard at https://www.riverpoolsandspas.com, where you'll find self-guided decision tools, a cost estimator, and hundreds of articles built to help you dot the i's and cross the t's before you break ground.
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