“Concrete Cancer”: Unveiling the Mystery of ASR in Central Texas Pools
In recent news, a concerning phenomenon has been making waves across Central Texas, causing distress among pool owners and those eager to add a pool to their home.
Dubbed as "concrete cancer," this issue has manifested in the form of major cracks and leaking affecting pools in the region. But what exactly is causing this problem, why is it only surfacing now, and most importantly, what steps can you take if your pool falls victim to this concrete affliction?
Understanding ASR
illustration: cement.org
The culprit of this issue is Alkali Silica Reaction (ASR). ASR typically stems from the accidental use of rare, highly reactive aggregate in a concrete mix. When moisture comes in contact with the reactive aggregate, a gel forms and continues to swell, further fracturing the concrete and allowing more moisture to enter, thus setting off a cycle of more moisture and more cracking.
Preventative Measures
It is imperative that you work with a pool builder who understands this serious issue and takes proactive steps to prevent ASR. Texas Tiny Pools follows these best practices on every pool to protect against ASR:
Work only with reputable concrete suppliers who test aggregates for reactivity
Utilize a concrete mix that contains pozzolans (such as fly ash, slag, or silica fume) which can reduce the permeability of concrete
Use high compressive strength concrete
Optimize reinforcement design to control shrinkage cracks
Mitigate moisture intrusion by applying waterproofing and educating homeowners about proper drainage
Identifying the Symptoms
Detecting ASR in your pool is crucial for prompt action. If you notice any leaks, keep an eye out for telltale signs such as cracking, white build-up around cracks, and separation from pool stairs and decking. The classic symptom of ASR is “map” cracking (or “alligator” cracking). These symptoms often indicate the presence of ASR and should prompt immediate investigation.
“Map” cracking (also known as “pattern” cracking or “alligator” cracking) can be a telltale sign of ASR.
Diagnosing the Issue
If you suspect ASR in your pool, it's imperative to reach out to your pool builder or maintenance company for guidance on diagnosing it. A first step that is often recommended is leak detection; for this we recommend A+ Pool Leak Detectives.
If ASR is suspected, the only way to definitively diagnose the issue is to extract a core sample from the affected pool and have it analyzed by a forensic engineering company, such as Carrasquillo Associates. Proper diagnosis is the first step towards mitigating the damage and exploring potential solutions.
Regrettably, addressing ASR in a pool often necessitates drastic measures. In most cases, the only viable solution is complete demolition and rebuilding of the pool. While this may seem daunting, it's crucial to prioritize long-term stability and safety.
The Timeline
Interestingly, the prevalence of "concrete cancer" in Central Texas pools has primarily been observed in pools constructed between 2017 and 2023. This timeframe coincides with a surge in pool construction activity, particularly during the COVID-19 pandemic. The rush to meet escalating demand may have inadvertently contributed to lapses in quality control, paving the way for ASR to rear its head in the years that followed.
Steps to Remediate
If your pool falls victim to ASR, swift action is essential to mitigate further damage. Here's what you need to do:
Contact Your Pool Builder: The first step is to inform your pool builder about the ASR diagnosis. They should guide you through the subsequent procedures, including insurance claims and necessary actions.
Prepare for Reconstruction: Unfortunately, the reality for most affected pools is the need for complete demolition and replacement.
Partner with Professionals: When it comes to rebuilding your pool, you don't have to navigate the process alone. Texas Tiny Pools is here to support you every step of the way. If you confirm ASR in your pool and are ready to rebuild, reach out to us, and we'll schedule a site visit. From managing the demolition process to obtaining city permits and designing a new pool, we'll handle it all, providing you with peace of mind amidst this challenging situation.
