Internal Curing

Internal Curing

Internal curing is the process of “curing concrete from the inside out” by using prewetted lightweight aggregates that gradually release water throughout the concrete mix.

This technique, defined by the American Concrete Institute (ACI) as “a process by which the hydration of cement continues because of the availability of internal water that is not part of the mixing water,” helps reduce shrinkage, cracking, and permeability in concrete.

Arcosa Lightweight’s expanded shale and clay aggregates provide an efficient solution for internal curing, resulting in more robust, durable concrete with extended service life.

Concrete Truck Concrete Pouring Worker on Construction Concrete Structure

Key Benefits

Arcosa Lightweight aggregates provide essential internal curing for concrete, reducing shrinkage and cracking, enhancing durability, and supporting long-term structural integrity.

Reduced Shrinkage and Cracking

By gradually releasing water into the concrete mix, Arcosa Lightweight aggregates help keep pores in the cement paste saturated, which mitigates shrinkage and cracking during the early stages of curing. This continuous hydration prevents common issues such as early-age curling, warping, and cracking.

Enhanced Durability and Strength

Internal curing with Arcosa Lightweight aggregates improves hydration throughout the entire concrete structure, reducing permeability and increasing resistance to chloride penetration. The result is a more durable, resilient material that better withstands environmental stresses, including freeze-thaw cycles and exposure to salts.

Compatibility with Supplementary Cementitious Materials (SCMs)

Arcosa aggregates facilitate internal curing that complements the increased water demand of SCMs like fly ash, slag, and silica fume. This makes internal curing particularly advantageous for high-performance and sustainable concrete mixes that incorporate SCMs at higher dosage levels.

Featured Case Studies

Structural Lightweight Concrete

Kansas Department of Transportation (KDOT) Bridge Deck Study: Advancing the Use of Internal Curing

Since 2016, the Kansas Department of Transportation (KDOT), along with the University of Kansas (KU) and the State of Minnesota, has been studying the use of internal curing to improve bridge deck service life. Traditional concrete bridge decks, with their high cementitious materials content and low water-to-cement ratio, are prone to early age cracking and self-desiccation.

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Internal Curing

TVA Utilizes Internal Curing for Historic Hydroelectric Dam’s Bridge Deck

The Wilson Dam bridge deck, part of the iconic 100-year-old hydroelectric dam on the Tennessee River in Muscle Shoals, Alabama, is ready handle another century of traffic. Arcosa Lightweight’s material played a pivotal role in these extensive repairs, ensuring the bridge’s longevity by supporting the Tennessee Valley Authority’s (TVA) first-ever use of internally cured concrete.

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Lightweight Concrete Masonry

A Look Back at the Union Pacific Dallas Intermodal Terminal (DIT)

The Union Pacific Dallas Intermodal Terminal (DIT) project stands as a testament to the transformative benefits of lightweight aggregate in improving the durability, strength, and overall performance of concrete paving. Notably, it remains one of the largest internal curing paving projects in the United States, with over 250,000 cubic yards of concrete used.

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How Arcosa Lightweight
Works in Internal Curing

Internal Water Reservoirs

Internal Water Reservoirs

Arcosa’s lightweight aggregates act as internal reservoirs, gradually releasing water to support continuous hydration throughout the concrete mix.

Minimizing Shrinkage and Cracking

Minimizing Shrinkage and Cracking

By keeping the concrete pores saturated, Arcosa aggregates reduce early-age shrinkage and cracking, improving the concrete’s overall durability and lifespan.

Enhanced Density and Durability

Enhanced Density and Durability

Continuous hydration facilitated by internal curing results in a denser, more durable concrete structure, offering increased resistance to chloride ingress and environmental stresses.

Why Choose Arcosa Lightweight for Internal Curing?

  • Proven Performance: Arcosa Lightweight aggregates are utilized in a variety of high-performance concrete applications, providing enhanced durability and resilience where it’s needed most.
  • Sustainability Commitment: By reducing maintenance needs and extending the lifespan of concrete structures, Arcosa Lightweight aggregates support sustainable building practices across various industries.
  • Expert Support: Arcosa offers in-depth technical support for implementing internal curing, ensuring that concrete mixes are optimized for maximum performance.
Expert Photo

Ask our Expert: 1-800-342-LITE

Clint Chapman is the Western Region Marketing & Technical Manager for Arcosa Lightweight. Clint is an NRMCA Certified Concrete Technologist – Level 3, with over 20 years’ experience in the concrete industry. The vast majority of which has been in the Lightweight Aggregates industry, with a focus on structural lightweight concrete.

Concrete Pouring

Additional Related Articles

Ask our Expert: Internal Curing of Concrete

By: Clint Chapman

Internal curing is an innovative approach that provides concrete with much-needed internal water, helping prevent early age shrinkage and enhancing cement hydration. With extensive expertise in lightweight aggregates, Clint Chapman explains the mechanics, benefits, and applications of internal curing, sharing insights into how this process can enhance concrete durability and performance.

Read More

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