Demand for high-performance concrete mixtures has increased greatly over the past several decades. Volumetric changes in hardened concrete may occur with high-performance mixtures when subject to environmental (shrinkage) or mechanical (creep) conditions. Shrinkage of concrete can lead to uncontrolled and undesired cracking that can severely affect the structure durability. Concrete creep can be significant when elements are subject to long-term stress conditions. Both mechanisms are strongly dependent on the concrete mixture materials and proportions.
Understanding early and long-term creep and shrinkage behavior of concrete is paramount for mitigating cracking and undesired deformations. Projects that require creep and/or shrinkage evaluation include long-span bridge decks, restrained mass foundations, and ultra-high rise construction.
CTLGroup’s unparalleled expertise in the volumetric performance of concrete stems from having the largest commercial creep and shrinkage laboratory in North America. Our concrete creep laboratory holds over thirty high-strength frames for evaluating the creep performance of concrete mixtures with design compressive strengths exceeding 120 MPa. We also have state-of-the-art equipment for conducting autogenous, linear, and restrained shrinkage experiments. Supported by these laboratory services, our concrete and cement-based materials experts have evaluated the creep and shrinkage performance of numerous infrastructure and high-rise buildings in the Middle East, Asia, and North America.