Understanding waterstops: To ensure success, one must specify for performance, install with care

Conventional or stay-in-place forming should be installed tight around thermoplastic waterstops to prevent concrete from seeping out and curing across the depth of the waterstop. Such cured concrete seepage can reduce the waterstop’s performance. Applications for hydrophilic waterstops are not limited to cast-in-place concrete construction joints. Due to their flexibility and conformability, hydrophilic waterstops can […]

What is new in ACI 301-20, Specifications for Concrete Construction – Page 5 of 5

Evaluation requirements for concrete made with self-consolidating concrete and structures that are designed for modulus of elasticity are included in the updated ACI 301-20. Section 10—Shrinkage-compensating Concrete for Interior Slabs Section 10 covers requirements for concrete made with cementitious material conforming to ASTM C845, Standard Specification for Expansive Hydraulic Cement, for interior slabs designated by […]

Contraction Joints for Radiant-Heated Floors

Editor’s Note: Kim Basham provided this article after a reader inquiry in regards to his article “Reinforcement for Crack Width Control,” which ran in the December 2009 issue of Concrete Contractor magazine. Reader inquiry: “I recently read the article by Kim Basham regarding placement of reinforcing in slabs on grade. I would be interested in […]