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 […]

Don’t Ignore Cracks and Joints Underneath Decorative Overlays

“Overlays are not designed to repair cracks,” says Tim Lowe of Increte Systems. But if a crack is left unrepaired it will result in problems, including causing the overlay to crack and fail itself. Crack must always be cleaned prior to repair. Lowe suggests filling cracks with an epoxy and then broadcasting silica sand over […]