Concrete Mixtures and Construction Needs


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Title: Concrete Mixtures and Construction Needs

Author(s): James M. ShilstoneE, Sr. and James M. Shilstone, Jr.

Publication: Concrete International

Volume: 11

Issue: 12

Appears on pages(s): 53-57

Keywords: concrete construction; concrete durability; mix proportioning; mortars (material); rheological properties; workability; Construction

Date: 12/1/1989

Describes the problems that occur with concrete placement that contribute to progress delays, unnecessary rework, rejections and replacement, high safety factors, and variable durability. The problems are rooted in the changes that have occurred in needs and materials without comparable changes in practices. The solutions lie in providing well-balanced, consistent mixtures with good rheological properties, control and maintenance of an adequate slump, and provision of adequate mortar for pumpability and finishability. Other parameters which may be important for a particular project include low water demand, minimization of bleeding, rapid or slow time of set, and early strength to facilitate form cycling.