We rely on concrete to support demanding needs in virtually all new construction. Small variations in the coarse or fine aggregates in the concrete mix can have a dramatic effect on the concrete’s overall performance. The size, shape, absorption and texture of aggregates will impact the strength, durability and workability of the concrete.
High quality aggregates are becoming scarce and increasingly difficult to find. The scarcity of quality aggregates is leading to the increased use of lower quality aggregates. For example, many fine aggregates contain high levels of swellable clays. These clays may absorb water and chemicals, which can lead to poor workability, lower strength, and increased shrinkage and cracking. This can lead to repair costs that place a major burden on contractors.
With the use of lower quality aggregates on the rise, many contractors are relying on their ready mix concrete producers to use chemical admixtures that minimize the impact of using poor quality aggregates. For example, clay mitigating, water reducing admixtures help to mitigate the detrimental impact of swellable clays, resulting in higher-quality concrete.
This approach allows more aggregates to be sourced locally, resulting in lower costs. More importantly, this water-reducing concrete admixture solution ensures concrete is workable, consistent and high-quality.
April 30, 2018
Reducing your carbon footprint with admixtures
Cement is the world’s most prevalent man made material, with approximately 0.56 tons produced annually for every person on earth. It binds concrete, which is used to construct much of the built enviro...
December 04, 2017
Achieving high flow with reinforced concrete
Concrete producers will often add synthetic macro fibers into their concrete to improve its toughness and durability. This is much easier than physically placing welded wire mesh, which can be labor-i...
December 17, 2018
How two buildings in Seattle achieved high-strength concrete
Historically, the term "high-strength concrete" (HSC) has been relative. The latest edition of "Design and Control of Concrete Mixtures" (DCCM) considers HSC to be at a "strength significantly beyond ...
May 14, 2018
P2P Initiative can advance further via in-transit concrete management system
One of the National Ready Mixed Concrete Association’s (NRMCA) goals is to advance the industry away from prescriptive specifications into more versatile performance specifications†. Officially known ...
May 31, 2018
Why the ASTM C94 revision to accept water additions in transit matters
In 2013, the ASTM C94/C94M Standard Specification for Ready-Mixed Concrete was revised to allow water additions during transit, for trucks equipped with automated slump and water management systems. Y...
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