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If we fog spray flatwork to help prevent shrinkage cracking, is there any danger of increasing the water-cement ratio at the surface and reducing the strength of the concrete?
High durability concrete has both positive and negative consequences for decorative concrete contractors.
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Water plays a crucial rule in hydrating cement, but also can cause big problems.
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Under what conditions are we allowed to retemper ready-mixed concrete at the jobsite? If we receive a batch that has too low a slump, can we add water to make the concrete more workable?
Because my degree is in naval architecture and marine engineering, things that float interest me.
In February of 2009, CONCRETE CONSTRUCTION and Scurto Cement, Gilberts, Ill., decided to do a two-year warehouse floor study to monitor curling.
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I know that entrained air improves concrete's resistance to freeze/thaw damage, but why would air-entrained concrete be required in an area where freeze/thaw isn't an issue?
Many specifying authorities seek to assure the quality of concrete provided to them by choosing a prescriptive approach that narrowly defines the quality or source of raw materials, and the proportions in which they are used.
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Facts can lead to an exercise in futility when the smoothness of evaluation and interpretation are disrupted because they are distorted or missing.
This month's analytical development ties together all of the facts of the streak and etching problems.
In the arena of retail construction, time and creativity are equally paramount. Failure to meet a proposed deadline simply is not an option.
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There is a misconception that a high concrete strength means good durability. This is true until the strength reaches a level where the concrete becomes brittle and prone to cracks. Concrete in the U.S. has moved well beyond this point. Because of this misconception, a number of mistakes have been...
At Concrete Construction's first Industry Trends Roundtable in June 2002, the hot topic was moisture coming out of concrete floors and delaminating vinyl flooring, tile, and coatings.
When even lower unit weight concrete is needed, or higher insulation value, cellular concrete is the solution.
Concrete producers and all their suppliers are eagerly awaiting the roll out of projects demanding millions of cubic yards of concrete.
This is the second in a series of articles about our warehouse floor field test. The purpose of the study is to find economical ways to reduce curling in warehouse floors and to study the rate of moisture loss in concrete after placement.
Concrete that flows into rebar-congested forms under its own weight, with no vibration and no segregation, is the dream of every contractor.
It's possible that you as a contractor will never have to face up to the problems that air entrainment can cause when it's either too high or too low in concrete.
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When we discussed hydration last month, it dealt mostly with calcium hydroxide (Ca(OH) or CH), which seemed like a good way to introduce the subject—after all, calcium hydroxide constitutes about 20% to 25% of the portland cement paste.
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I've heard many times that changing the water-cement ratio in concrete has a large effect on its strength. The question is, why?