Concrete Strength

Grout Admixtures
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Grout Admixtures

Q: Should grout contain any special admixtures when it is used in concrete masonry... More

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Post-Tensioned Masonry: The Positive Effects of Stress

Post-tensioned masonry offers a new structural application characterized by a relatively simple construction technique and competitive cost. More

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Why Does Fog Spraying Work?
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Do Hot Weather Code Requirements Work?

What's necessary to prepare, construct, and protect masonry in hot weather? More

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Masonry Contractors Beware

The 1999 edition of the ACI 530.1/ASCE 6/TMS 602 Specification for Masonry Structures (MSJC Specification) now requires that when the mean daily temperature* exceeds 100° F or exceeds 90° F with a wind velocity greater than 8 mph, new masonry construction must be fog-sprayed until damp-and this must be repeated at least three times a day until the wall is three days old. More

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High-Strength Structural Loadbearing Masonry in Tall Buildings

An economical and proven building system, high-strength masonry is gaining popularity in high-rise buildings. More

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Retempering mortar with water

I'm confused. I am a small-sized subcontractor that contracts for work in both concrete and masonry. Most inspectors don't let us add more water to concrete. For masonry mortar, however, some inspectors let us retemper with water and some don't. I know that adding extra water to concrete lowers its strength. Doesn't extra water also lower the strength of mortar? More

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