High Strength Concrete A practical guide

High Strength Concrete A practical guide

Perhaps an appropriate way to begin this book is not to discuss what highstrength
concrete is, but rather, what it is not. Having the word “strength”
in its name undeniably suggests a bias towards one property only; however,
high-strength concrete can be an advantageous material with respect to other
properties, both mechanical and durability related. Nevertheless, it is
crucially important to recognize that the achievement of high strength alone
should never summarily serve as a surrogate to satisfying other important
concrete properties. It would seem logical that strong concrete would be more
durable, and in many respects, the lower permeability that comes along with
higher strength often does improve concrete’s resistance to certain durabilityrelated
distress, but unlike strength, the prerequisites for durability are not
easily defined. In fact, depending on the manner in which higher-strength is
achieved, the durability of high-strength concrete could actually diminish.

There are extraordinary differences when comparing the properties of
a very high-strength concrete having a compressive strength of 140 MPa
(20,000 psi) to that of a conventional-strength structural concrete with a
compressive strength of 30 MPa (4000 psi). When considering the adjustments
to the principles of mix proportioning necessary in order to satisfy
mixture performance requirements, it is interesting to note that no abrupt
change in material technology occurs at any one particular level of strength,
or at a particular water–binder (W/B) ratio. Rather, the changes that occur
when progressing up the strength ladder are quite subtle with each advancing


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December 15, 2017 at 11:14 PM delete

How can I download these books please