High-Strength Concrete
High-Strength Concrete
The definition of high strength concretes is continually developing. In the 1950s 34N was considered high strength, and in the 1960s compressive strengths of up to 52N were being used commercially. More recently, compressive strengths approaching 138N have been used in cast-in-place buildings. High-strength concrete columns can hold more weight and therefore be made slimmer than regular strength concrete columns, which allows for more useable space, especially in the lower floors of buildings.
Quality control and testing of high-strength concrete
The American Concrete Institute has recently published a new Guide to Quality Control and Testing of High-Strength Concrete. The guide applies to concrete with a specified compressive strength of 6,000 psi (40 MPa) or greater. It covers planning, trial mixtures, preconstruction meetings, batching, placing, curing and testing....
Accelerated curing of high-strength concrete
The use of accelerated curing in the production of precast members has been an industry practice for many years. Early research focused on developing curing cycles to optimize concrete strength while providing economy and efficiency in plant production. ...
Match curing for high-strength precast
With precast products, a minimum concrete compressive strength is required before the unit can be removed from the casting bed. Consequently, heat curing is often used to accelerate the early-age strength gain. With conventional strength concrete, the early-age strength requirement usually controls the selection of concrete mix proportions and the specified 28-day strengths are easily exceeded....
High volume ash mixes gain strength and acceptance
New mix technology delivers stronger, less permeable and more architecturally pleasing concrete at Ocean Journey, providing Denver a facility with a service life of many years. ...
High-Strength Concrete Resources Around the Web
Rampart Hydro Services
Specialty concretes such as latex modified concrete, micro-silica, high-strength concretes can be removed using hydrodemolition. Hydrodemolition systems operating at 15,000-psi to 20,000-psi may not be able to remove high-strength concretes. Typically, the water jet pressure must be 3.5 times the compressive strength of the concrete for effective hydrodemolition. Copyright © 2005, Rampart Hydro Services, L.P., Pittsburgh, PA, U.S.A. All rights reserved. Retrieved on 1/10/07 from http://www.rampart-hydro.com/high-strength_concrete.htm...
High-strength concrete
The primary difference between high-strength concrete and normal-strength concrete relates to the compressive strength that refers to the maximum resistance of a concrete sample to applied pressure. Although there is no precise point of separation between high-strength concrete and normal-strength concrete, the American Concrete Institute defines high-strength concrete as concrete with a compressive strength greater than 6000 psi (41 MPa). Portland Cement Association (2007) - All Rights Reserved. High Strength Concrete. Retrieved on 1/10/07 from http://www.cement.org/basics/concreteproducts_histrength.asp...
