High Strength Concrete - A Practical Guide by Michael A. Caldarone

By Michael A. Caldarone

This sensible ebook from a hugely skilled writer offers essentially the ability and strategies for designing, generating and utilizing high-strength concrete.
High-strength concrete bargains many advantages. better compressive strengths permit for a discount within the cross-sectional dimensions of columns and partitions in structures. Its higher stiffness enables expanding construction heights whereas controlling sway and occupant convenience. Civil constructions comparable to bridges have benefited from larger span lengths, shallower beam sections, wider girder spacing, and prolonged carrier life.
Illustrated with actual existence examples, via documented case histories, High-Strength Concrete could be a useful source for contractors, manufacturers, inspection businesses, in addition to engineers and researchers.

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It is true that in some instances durability correlates well with strength, particularly in cases where the durability property under consideration is proportional to the coefficient of permeability. In such cases, measures required for enhancing durability also result in higher strength. However, in other cases, the opposite holds true; measures taken to produce high strength can be detrimental to durability. For example, the durability of concrete subjected to cycles of freezing and thawing while saturated or in the presence of deicing agents is much more dependent upon the quality of an entrained air-void system than it is on strength.

Less common, but equally important objectives, if necessary, might involve satisfying requirements for modulus of elasticity, creep, heat of hydration, or shrinkage. Historical background In the last 40 years, the compressive strength of commercially produced concrete has approximately tripled, from 35 MPa (5000 psi) to 95 MPa (14,000 psi). This unprecedented escalation in strength was largely made possible because of the following factors: • • • advancements in chemical admixture technology; increased availability of mineral admixtures (supplementary cementing materials); and increased knowledge of the principles governing higher-strength concretes.

Calorimeter and mini-slump tests performed on mixture-representative paste samples can be very useful in identifying potential material incompatibilities. Pastes should be prepared representing the sequence in which additives are to be introduced and in the range of concrete temperatures anticipated for the work. 4 Various forms of calcium sulfate (CaSO4) Chemical composition Gypsum (calcium sulfate dihydrate) Hemihydrate (calcium sulfate hemihydrate) Anhydrite (anhydrous calcium sulfate) CaSO4 · 2H2O CaSO4 · 1⁄2H2O CaSO4 Constituent materials 27 1111 2 3 4 5 6 7 8 9 1011 1 2 3111 4 5 6 7 8 9 20111 1 2 3 4 5 6 7 8 9 30111 1 2 3 4 35 6 7 8 9 40111 1 2 3 4 45111 Unfortunately, there is currently no worldwide standardization system for classifying hydraulic cement.

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