Description
High-range water-reducing admixtures can increase the strength of concrete and provide greatly increased workability without adding more water. Consequently, the use of high-range water-reducing admixtures is increasing substantially in the concrete industry. This guide contains information on the effects of these admixtures on the properties of fresh and hardened concrete, the uses of concrete, and the quality control of the concrete. This guide is designed for concrete suppliers, contractors, designers, specifiers, and all others engaged in concrete construction.
Keywords: admixture; batch; consolidation; high-range water-reducing
admixture; mixture; mixture proportion; plasticizer; portland cement;
quality control; water-reducing admixture; workability.
Table of Contents
Chapter 1—General information
1.1—Introduction
1.2—Specifications
Chapter 2—Effects of high-range water-reducing admixture
2.1—General effects
2.2—Mechanisms
2.3—Fresh concrete properties
2.4—Hardened concrete properties
2.5—Increase in the efficiency of construction
2.6—Enhanced design and engineering of concrete structures
Chapter 3—Effects on freshly mixed concrete
3.1—General
3.2—Water reduction
3.3—Slump
3.4—Time of setting
3.5—Air entrainment
3.6—Segregation
3.7—Bleeding
3.8 — Pumpability
Chapter 4—Effects on hardened concrete
4.1—Compressive strength
4.2—Tensile strength and modulus of elasticity
4.3—Bond to reinforcement
4.4—Temperature rise
4.5—Drying shrinkage and creep
4.6—Freezing-and-thawing resistance
4.7—Durability
Chapter 5—Typical applications of high-range
water-reducing admixtures
5.1—General
5.2—High-strength concrete
5.3—Precast/prestressed concrete
5.4—Architectural concrete
5.5—Parking and bridge structures
5.6—Rapid-cycle high-rise projects
5.7—Industrial slabs
5.8—Massive concrete
Chapter 6—Quality control
6.1—Introduction
6.2—Water-cementitious material ratio and slump control
6.3—Redosing to recover lost slump
6.4—Placement of flowing concrete
6.5—Temperature considerations
Chapter 7—References
7.1—Referenced standards and reports
7.2—Cited references