Interes simple
Standard Practice for Selecting Proportions for
Structural Lightweight Concrete (ACI 211.2-98)
Reported by ACI Committee 211
Jay R. Prestera
Secretary
Edward A. Abdun-Nur
Stanley G. Barton*
Leonard W. Bell
George R. U. Berg
Stanley J. Blas, Jr.
Peggy M. Carrasquillo
Ramon L. Carrasquillo
Martyn T. Conrey
James E. Cook
Russell A. Cook*
William A. Cordon
Wayne J. Costa
Kenneth W. Day
Calvin L. Dodl*
Donald E. Graham
Michael Boyle
Chairman
George W. Hollon*
William W. Hotaling, Jr.
Robert S. Jenkins
Paul Klieger
Frank J. Lahm
Stanley H. Lee
Gary R. Mass
Richard C. Meininger
Richard W. Narva
Leo P. Nicholson
James E. Oliverson
James S. Pierce
Sandor Popovics
Steven A. Ragan
Harry C. Robinson …ver más…
211.2-13
4.1General background
4.2Method 1 : Weight method (specific gravity pycnometer)
4.3Method 2: Volumetric method (damp, loose volume)
4.4Adjustment procedures
4.5Controlling proportions in the field
Chapter 5—References, p. 211.2-15
5.1Specified and/or recommended references
5.2Cited references
Appendix A—Determination of specific gravity factors of structural lightweight aggregate,
p. 211.2-16
Appendix B—Determination of structural lightweight coarse aggregate absorption,
p. 211.2-17
Appendix CMetric system adaptation, p. 211.2-18
CHAPTER 1—INTRODUCTION
1.1—Purpose
The purpose of this standard is to provide generally applicable methods for selecting and adjusting mixture proportions for structural lightweight concrete. These methods are also applicable to concretes containing a combination of lightweight and normal weight aggregate.
1.2 Scope
Discussion in this standard is limited to structural grade, lightweight aggregates, and structural lightweight aggregate concretes. Structural lightweight aggregate concrete is defined as concrete which: (a) is made with lightweight aggregates conforming to ASTM C 330, (b) has a compressive strength in excess of 2500 psi at 28 days of age when tested in accordance with methods stated in ASTM C 330, and (c) has an air dry weight not exceeding 115 lb/ft3 as determined by ASTM C 567. Concrete in which a portion of the lightweight