Author: Waterways Experiment Station (U.S.)Publisher:
ISBN:
Category : Aggregates (Building materials).
Languages : en
Pages : 104
Book Description
Laboratory Investigation of Certain Limestone Aggregates for Concrete
Author: Waterways Experiment Station (U.S.)Publisher:
ISBN:
Category : Aggregates (Building materials).
Languages : en
Pages : 104
Book Description
Laboratory Investigation of Certain Limestone Aggregates for Concrete
Author: Bryant MatherLaboratory Investigation of Certain Limestone Aggregates for Concrete
Author: Publisher:
ISBN:
Category : Aggregates (Building materials)
Languages : en
Pages : 94
Book Description
Laboratory Investigation of 4-1/2-in. Aggregate Concrete Mixtures with High Water-cement Ratios
Author: William O. TynesPublisher:
ISBN:
Category : Aggregates (Building materials).
Languages : en
Pages : 44
Book Description
The purpose of the investigation was to either validate or disprove the assumption that a water-cement ratio (W/C) in excess of 0.8 by weight for interior concrete containing 4-1/2-in. maximum size aggregate can be used in mass concrete construction, and to compare the properties of concrete containing 4-1/2-in. maximum size aggregate with those of the concretes containing 3- and 6-in. maximum size aggregates. The investigation consisted of a laboratory test program in which a series of six lean mass concrete mixtures, both with and without pozzolan, containing 4-1/2-in. maximum size aggregate were proportioned with identical W/C's that had been selected from the work of a previous investigation. Specimens were cast and tests were made to evaluate the mixtures for workability, strength, permeability, and durability.
Investigation of a Reaction Involving Nondolomitic Limestone Aggregate in Concrete
Author: Alan D. BuckPublisher:
ISBN:
Category : Aggregates (Building materials).
Languages : en
Pages : 54
Book Description
Laboratory Investigations of Concrete Aggregate and Riprap, Braziel Damsite, North Platte Project, Nebraska
Author: E. I. SkillmanConcrete, Cement, and Aggregate Research
Author: Publisher:
ISBN:
Category : Cement
Languages : en
Pages : 18
Book Description
Atchison limestone was found to be unsatisfactory in freezing and thawing and its use in concrete has been discontinued. However, additions of 30 percent limestone aggregate were beneficial in controlling cement-aggregate reaction. Admixtures used in this investigation did not materially reduce cement-aggregate reaction and in some cases they appeared to increase reactivity. All Class A concretes were more durable in freezing and thawing than Class 46B concretes. Also air-entrained sand-gravel concretes were more durable in freezing and thawing than non-air-entrained sand-gravel concretes. Due to parallel to centerline placement of reference plugs, length change measurements of the pavement were of little or no value. Also dowel bars across the centerline tied two sections together, causing each section to influence the behavior of the other. This type of experimental layout should be avoided in future investigations. Beams fabricated with Platte river sand-gravel in combination with a low alkali cement (Av. 0.29% equivalent alkali) expanded from 0.3 percent to over 0.5 percent during ten to twenty years in an outdoor exposure yard. (Author)
Aggregates for Mass Concrete
Author: Waterways Experiment Station (U.S.)Publisher:
ISBN:
Category : Aggregates (Building materials).
Languages : en
Pages : 58
Book Description
Tests of Aggregate Samples Proposed for Chain of Rocks Low Water Dam No. 27
Author: United States. Army. Corps of Engineers. Lower Mississippi Valley Division. Materials and Concrete LaboratoryPublisher:
ISBN:
Category : Aggregates (Building materials).
Languages : en
Pages : 134
Book Description
Mineral Aggregates
Author: National Research Council (U.S.). Highway Research BoardPublisher:
ISBN:
Category : Language Arts & Disciplines
Languages : en
Pages : 124
Book Description