Author: N. B. Aughenbaugh
Publisher:
ISBN:
Category : Aggregates (Building materials)
Languages : en
Pages : 77
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Book Description
An investigation has been made of the mechanics of constricution compaction degradation, the properties of mineral aggregates that influence degradation, and existing laboratory tests for evaluating degradation susceptibility. Field investigations consisted of concrete-base tests. Laboratory tests investigated were the Los Angeles abrasion, the mechanical kneading compactor, repetitive loading, the modified AASHO, freeze-thaw, and absorption and specific gravity. Petrographic studies included megascopic and microscopic examination, X-ray analysis, differential thermal analysis, insoluble residue analysis, and chemical analysis. The greatest degradation to the aggregate mass occurs during the first compactor pass, with progressively less breakage resulting from each successive pass. Degradation and density are interrelated and are affected by each other. One-size materials are the most susceptible to degradation and dense-graded materials are the least susceptible. No single laboratory physical test can be used to evaluate aggregate degradation quality, although the Los Angeles test suffices for unweathered carbonate aggregates. Freeze-thaw action lowers the degradation quality of aggregates. Petrographic analysis is a reliable means of evaluating degradation quality and is recommended as a routine laboratory test. (Author).
Author: Waterways Experiment Station (U.S.)
Publisher:
ISBN:
Category : Aggregates (Building materials).
Languages : en
Pages : 66
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Author:
Publisher:
ISBN:
Category : Frozen ground
Languages : en
Pages : 176
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Author: Terry R. West
Publisher: Highway Research Board
ISBN:
Category : Mathematics
Languages : en
Pages : 108
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Book Description
A study was undertaken to develop procedures for predicting the amount and effects of degradation for different natural aggregates when used in a roadway base or subbase course, and thereby for determining their suitability, aggregate samples were collected from 140 quarries in 12 states, divided into four classes (carbonates and clastic sedimentaries, coarse-grained igneous and metamorphics, basalts and basalt-like rocks, and heterogenous gravels), and submitted to eight tests: percent loss, Los Angeles abrasion; freeze-thaw loss; specific gravity, percent absorption; insoluble residue; differential thermal analysis; x-ray diffraction analysis; and petrographic analysis, including a battery of tests for polished and thin section. Test conclusions regarding the four classes are given and discussed, and detailed data on samples are tabulated in appendices.
Author: Terry R. West
Publisher:
ISBN:
Category :
Languages : en
Pages : 94
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Author:
Publisher:
ISBN:
Category : Aggregates (Building materials)
Languages : en
Pages : 148
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Book Description
The objective of this research is to establish the technical engineering and cost analysis concepts that will enable WisDOT management to objectively evaluate the feasibility of switching construction specification philosophies for aggregate base. In order to accomplish this goal, field and laboratory testing programs were conducted on existing HMA pavements and on base layers under construction as well as comprehensive survey was conducted on highway agencies practices pertaining to base layer construction in the U.S. and Canada. This research proposed construction specifications for aggregate base course layers.
Author: Ernest Theodore Selig
Publisher: Thomas Telford
ISBN: 9780727720139
Category : Business & Economics
Languages : en
Pages : 468
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Book Description
This comprehensive study provides practical advice and guidance on the important topics of rail transport and ground engineering, the use of which will result in optimum quality with the minimum maintenance effort and the most economical use of resources. The authors have synthesized all of their international knowledge and experience in this field, and produced, for the first time, a definitive guide for the design, construction, maintenance and renewal of railway track as they relate to geotechnology.
Author:
Publisher:
ISBN:
Category : Highway engineering
Languages : en
Pages : 1058
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Author: Cold Regions Research and Engineering Laboratory (U.S.)
Publisher:
ISBN:
Category : Arctic regions
Languages : en
Pages : 478
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Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 776
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