Author: Raymond Leonard Blaine
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 52

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Author: Raymond Leonard Blaine
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 132

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Author: Raymond Leonard Blaine
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 54

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Author:
Publisher:
ISBN:
Category : Building materials
Languages : en
Pages : 24

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Author: Sidney H. Greenfeld
Publisher:
ISBN:
Category : Roofing, Bituminous
Languages : en
Pages : 28

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Sixteen years of outdoor weathering of laboratory-prepared smooth-surface and mineral-surfaced, felt-base roofing specimens has provided information on the effects of mineral additives on the durability of coating-grade roofing asphalts. Six finely divided mineral additives (blue black slate, clay, dolomite, fly ash, mica, and silica) were evaluated at concentrations up to 60 percent in California, Mid Continent and Venezuela asphalts. The mineral-surfaced specimens are all performing satisfactorily, and show only minor degrees of degradation. Of the smooth-surfaced specimens, the Mid-Continent asphalt performed the best and the California asphalt the poorest. The mica and blue black slate increased the durabilities of all three asphalts at all concentrations and two coating thicknesses. Fly ash, clay, dolomite, and silica were beneficial in some combinations, but had little effect in others. In general, these early results from outdoor exposure tend to corroborate the results obtained on these coatings exposed in weatherometers. (Author).

Author: United States. National Bureau of Standards
Publisher:
ISBN:
Category : Building
Languages : en
Pages : 860

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Author:
Publisher:
ISBN:
Category : Weights and measures
Languages : en
Pages : 858

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Author: William C. Cullen
Publisher:
ISBN:
Category : Building materials
Languages : en
Pages : 28

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The resistance of bituminous built-up roofing membranes to thermally induced forces is considered in terms of their strength properties such as breaking load in tension, modulus of elongation and apparent linear thermal expansion coefficient.The development of a Thermal-Shock Resistance Factor is described and values are given for three bituminous built-up membranes at temperatures of - 30F (-34.4C), 0F (-17.8C), 30F (-1.1C) and 73F (22.8C).The apparent relation between the values obtained in the laboratory and the observed performance of roofing membranes in service is considered.The utilization of the Thermal-Shock Resistance Factor in the reduction of potential failures of bituminous built-up roofing membranes in service from thermally induced forces is also discussed.(Author).

Author: Perry H. Petersen
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 24

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The loss of prestress resulting from creep and shrinkage in concrete was investigated for concrete specime * ns made with Type I portland cement and with Type III portland cement.Forty-nine sets of specimens were fabricated and tested; each set consisted of a prestressed specimen and an otherwise identical companion specimen without reinforcement. The length changes with time were observed at intervals up to an age of 500 days.These observations were made for concretes subjected to different levels of prestress, and for concretes prestressed at different ages.Length changes in nonreinforced companion specimens were also obtained. Thus this study is concerned with elastic deformation occurring at time of stress transfer, shrinkage or swelling, and creep.(Author).

Author: United States. National Bureau of Standards
Publisher:
ISBN:
Category : Weights and measures
Languages : en
Pages : 172

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