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Author: Miguel Picornell-Darder Publisher: ISBN: Category : Nondestructive testing Languages : en Pages : 200
Book Description
The North Carolina Department of Transportation has used traditionally flexural strength tests for acceptance testing of Portland cement concrete pavements. This report summarizes a research project implemented to investigate the feasibility of using other strength tests and nondestructive tests, to accomplish the same objective of ensuring an adequate modulus of rupture of the slab but avoiding or reducing the need to perform a large number of flexural strength determinations for acceptance testing. The present work has been laid around using a nondestructive test (a resonant column) to measure a seismic modulus that is used as a rating tool to evaluate the repeatability of duplicate specimens before the specimens are strength tested. This has been accomplished by developing regression lines and confidence and prediction intervals for the correlation of the seismic modulus to flexural, splitting tension, and compressive strength test. All these test show strong correlation coefficients and, thus, all have the possibility to be used in the prediction of flexural strength. The report suggests a new process for acceptance testing based on using a combination of compressive strength and seismic modulus. The selection of compression testing is based on the perceived know-how of the personnel of NCDOT throughout the State.
Author: Miguel Picornell-Darder Publisher: ISBN: Category : Nondestructive testing Languages : en Pages : 200
Book Description
The North Carolina Department of Transportation has used traditionally flexural strength tests for acceptance testing of Portland cement concrete pavements. This report summarizes a research project implemented to investigate the feasibility of using other strength tests and nondestructive tests, to accomplish the same objective of ensuring an adequate modulus of rupture of the slab but avoiding or reducing the need to perform a large number of flexural strength determinations for acceptance testing. The present work has been laid around using a nondestructive test (a resonant column) to measure a seismic modulus that is used as a rating tool to evaluate the repeatability of duplicate specimens before the specimens are strength tested. This has been accomplished by developing regression lines and confidence and prediction intervals for the correlation of the seismic modulus to flexural, splitting tension, and compressive strength test. All these test show strong correlation coefficients and, thus, all have the possibility to be used in the prediction of flexural strength. The report suggests a new process for acceptance testing based on using a combination of compressive strength and seismic modulus. The selection of compression testing is based on the perceived know-how of the personnel of NCDOT throughout the State.
Author: ACI Committee 522 Publisher: ISBN: 9780870313646 Category : Lightweight concrete Languages : en Pages : 38
Book Description
"This report provides technical information on pervious concrete's application, design methods, materials, properties, mixture proportioning, construction methods, testing, and inspection. The term 'pervious concrete' typically describes a near-zero-slump, open-graded material consisting of portland cement, coarse aggregate, little or no fine aggregate, admixtures, and water." [p. 1]
Author: Publisher: ISBN: Category : Concrete Languages : en Pages : 264
Book Description
This report represents nearly 6 years of collaboration among Federal Highway Administration (FHWA), State, and American Concrete Pavement Association (ACPA) engineers on the subject of Fastrack Concrete Paving. As an outgrowth of activities begun in 1986 in Storm Lake, Iowa, a Technical Working Group (TWG) assembled under the auspices of the FHWA's Special Project 201. Since the first meeting in Alexandria, Virginia, in 1988, the TWG has cooperated to construct pilot projects, test concrete material with the FHWA's mobile laboratory, sponsor workshops and conferences nationwide, simulate exercises on urban project designs, complete ACPA's Technical Bulletin on Fastrack, and support follow-on research. This report formally completes activities carried out under SP-201. It presents key information on opening-to-traffic criteria and pavement slab temperature management. It includes a summary of key projects built around the country in the last 6 years. It also includes a copy of ACPA's new bulletin and closes with reprints of several technical reports that may be of interest to the reader.
Author: Miguel Picornell-Darder
Author: Miguel Picornell-Darder
Author: Paul D. Tennis
Author: ACI Committee 522
Author: Thomas John Van Dam
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Author: C. H. Best
Author: American Concrete Institute