In-place Methods to Estimate Concrete Strength
Author: ACI Committee 228--Nondestructive Testing of Concrete
Publisher:
Published: 1995
Total Pages: 41
ISBN-13: 9780870314957
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Author: ACI Committee 228--Nondestructive Testing of Concrete
Publisher:
Published: 1995
Total Pages: 41
ISBN-13: 9780870314957
DOWNLOAD EBOOKAuthor: Zhengqi Li
Publisher:
Published: 2020
Total Pages: 15
ISBN-13:
DOWNLOAD EBOOKIt was proposed that a 16-story steel framing structure be built on top of an existing 12-year-old 1-story reinforced-concrete structure. The in-place concrete compressive strength of 3 footings and 29 plinths was estimated using a postinstalled pullout test and a core compressive strength test. The influence of different length-to-diameter ratios of the cores and different diameters of cores and the correlation between maximum pullout force and core compressive strength were investigated. The results of the pullout test and core strength test indicate that the concrete compressive strength of footings and plinths was considered structurally adequate as per the acceptance criteria for tested core strength and estimated core strength given by ACI 318, Building Code Requirements for Structural Concrete and Commentary , and ACI 228.1R, In-Place Methods to Estimate Concrete Strength , respectively. Maximum pullout force had a strong correlation with the core compressive strength. The influence of the different length-to-diameter ratio of cores on the strength correlation was not significant if the raw results of the compressive strength tests were corrected by multiplying the corresponding correction factors for the length-to-diameter ratio given by ASTM C42, Standard Test Method for Obtaining and Testing Drilled Cores and Sawed Beams of Concrete . The mixed use of the test results of 3.20 and 3.74-in. (81-mm and 95-mm) cores resulted in a decrease in the R 2 of the correlation model, compared to that of the correlation model based on 3.74-in. (95-mm) cores. This was attributed to the potentially increased testing error as the diameter of the cores decreased. Recommendations for successfully performing postinstalled pullout tests in the field were proposed. With the use of pullout tests, the project team was able to determine that the existing structural members had sufficient capacity. A delay in the project schedule was avoided.
Author: Jeffrey McMillan Nixon
Publisher:
Published: 2006
Total Pages: 713
ISBN-13:
DOWNLOAD EBOOKAuthor: Samuel Allen Wade
Publisher:
Published: 2005
Total Pages: 366
ISBN-13:
DOWNLOAD EBOOKAuthor: Jeffrey McMillan Nixon
Publisher:
Published: 2006
Total Pages: 713
ISBN-13:
DOWNLOAD EBOOKAuthor: A. Michel Alexander
Publisher:
Published: 1998
Total Pages: 52
ISBN-13:
DOWNLOAD EBOOKAuthor: Matthew R. Johnson
Publisher:
Published: 1993
Total Pages: 194
ISBN-13:
DOWNLOAD EBOOKAuthor: American Concrete Institute
Publisher: American Concrete Institute
Published: 2005
Total Pages: 660
ISBN-13: 0870311948
DOWNLOAD EBOOKAuthor: Edward G. Nawy
Publisher: CRC Press
Published: 2008-06-24
Total Pages: 2177
ISBN-13: 1040062830
DOWNLOAD EBOOKThe Concrete Construction Engineering Handbook, Second Edition provides in depth coverage of concrete construction engineering and technology. It features state-of-the-art discussions on what design engineers and constructors need to know about concrete, focusing on - The latest advances in engineered concrete materials Reinforced concrete construction Specialized construction techniques Design recommendations for high performance With the newly revised edition of this essential handbook, designers, constructors, educators, and field personnel will learn how to produce the best and most durably engineered constructed facilities.
Author: V. M. Malhotra
Publisher: CRC Press
Published: 2004
Total Pages: 389
ISBN-13: 0803120990
DOWNLOAD EBOOKCivil engineers will value this resource that examines the tools and techniques used to estimate the in-place strength on concrete, permeation properties that relate to potential durability, and the methods used to assess the internal condition of concrete and the corrosion activity of steel reinforcement.