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Home > Publications > International Concrete Abstracts Portal
Showing 1-5 of 31 Abstracts search results
Document:
CI4611Bartlett
Date:
November 1, 2024
Author(s):
F. Michael Bartlett
Publication:
Concrete International
Volume:
46
Issue:
11
Abstract:
ACI PRC-214.4-21 and ACI CODE-562-21 provide methods for converting concrete core strength test results into equivalent specified concrete strengths. The research discussed in this paper investigates the applicability of these methods as well as their limitations.
CI3807Bartlett
July 1, 2016
38
7
This article is the sixth of a series of articles intended to explain the rationale behind some of the upcoming changes in the ACI 562 Code. It discusses the ACI 562 provisions, derived from the method presented in Section 9.4.2 of ACI 214.4R-10, for calculating in-place concrete compressive strength from core test results. It also provides example calculations using the procedures included in both documents.
CI3502Q&A
February 1, 2013
35
2
The 28-day cylinder breaks were initially fine, but now they’re coming in low. The concrete supplier blames the testing lab and the testing lab blames the supplier. Who can we believe? Can ACI 214R be used to sort this out?
SP284-5
March 1, 2012
Symposium Papers
284
Section 20.2 of ACI 318-08 gives provisions for determining required dimensions and material properties for the strength evaluation of an existing concrete structure. Subsection 20.2.3 states “If required, concrete strength shall be based on results of cylinder tests from the original construction or tests of cores removed from the part of the structure where the strength is in question. For strength evaluation of an existing structure, cylinder or core test data shall be used to estimate an equivalent fc’.” The commentary cites two methods presented in ACI 214.4R for determining an equivalent-to-specified fc’ using cores from an existing structure. There are no criteria provided or references cited, however, suggesting how to compute an equivalent fc’ based on cylinder strength data. The paper first identifies necessary conditions for using original cylinder test data to determine a concrete compressive strength for structural evaluation. To investigate strength compliance during initial construction, methods to compute an equivalent-to-specified fc’ value are presented that are based on inverting the conventional acceptance criteria given in ACI 318-08 Section 5.6.3.3. To evaluate an older structure, a method to determine an equivalent-to-specified strength based on the lower-bound fractile of the concrete strength represented by fc’ is presented.
DOI:
10.14359/51683800
SP214-08
June 17, 2003
A. O. Kaeding
214
A cast in place reinforced concrete building built in 1913 was repaired in 1975 using polymer impregnation, epoxy crack injection and epoxy grouting. The project is an example of using polymer impregnation to restore severely deteriorated, under-strength concrete. Original plans were to extend the useful life of the building by 15 years. This paper briefly reports that the building has been in service for 28 years since the restoration and is being replaced this year because it is no longer large enough. The building remains serviceable and there has been discussions of historic preservation after the new facility is completed.
10.14359/12763
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The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
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