PaintSquare.com


The First Word in Protective & Marine Coatings

A Product of Technology Publishing / PaintSquare
JPCL | PaintSquare News | Durability + Design | Paint BidTracker


C42 Standard Test Method for Obtaining and Testing Drilled Cores and Sawed Beams of Concrete

All Standards | ASTM Standards
Search Standards


Click to Purchase and Download this Standard or Test Method

Revision Date: February 14, 2013
Updated On: June 04, 2013
Editorial Change:
 
3.1 This test method provides standardized procedures for obtaining and testing specimens to determine the compressive, splitting tensile, and flexural strength of in-place concrete. 3.2 Generally, test specimens are obtained when doubt exists about the in-place concrete quality due either to low strength test results during construction or signs of distress in the structure. Another use of this method is to provide strength information on older structures.

3.3 Concrete strength is affected by the location of the concrete in a structural element, with the concrete at the bottom tending to be stronger than the concrete at the top. Core strength is also affected by core orientation relative to the horizontal plane of the concrete as placed, with strength tending to be lower when measured parallel to the horizontal plane.3 These factors shall be considered in planning the locations for obtaining concrete samples and in comparing strength test results.

3.4 The strength of concrete measured by tests of cores is affected by the amount and distribution of moisture in the specimen at the time of test. There is no standard procedure to condition a specimen that will ensure that, at the time of test, it will be in the identical moisture condition as concrete in the structure. The moisture conditioning procedures in this test method are intended to provide reproducible moisture conditions that minimize within-laboratory and between-laboratory variations and to reduce the effects of moisture introduced during specimen preparation.

3.5 The measured compressive strength of a core will generally be less than that of a corresponding properly molded and cured standard cylinder tested at the same age. For a given concrete, however, there is no unique relationship between the strengths of these two types of specimens (see Note 3). The relationship is affected by many factors such as the strength level of the concrete, the in-place temperature and moisture histories, the degree of consolidation, batch-to-batch variability, the strength-gain characteristics of the concrete, the condition of the coring apparatus, and the care used in removing cores. Note 3—A procedure is available for estimating the equivalent cylinder strength from a measured core strength.4 Note 4—In the absence of core strength requirements of an applicable building code or of other contractual or legal documents that may govern the project, the specifier of tests should establish in the project specifications the acceptance criteria for core strengths. An example of acceptance criteria for core strength is provided in ACI 318,5 which are used to evaluate cores taken to investigate low strength test results of standard-cured cylinder during construction. According to ACI 318, the concrete represented by the cores is considered structurally adequate if the average strength of three cores is at least 85?% of the specified strength and no single core strength is less than 75?% of the specified strength.

3.6 The “specifier of the tests” referenced in this test method is the individual responsible for analysis or review and acceptance of core test results. Note 5—For investigation of low strength test results, ACI 318 defines the specifier of the tests as the licensed design professional.

3.7 The apparent compressive strength of concrete as measured by a core is affected by the length-diameter ratio (L/D) of the core as tested and this must be considered in preparing core specimens and evaluating test results.

(Back to all Standards)

 
   

HoldTight Solutions Inc.
NO FLASH RUST -
NO CONTAMINANTS

Our HoldTight®102 salt remover & flash rush inhibitor prevents flash rust by removing surface contaminants.
Contact us for your nearest distributor. (800) 319.8802 sales@holdtight.com


Thermion Inc
Buy Back Program

We are offering $5,000
credit for your old Model
This drive system is
being discontinued by
the manufacturer.
More information at
thermioninc.com
877.884.3428


CS Unitec
Peening Preparation Tools

CS Unitec’s hand-held scarifiers are an ideal alternative to small-area shot blasting for cleaning and preparing concrete & metal surfaces. info@csunitec.com


Sherwin-Williams
Nova-Plate® 325

• Extends Service Life
• Single Coat Application
• Cure to Service in 24 Hours


PaintSquare
SSPC 2014 Product Demos

Watch product demos by SSPC 2014 exhibitors. Check them out now!


Sauereisen, Inc.
Experts in Corrosion

A Leader in the manufacture of speciality cements and corrosion-resistant materials of construction. www.sauereisen.com


Safway Services
One Source. Every Solution.

The Safway Group is your source for multiservices. Painting, coating, insulation and more – all from the most trusted name in the industry.

 
 
 
Technology Publishing

The Technology Publishing Network

The Journal of Protective Coatings & Linings (JPCL) PaintSquare
Durability + Design Paint BidTracker JPCL Europe

 
EXPLORE:      JPCL   |   PaintSquare News   |   Interact   |   Buying Guides   |   Webinars   |   Resources   |   Classifieds
REGISTER AND SUBSCRIBE:      Free PaintSquare Registration   |   Subscribe to JPCL   |   Subscribe to PaintSquare News
MORE:      About PaintSquare.com   |   Privacy policy   |   Terms & conditions   |   Site Map   |   Search   |   Contact Us
 

© Copyright 2000-2014, Technology Publishing / PaintSquare, All rights reserved
2100 Wharton Street, Suite 310, Pittsburgh PA 15203-1951; Tel 1-412-431-8300; Fax 1-412-431-5428; E-mail webmaster@paintsquare.com