On-Demand Course: Testing Concrete Strength Using 4 x 8 Cylinders

Price: $ 39.00 USD

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INSTRUCTIONS: Read and study the materials included in this module. Then, complete and pass the corresponding 10-question quiz with a score of 80% or higher to receive a certificate for 0.1 CEU (equivalent to 1.0 PDH). This online course is not approved for credit with the Florida Construction Industry Licensing Board (CILB).

Continuing Education Credit: 0.1 CEU (1 PDH)

Access Period: 30 days


This course presents the research and experience on the relationship between concrete strength assessments based on 6 x 12 and 4 x 8 in. test cylinders. The presentations describe the advantages and disadvantages of each cylinder type, and the differences and the significance of the differences between strength assessments of each type of cylinder type. Also discussed is microwave oven testing that is used to determine water-cement ratio and ensure durability requirements.


Document Details

Publication Year: 2015


Formats: Online Learning

Table of Contents

Learning Objectives:

1. Identify the variations and differences in strength measurements of the “same” concrete using “different” standard size test specimens;

2. Explain the pros and cons of each of the standard test sizes, and whether the physical size of the test specimen or the number of samples constituting a test create significant differences between them for the assessment of the 28-day compressive strength;

3. Relate 28-day compression strength testing and the variability to quality assurance of concrete so that attendees can answer for themselves whether size matters; and

4. Consider factors other than specimen size, such as quality testing and water content controls that, perhaps more significantly, affect the production of quality concrete


Any applicable errata are included with individual documents at the time of purchase. Errata are not included for collections or sets of documents such as the ACI Collection. For a listing of and access to all product errata, visit the Errata page.

Return/Exchange Policy

Printed / Hard Copy Products: The full and complete returned product will be accepted if returned within 60 days of receipt and in salable condition. A 20% service charge applies. Return shipping fees are the customer’s responsibility.

Electronic /Downloaded Products & Online Learning Courses: These items are not eligible for return.

Subscriptions These items are not eligible for return.

Exchanges: Contact ACI’s Customer Services Department for options (+1.248.848.3800 – ACICustomerService@concrete.org).