Contents

Overview

The strength requirement for site-cured specimens is different from the traditional strength requirements for concrete whereby the specimens must reach a certain strength by a certain age for mix design purposes. Instead, the site cured specimens are used to determine when the concrete on-site has reached a certain strength threshold that will allow formwork to be removed from around the concrete. The age at which site cured specimens will be first tested for this strength is usually decided during a pre-pour meeting that includes input from the contractor, testing consultant, design engineer and sometimes the owner and is based on many factors that are local both in location and time.

Site-cured specimens are, therefore, tested at this initial age and often at consecutive days until the concrete is found to meet the desired strength, though site cured specimens can be tested within hours of casting too. The required strength for site cured specimens, therefore, requires only the one input.

Specimen Types

The site cured required strength functionality only applies to the following specimen types:

Site Cured Specimen Required Strength

QESTLab Bulk Entry Screen

On the Bulk Entry screen for the Concrete US Sample, an input for Site Cured Required Strength is located beneath the Test Group drop down. This field is disabled if no specimens exist on the sample and is only re-enabled if one or more specimens with the correct type exist on the sample. 

QESTLab Sample Screen

On the QESTLab US Concrete Sample screen an input for Site Cured Required Strength, labelled as 'Site Cure Str. [units]' is located on the Mix Data tab. This field applies to site cured specimens only and defines the required strength for all site cured specimens regardless of age.

If no specimens exist in the specimen grid that have one of these types, then the required strength field is disabled.

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