Time of Setting of Concrete Mixtures by Penetration Resistance. Standard Test Method for Time of Setting of Concrete Mixtures by Penetration Resistance. The resistance of the concrete mixture to penetration by standard. Extracted, with permission, from ASTM C / CM Standard Test Method for A copy of the standard may be purchased from ASTM International, phone.
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The resistance of the concrete mixture to penetration by standard. If times of set need to be c03, accelerators, heated materials or reduced slag cement content may be used Figure 2. Slower times of set are beneficial in hot weather because the contractor has a c4003 time to deliver, place, and finish the concrete.
Initial aztm final set times are important because they give an indication of when the concrete can be properly placed, consolidated and finished. ASTM C identifies initial and final time of set as:.
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Follow us on Twitter. This test qstm may also be used to determine compliance with specified time-of-setting requirements. However, when the setting time of concrete is desired, the test shall be performed on mortar sieved from the concrete mixture and not on a prepared mortar intended to simulate the mortar fraction of the concrete; it has been shown that the initial and final setting times may be increased when using the prepared mortar.
Why is Asmt of Set Significant? Cementitious material chemistry Cementitious material fineness Cementitious material content Water to cementitious materials ratio Concrete and ambient temperatures Admixture types Fly ash and pozzolan properties How Does Slag Cement Affect Time of Set?
When water comes into contact with hydraulic cement, a chemical reaction called hydration occurs. Enter your asym email address to request a password reset: Please sign into an account with a subscription aetm this content, or email for help at support madcad.
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In this test method, the times required for the mortar to reach specified values of resistance to penetration are used to define times of setting. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other.
Among other things, the initial and final time of set are influenced by: Combining values from the two systems may result in non-conformance with asm standard. This reaction combines water with cement forming chemical compounds, increasing the strength of the material and changing it from a plastic, moldable material to a solid capable of withstanding substantial loads.
ASTM C – National Precast Concrete Association
Time of set is defined as the point in time at which penetration resistance reaches specified values. Join us on Facebook. There were no books found for the applied search filters. The percentage of slag cement used can also affect times of set.
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The electronic file may not be reproduced in any way. Are you sure you want to empty the cart? At temperatures less than 85 degrees Fahrenheit, concrete containing slag cement can have longer times of set, when compared with percent portland cement concrete.
Typically to a concrete contractor, initial time of set refers to the time at which a concrete surface c40 bear qstm weight of an individual with minimal indentation.
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Sign up for our newsletter. In addition the electronic files may not be downloaded or distributed elsewhere over computer networks or otherwise. Penetration resistance Initial Time of Set psi Final Time of Set psi Typically to a concrete contractor, initial time of set refers to the time at which a concrete surface can bear the weight of an individual with minimal indentation.
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wstm Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Historical Version s — view previous versions of standard. ASTM C identifies initial and final time of set as: If you like to setup a quick demo, let us know at support madcad.
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However, replacement rates of less than 30 percent generally will not affect times of set significantly. Medias this blog was made to help people to easily download or read PDF files.