Frequently Asked Questions on Concrete Materials - NRMCA

Industry standards, such as ACI 318, ACI 301, and ASTM C94 state that samples for acceptance testing of concrete should be obtained in accordance with Practice ASTM C172. The intent is to obtain representative samples of fresh concrete delivered to a project. Tests performed on this sample determine if concrete complies with the quality requirements of project specifications. ASTM C172 describes sampling from stationary (plant), paving, and truck mixers, and from agitating and non-agitating equipment transporting central-mixed concrete. Sampling from volumetric batching and continuous mixing equipment is also covered. ASTM C172 does not include procedures for obtaining samples from placement equipment, such as concrete pumps, conveyor belts, or crane and bucket placement.

You can find more information on our web, so please take a look.

Stationary Mixers (tilting and non-tilting) – obtain two or more portions at regularly spaced intervals during discharge of middle portion of the load. Do not sample from the first and last portions of discharge. Obtain samples from the entire discharge stream with care not to restrict the flow of concrete.

Sino contains other products and information you need, so please check it out.

Paving – Obtain samples from at least 5 portions from a discharged pile. Avoid contamination from the subgrade.

Revolving Drum Truck Mixers or Agitators – Sample after all adjustments are made and mixed in the batch. Obtain two or more portions at regularly spaced intervals during discharge of the middle portion of the load. Do not sample from the first and last portions of discharge. Divert the complete discharge stream into the sample container. Regulate the rate of discharge when collecting sample.

Are you interested in learning more about concrete mold manufacturers? Contact us today to secure an expert consultation!