Tài liệu Tiêu chuẩn thử nhổ bu lông ASTM C900-Standard Test Method for Pullout Strength of Hardened Concrete

Summary of Test Method
A metal insert is either cast into fresh concrete or installed into hardened concrete. When an estimate of the in-place strength is desired, the insert is pulled by means of a jack reacting against a bearing ring. The pullout strength is determined by measuring the maximum force required to pull the insert from the concrete mass. Alternatively, the insert is loaded to a specified load to verify whether a minimum level of
in-place strength has been attained.