AASHTO TP 135-20 PDF Download

AASHTO TP 135-20 outlines a standard procedure for measuring the total pore volume in hardened concrete samples. The method involves vacuum saturation, wherein a vacuum is applied to the concrete sample to remove any air present in the pores. This is followed by saturation with a suitable liquid, typically water, to fill the void spaces within the concrete.

The purpose of this standard is to determine the total pore volume in hardened concrete, which is an important parameter in assessing the durability and quality of the material. By measuring the total pore volume, engineers and researchers can gain insights into the porosity of the concrete, which can affect its resistance to various environmental factors such as freeze-thaw cycles, chemical attacks, and moisture ingress.

The standard provides detailed instructions on the equipment and apparatus required for performing the test, including a vacuum chamber, sample holder, and means of applying and measuring vacuum levels. It also specifies the sample preparation procedures, such as cutting and drying the concrete specimens, as well as the saturation process using vacuum and liquid immersion.