02
Aug
Concrete Water Absorption Rate. The exterior surface is often subjected to less than intended curing and is exposed to the most potentially adverse conditions. This type of test is a useful measure of the durability of concrete and typical values of sorptivity are 009 mmmin05 for concrete with watercement ratio of 04 and 017 mmmin05 at a watercement ratio of 06 Neville1996. The thickness of the affected zone was more than 40 mm after 4 years exposure but the major differences were observed in the 20 mm surface zone. Water leaves the largest accessible pores first.
In addition surface relative humidity was found as an accurate and practical indicator of concrete moisture content. Specifically to chloride and sulphate ions. CIRIA Report C559 says that air entrainment may not provide freeze-thaw resistance if the aggregates are not of suitable quality. The presence of air voids in concrete modifies the mechanism. For example lightweight aggregate concrete is often made with aggregates of higher. These relationships were verified by additional exposed and in-situ measurements.
In aerated concrete is important when considering performance.
This test method is used to measure the water absorption rate of both the concrete surface and interior concrete. The water absorption by immersion. Initial and secondary 24-168 h rates of water absorption is observed while increasing the air voids content in concrete 2. The average water absorption rate. Water absorption rate was very sensitive to the moisture content of the concrete particularly at relative humidities above 60 which were common for field exposure. This test method is used to measure the water absorption rate of both the concrete surface and interior concrete.