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Extra info for Frost and Scaling Resistance of High-Strength Concrete
5), which corresponds to moderate to severe scaling. Such a level of deterioration is, of course, not satisfactory for most applications. 25. This conclusion agrees with findings from other researchers (Li et al. 1994, Gagné et al. 1992). 1 ACI Requirements The second line of Table 4-4. 5 mm. 5 MPa (5000 psi). 2). For the same standard deviation, mixture 50-6 would meet a specification requirement for only about 29 MPa. 5 MPa. ACI 318-99 includes minimum durability requirements for freezing and thawing exposures based on the watercementitious ratio, compressive strength, and total air content.
9 L of superplasticizer, and 63 mL of AEA per cubic meter in the amount of materials for mixture 45-N to arrive at mix- ture 30-6A. 7% of cement weight and 733% of superplasticizer, plus inclusion of the necessary air-entraining admixture. Compressive strength can also be interpreted as a function of the total porosity, or void content, in hardened concrete. 35 is almost a linear function of the socalled “cement-voids ratio,” calculated by MINNDOT for a given volume of concrete as the volume of cement divided by the sum of the volumes of air and water.
14. According to ASTM C 1202, values of cumulative charge less than 2,000 coulombs are indicative of a specimen with low chloride ion penetrability. 35 would be necessary to achieve such a low chloride ion penetrability. 4, only specimens 50-N, 45-N, 40N and suffered a decrease of the transverse fundamental frequency, and thus their relative dynamic moduli Ed after 300 cycles or fewer were significantly smaller than 100%. The relative Ed is calculated as the squared ratio of the fundamental transverse frequency at the beginning of the test to the fundamental transverse frequency at the end of the test.