After enduring 300 freezing-thawing cycles, the relative dynamic modulus of elasticity
of UHPCs normally did not decrease, and the mass losses were less than 0.5% [18, 19].
Results of the dynamic modulus of elasticity
are shown in Table 3.
Ultrasonic pulse velocity, dynamic modulus of elasticity
, compressive strength and fluorescence test methods were applied for structure analysis of UHPC after cyclic salt-scaling.
Concrete prisms with size of 100 mm x 100 mm x 400 mm (to determine the weight loss and the dynamic modulus of elasticity
) were prepared.
Weight Loss and Dynamic Modulus of Elasticity
. The relative weight loss and the relative dynamic modulus of elasticity
([E.sub.d]) of RCC with F-T cycles in water and KAc solution are shown in Figure 3.
Impact of Temperature on the Dynamic Modulus of Elasticity
. The dynamic modulus is one of the main contents of frozen soil research .
The results of ultrasonic impulse velocity, dynamic modulus of elasticity
and compressive strength tests are presented in Table 4.
The freeze-thaw resistance was measured by using the test method for rapid freezing and thawing in water, and the main test apparatuses were the rapid freeze-thaw test machine, the tester of the dynamic modulus of elasticity
, the hydraulic universal test machine, and the balance.
Concrete specimens were fabricated in a cylindrical ([empty set] 100 mm x 200 mm) and cuboidal (100 x 100 x 400 mm) mould for chloride migration test and relative dynamic modulus of elasticity
After reaching a predefined number of freeze-thaw cycles, concrete specimens were taken out of the testing set-up, and relative dynamic modulus of elasticity
was determined, which aims to evaluate the frost damage of concrete after different freeze-thaw cycles.
where [E.sub.fr] dynamic modulus of elasticity
of log based on resonance vibration, p green density of log, l = length of log, and f = fundamental resonance frequency of log.
Both mass loss and loss of dynamic modulus of elasticity
were checked for the standard samples.