Download e-book for kindle: Mechanical, Thermal and Hygric Properties of Buildings by Eva Vejmelkova, Jan Zatloukal, Pavel Reiterman

By Eva Vejmelkova, Jan Zatloukal, Pavel Reiterman

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Extra info for Mechanical, Thermal and Hygric Properties of Buildings Materials

Sample text

The dynamic modulus of elasticity was determined from ultrasound velocity pulse method witch was measured by ultrasound according to CSN EN 12504-4 on cylinders with diameter of 100 mm and height of 200 mm. Free autogenous shrinkage. Free autogenous shrinkage was measured by device for continuous volume changes measurement of cementitious materials during their hardening [14]. This device provided information about ongoing changes during transition of material from the liquid phase to solid phase.

3) for calculation of total free shrinkage in time and for other further calculations (Fig. 4). This formula is applicable only for first 14 days for the HPC mixture. ε(t)CS = ε(t)AS + ε(t)DS = C1(t-t0)C2 + C3 √(t-td) (1) C1, C2 and C3 (Tab. 2) are material constants derived from free shrinkage measurements, t is age of concrete in days, t0 is initial setting time and td is age of concrete when drying was initiated. -1000 drying shrinkage ԑDS [µε] autogenous shrinkage εAS [µε] -1000 influence of temperature -800 -600 -400 HPC -800 -600 NSC -400 -200 -200 0 0 0 30 60 90 0 120 90 time [h] total shrinkage ԑTS [µε] Tab.

Because of high values of hygroscopic moisture content of zeolite concretes, exposing them to effects of weather conditions (see Tab. 1) may lead to liquid water appearance and freezing during a reference year which goes along with phase changes and volume expansion. This can finally cause mechanical damage of concrete and thus a subsequent decrease of service life of building envelope. Therefore, moisture and temperature fields across the envelope were simulated and critical moments were identified.

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