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By S. D. Myers

Publication through S. D. Myers, J. J. Kelly, R. H. Parrish

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Due to the substandard fiber dispersion of M-4 in the drum mixer, a slump test was not carried out. 42 and initially mixed at small volume in the planetary mixer. 1YOin M-4. Mix M-5 was then mixed in the laboratory drum mixer and all requirements with respect to workability were met. The particle and fiber dispersion were excellent due to a suitable consistency of the mortar. 30). 3%. 260), a significantly higher flowability can be achieved. A demonstration of the applicability of this concept in general and mix M-5 in particular was successfully carried out using a conventional 250 liter drum mixer on a construction site.

6nm occurs when RH < 50%. ) This means that according to Kelvin’s equation all pores with a radius of lnm are empty at 40% RH. The opposite surfaces of CSH-gel particles can coalesce when the relative humidity reaches 40% due to the Drying shrinkage and crack width of an Engineered Ceinentitious Composites (ECC) 39 additional attractive van der Waals force which acts between the surfaces. At 40% RH, only adsorbed water on the surfaces of the particles is left. The attractive capillary under-pressure and van der Waals force are no longer responsible for drying shrinkage of RH<40%.

After all specimens had reached hygral equilibrium the specimens stored at 0% RH were dried in an oven at 105C until the mass is constant. After removing from the oven the specimens were allowed to cool down to room temperature in order to measure the hygral length change due to moisture loss. When the specimens reached thermal equilibrium with room temperature the length change and mass loss were determined and considered as values at RH = 0%. In order to investigate the number and width of cracks, the restrained shrinkage ring test [181 was adopted (Fig, 2b).

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