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...Cement and concrete research vol pp printed in the usa copyright c pergamon press plc reaction mechanisms of admixtures p paulini institut f ir baustofflehre und materialpri ifung universit it lnnsbruck a innsbruck austria communicated by w there is still no full understanding hydration including all these phenomena at once this contribution emphasis shall be put energy transformations occuring during physico chemical processes volume change t i evolves way which includes two phase transitions reaching state supersaturation pore water solution crystallization into stable solid csh products can follow both sudden occurs resulting from changes bound forces figure l shows phenomenon plot according to van der waals theory area m u iiitlransition transition ace v j tati fluid solvationprocess leads an increase swelling involves contraction shrinkage higher absolute terms than previous remains after measured volumetrically or gravimetrically interact simultaneously but with different veloci ...