source: 公益社団法人 日本コンクリート工学会

a mixture:

｟かたく｠ ; C «…の» 混合物(mixture) «of» , 付加物; U混合.

e.g. he felt that his work was an admixture of aggression and creativity.

something mixed with something else, typically as a minor ingredient:

e.g. green with an admixture of black.

the action of adding an ingredient to something else.

early 17th century (in the sense ‘act of admixing’): from ad- (expressing addition) + mixture.