Karafa ita ce kayan gini mai haɗewa wanda aka yi shi daga simintin Portland, ƙarfe mai ƙarfi (sands), ƙarfe mai ƙarfi (gravel ko crushed stone), da ruwa wanda ya jagƙan ta tsarin sinadarai na hydration. A cikin gina shingen shinge da injiniyarin geotechnical, karafa tana aiki a matsayin muhimmin hanyar gina ginin don kaiwa lodi daga saman gini ta hanyar ƙasa mara ƙarfi ko ƙasa mai ƙarfi zuwa sassan da suka dace. Ƙarfin nata, ɗorewa, da aikin nata na sa hana ayyukan gini da buƙatun ƙarfi da ɗorewa a cikin yanayin ƙasa mara ƙarfi.
Karafa mai saukar da aka yi ta wata kayan haɗin gida wanda aka haɗa shi daga siminti, ƙarfe (sands da gravel), ruwa, da abubuwan da aka ƙara wanda aka yi a wata masana'antar haɗa kayan gida kuma aka kai shi zuwa gaɓar aikin gini a matsayin abin hawa. Kayan gida wata na haɗa da ingancin masana'anta tare da ƙarfin aikin gida, wanda ya sa ya zama ma'aunin masana'anta don aikin gini na shingen shinge da geotechnical inda ake buƙatar ƙarfi, aikin gida, da aiki don ɓangaren gini da matakai.
Wannan concrete mai mahimmanci shine kayan da aka tsara da kyau wanda aka yi don sanya a cikin yanayin nutsewa ko karkashin ruwa, inda hanyoyin sanya concrete na al'ada za su zama mara aiki saboda ruwan ya shiga cikin ruwa ko rarraba. Wanda aka yi daga Portland cement, ƙarfe mai ɗanɗano da ƙarfe mai ɗanɗano, da ruwa, tremie concrete ya ƙunshi ɗan ƙara yawan adobe da raguwar yawan ruwa-cement idan aka kwatanta da concrete na gini na al'ada. Tsarin kayan ya kasance an tsara shi musamman don hana ruwa ya share particles na cement a lokacin sanya, wanda yake riƙe ƙarfin haɗin kai da haɓakawa har ma a cikin muhallin karkashin ƙasa mai ƙalubale.
Concrete mai haɗin kai zuwa kai shine concrete mai ɗanɗano, mara rarraba wanda aka tsara don zuwa kai da haɗaka ƙarƙashin nauyinsa ba tare da juyin juyin ba. Wanda aka yi daga tsarin maɗaukin ƙarfe mai ƙarfi (Portland cement da kayan cementitious na biyu), ƙarfe mai ɗanɗano da aka tsara don haɗaka, da madannin ruwa mai ƙarfi (superplasticizers), SCC yake haɗin kai da ƙarfin haɗin kai da ƙarfin ƙarfe. Mixture ɗin ya ƙunshi ɗan ƙara yawan adobe da ƙara yawan adobe da aka ƙayyade don soke buƙatar haɗin kai na waje yayin da yake riƙe ƙarfin gini da ƙarfin dogon lokaci a cikin muhallin karkashin ƙasa da kasan foundation mai ƙalubale.
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