Post Date:5,Sep,2022

Mhedzisiro yemvura inodzikisa mumiririri pane shrinkage kupwanya kwekongiri yekutengesa:

A water reduction agent is an admixture inogona kuwedzerwa panguva yekongiri yekusanganisa nzira yekudzikisa zvakanyanya kana kuderedza zvakanyanya kongiri yekusanganisa mvura, kuvandudza fluidity yekongiri, uye kuwedzera simba rekongiri.Kudzidzira kwakaratidza kuti mushure mekuwedzera mvura inoderedza kune kongiri, kana pasina chikonzero chekuwedzera simba, huwandu hwesimende hunogona kuderedzwa zvakanyanya, uye compactness yekrete inogona kuvandudzwa.Naizvozvo, mvura yekudzikisa mumiririri chinhu chakakosha chekuwedzera mune yekutengeserana kongiri.

Kuti uwedzere kuvandudza mabhenefiti ehupfumi ekongiri yekutengesa, vagadziri vekongiri vanofarira kushandisa zvigadziriso zvemvura zvine mvura yakakwira yekudzikisa zvivakwa kuvandudza simba rekongiri kana kuderedza zvakanyanya kuwanda simende uye kuderedza mutengo wekugadzira.Kutaura zvazviri, uku kusanzwisisana kukuru.Kunyangwe kuderedzwa kwemvura kunobatsira kuvandudza simba rekumanikidza rekongiri, kuderedzwa kwemvura kwakanyanya kuchakanganisawo kusimba kwekongiri.Kunyangwe huwandu hwakakodzera hwekudzikisa mvura hunobatsira kuderedza shrinkage rate yekongiri, zvinofanirwa kucherechedzwa kuti pakugadzira kongiri inosanganiswa reshiyo, basa rekudzikisa mvura rekuwedzera mumiriri wekudzikisa mvura rakatorwa, uye mvura. -binder ratio inowanzogadzirirwa kuve yakaderera.Kushandiswa kwemvura kuchawedzera kuomeswa kwekongiri uye kuwedzera shrinkage rate yekongiri.

Kunyangwe simba rekumanikidza rekongiri yekutengesa risingadzike kana simende yemukati yadzikiswa zvakanyanya, simba rekusimba rinodzikira nekudzikira kwehuwandu hwematombo esimende akaomeswa mukongiri.Nekuda kwekuderedzwa kwehuwandu hwesimende, iyo kongiri simende slurry layer yakanyanya kutetepa, uye mamwe madiki madiki achaitika mukongiri.Ehe, iwo ma-micro-cracks ane mhedzisiro shoma pakusimba kwekongiri, asi pesvedzero pasimba rekusimba uye zvimwe zvinhu zvekongiri hazvigone kuderedzwa.Kudzikisira kwakanyanya kwezvinhu zvecementitious kuchakanganisawo elastic modulus uye kukambaira kwekongiri, zvichiita kuti kongiri iwedzere kuputika.

Kupfupisa, kana uchigadzira kongiri yekutengeserana, iyo kongiri yekudzikisa mvura mwero uye huwandu hwesimende zvinhu zvinofanirwa kutariswa zvizere, uye hapana muganhu kuderedzwa kwemvura kana kuderedzwa kwakanyanya kwezvinhu esimende kunobvumidzwa.