Zuva Rokutumira:14,Mar,2022

Musanganiswa unotsanangurwa sechinhu chisiri chemvura, akaunganidzwa, hydraulic cementitious zvinhu kana fiber reinforcement iyo inoshandiswa sechinhu chemusanganiswa wecementitious kugadzirisa iyo ichangobva kusanganiswa, kuseta kana kuomeswa zvivakwa uye iyo inowedzerwa kune batch pamberi kana panguva yekusanganiswa. . Sezvakataurwa muChikamu 1, makemikari admixture anowanzotsanangurwa zvakare seasiripozzolanic (haadi kuti calcium hydroxide iite) musanganiswa muchimiro chemvura, kumiswa kana kunyungudika kwemvura.

Mvura-inoderedza misanganiswa inovandudza kongiri yepurasitiki (yakanyorova) uye yakaomeswa zvivakwa, nepo seti-inodzora admixtures inoshandiswa mukongiri inoiswa uye inopedzwa mune imwe kunze kwekudziya kwakanyanya. Ose ari maviri, kana akashandiswa zvakakodzera, anobatsira kutsika dzakanaka dzekugadzira. Zvakare, zvese zvakasanganiswa zvinofanirwa kusangana nezvinodiwa zveASTM C 494 (ona Tafura 1).

Mvura-Kuderedza Admixtures

Vanoderedza mvura vanoita chaizvo izvo: kuderedza huwandu hwemvura inosanganiswa inodiwa kuti uwane kudonha kwakapihwa. Izvi zvinogona kuguma nekuderedzwa kwemvura-cementitious ratio (w / c ratio), iyo inotungamirira kuwedzera kusimba uye kuwedzera kwekrete yakasimba.

Kuderedza w / c chiyero chekongiri chakaonekwa sechinhu chakakosha pakugadzira yakasimba, yemhando yepamusoro kongiri. Kune rimwe divi, dzimwe nguva simende yemukati inogona kudzikiswa uchichengetedza iyo yekutanga w / c reshiyo kuderedza mutengo kana kupisa kwemvura yekongiri inodururwa.

Mvura-inoderedza misanganiswa inoderedzawo kupatsanurwa uye inovandudza kuyerera kwekongiri. Naizvozvo, ivo vanowanzoshandiswa kune kongiri yekupomba maapplication zvakare.

Mvura inoderedza misanganiswa inowanzowira mumapoka matatu: yakaderera-, yepakati- uye yakakwirira-renji. Aya mapoka akavakirwa pahuwandu hwekudzikisa mvura kune admixture. Chikamu chekudzikisa mvura chinoenderana nemvura yekutanga yakasanganiswa inodiwa kuti uwane kudonha kwakapihwa (ona Tafura 2).

Nepo zvese zvinoderedza mvura zvine zvakafanana, imwe neimwe ine yakakodzera application iyo yakanyatsokodzera. Tafura 3 inopa pfupiso yemhando nhatu dzekudzikisa-kudzikisa mvura, huwandu hwadzo hwekudzikisa mvura uye kushandiswa kwavo kwekutanga. Mhedzisiro yavo pakupinda kwemhepo inosiyana zvichienderana nemakemikari.

Mashandiro avanoita

Kana simende yasangana nemvura, machaji emagetsi akasiyana-siyana ari pamusoro pemasimende anokwezvana, izvo zvinoguma nekutsikitsira kana kuungana kwezvikamu. Chikamu chakanaka chemvura chinoputirwa muchiitiko ichi, zvichiita kuti zvive nekubatana kwakabatana uye kuderedza kuderera.

Misanganiswa inoderedza mvura inokonzeresa machaji epasi pane zvimedu zvakasimba uye zvinoita kuti nzvimbo dzese dzitakurwe semachaji. Sezvo zvimedu zvine machaji akafanana zvichidzinga mumwe nemumwe, zvinoderedza kuyerera kwemasimende uye inobvumira kupararira kuri nani. Vanoderedzawo viscosity yepaste, zvichiita kuti pave nekuderera kukuru.

Tafura 4 inopa zvimwe zvezvinhu zvinonyanya kushandiswa kune yega yega yemhando yekudzikisa mvura. Zvimwe zvikamu zvinowedzerwawo zvichienderana nechigadzirwa uye mugadziri. Mimwe misanganiswa inoderedza mvura ine mhedzisiro kana inosanganiswa neretarders kana accelerators.