Zuva Rokutumira:31,Oct,2022
Concrete admixturesyakashandiswa mukongiri kwemakore anoda kusvika zana sechigadzirwa. Asi kubvira kare kare, vanhu vagara vachiziva kushandiswa kwezvimwe zvokuwedzera mukugadzira simende. Iyo yakasimbiswa data inorekodha kuti muna 1885 veEurope vagara vatoziva kuti kuomeswa kwemirau, senge lime uye gypsum, yakawedzerwa kune kongiri. Pakupera kwezana ramakore rechi 19, kushandiswa kwecalcium chloride kwaive kushatirwa kwese uye kuchiri kushandiswa nhasi. Pakazosvika 1895, mvura inotambanudza uye mapurasitiki akanga awedzerwa kune kongiri yekugadzira migwagwa, iyo yakagadzirisa zvakasimba kusimba kwekongiri.
Zvigadzirwa zvemumaindasitiri zvakatanga kuonekwa muna 1910. Apo North America yakagadziridzwa muUnited States muma1930, nzira yekongiri yakakurumidza kuoma nechando nekuda kwekutonhora kwakanyanya. Kuti uvandudze kunaka kwekongiri yakarongwa, "vinsa resin" yakashandiswa kuvandudza kusimba kwekongiri. sex. Iyo chaiyo yesainzi yekutsvagisa chigadzirwa ndeye "Pozzolitn" yekudzikisa mvura mumiririri (Pozzolitn), iyo yakabudirira kuongororwa uye kugadzirwa neEW Scxiptrt yeMasterBuilder yekuUnited States muna 1935, iyo inonyanya kuumbwa ne lignosulfonate mu pulp tsvina yemvura. Muna 1937, United States yakapa patent yekutanga yekudzikisa mvura munhoroondo. Muna 1954, yekutanga batch yekuyedza zviyero zvekongiri admixturesyakagadzirwa.
Iko kushandiswa kwepamutemo kwekongiri admixturesmunyika yangu maiva kuma1950. Panguva iyoyo, rosin saponified air-entraining agent yakagadzirwa nenyanzvi kubva kune yaimbova Soviet Union yakaunzwa. Yakaiswa muTianjin Tanggu New Port, Wuhan Yangtze River Bridge neFoziling Reservoir, uye yakawana mimwe mibairo. Gare gare, mapurasitiki ekongiri anoshandisa pulp tsvina yemvura kubva sulfite papermaking uye tsvina yehuchi kubva kuindasitiri yeshuga seyakashandiswa. Kushandiswa kwezvakasanganiswa zvakatangawo kubva ipapo.
Kuvandudzwa uye kushandiswa kwekongiri admixturesine kukosha kwenguva refu. Nesimba kukura nekusimudzira mashandisirwo ekongiri admixturesinzira yakakosha yekusimudzira kufambira mberi kwesainzi kweindasitiri yekuvaka.
Mukuita kwekuvaka kwemapurojekiti ekuvaka, kushandiswa kwezvakasanganiswa kunogona kunyatso kuvandudza nharaunda yekuvaka, kufambisa kushandiswa kweakasiyana michina michina, kuderedza basa revashandi vakakodzera vekuvaka, uye kuve nechokwadi chemhando yeprojekiti. Mukuwedzera, inogonawo kushandiswa mune mamwe mamiriro ezvinhu akaoma. Kubudirira kupedza mabasa ekuvaka munharaunda.
Iko kusanganiswa kwekongiri kunogona kupfupisa zvakanyanya nguva yekuchengetedza mushure mekuvakwa kwepurojekiti, nekudaro ichimhanyisa kukurumidza kudonhedza kweprojekiti, ichiita kuti formwork itendeuke nekukurumidza, uye ine yakakosha yekumhanyisa mhedzisiro pane inotevera yekusimbisa tensioning uye kuveura, kuita. nguva yose yekuvaka chirongwa. kupfupiswa zvikuru. Panguva imwecheteyo, kuwedzera kwekongiri admixturesinogonawo kuvandudza zvinobudirira kunaka kwese kwekongiri purojekiti, uye kuvandudza simba rayo, kusimba, kudzivirira kwechando, uye kusamira.
Mukuwedzera, inogona kuvandudza zvakanyanya shrinkage yekrete kana yakaoma zvakakwana uye inoyerera zvinhu zvisati zvasimbiswa. Kana iyo kongiri yakasanganiswa yakashandiswa nemazvo mukuvaka purojekiti, iyo yakasanganiswa kazhinji haizove nemhedzisiro pamhando yekuvaka kwekongiri, uye Inogonawo kuderedza zvakanyanya kushandiswa kwesimende uye zvakasiyana-siyana zvekubatsira zvinhu pasi pechikonzero chekushandiswa kwesainzi, uye kuderedzwa kwekushandiswa kwe-samende-based-axiliary materials haisi kungoponesa hupfumi hwevanhu, asiwo inochengetedza mari yekuvaka yegadziriro, uye ine simba rakanaka pamatanho anotevera. Iyo tamping uye troweling maitiro inopa nyore.
Nguva yekutumira: Oct-31-2022
