Kwanan Wata:11, Satumba,2023

Tun daga shekarun 1980s, a hankali a hankali ana haɓaka abubuwan da ake amfani da su a cikin ruwa, da kuma amfani da su a kasuwannin siminti na cikin gida, musamman a cikin siminti mai ƙarfi da famfo, kuma sun zama abubuwan da ba dole ba. Kamar yadda Malhotra ya yi nuni a taron farko na kasa da kasa kan hada-hadan kankara: “Haɓaka da kuma amfani da na’urorin rage ruwa masu inganci wani muhimmin ci gaba ne a ci gaban fasahar da aka samu a ƙarni na 20.” An sami wasu muhimman ci gaba a cikin fasahar siminti tsawon shekaru, ɗaya daga cikinsu shi ne haɓakar iskar da aka samu a cikin shekarun 1940, wanda ya canza fuskar fasahar siminti a Arewacin Amirka;Superplasticizerwani babban ci gaba ne wanda zai yi tasiri mai yawa wajen samarwa da aikace-aikacen siminti na shekaru masu zuwa.

Superplasticizera wasu kasashen da aka fi kirasuperplasticizer, Kamar yadda sunan ya nuna, yana da matukar dacewa don shirye-shiryen haɗin gwal na superplasticized. Hakika, ya fi dacewa da hadawa gaurayawan tare da babban kwarara, babban slurry girma da low ruwa-daure rabo, wato, yin famfo high-ƙarfi kankare.

Duk da haka, ga wasu simintin, kamar simintin da aka zuba a cikin ginin dam ɗin ruwa, matsakaicin girman ɓangarorin jimlar yana da girma (har zuwa 150mm), ƙarar slurry ƙarami ne kuma kwararar ba ta da girma, kuma simintin yana buƙatar dunƙulewa. ta yin amfani da ƙaƙƙarfan rawar jiki ko aikin mirgina, babban mai rage ruwa mai inganci bazai dace ba. Don kiyaye rabon ruwa mai ɗaurin ruwa ba canzawa ba, don saduwa da ma'auni na kayan aikin injiniya da ake buƙata ta tsarin tsarin, rage yawan ruwa, da rage kayan siminti kamar yadda ra'ayin, yawancin gine-ginen hydraulic dam na gida kuma suna haɗuwa tare da babban inganci. mai rage ruwa. A hakikanin gaskiya, irin wannan aikace-aikacen yana da matsala, saboda a baya an haɗa shi da ruwa mai ruwa da iska da iska ko kuma nau'in lignin na rage ruwa na yau da kullum, rage yawan ruwan su yana da ƙananan, kuma saboda tasirin iska yana ƙara yawan slurry, don haka. lokacin da aka rage yawan ruwa da adadin siminti a lokaci guda, wato, lokacin da aka rage yawan slurry, zai iya kula da ma'auni mara kyau. Tabbatar da cewa akwai isasshen sarari don cika jimlar, kunsa tara kuma samar da slurry mai aiki yana da mahimmanci don haɗawa da cakuda bayan an zubar.

Bugu da kari, da compressive ƙarfi na cakuda tare da high dace ruwa rage wakili don rage ruwa daure rabo za a iya ƙwarai inganta bayan hardening, amma lankwasawa ƙarfi girma kudi yawanci in mun gwada da kananan, da fatattaka ji na ƙwarai zai ƙara, don haka a general. da gina kankare Pavement ko gada panel ya kamata a yi hankali da high dace ruwa rage wakili. A gaskiya ma, a cikin shirye-shiryen mafi girma na C30 a cikin gine-ginen gine-gine da aikin injiniya na jama'a (ya kamata a yi la'akari fiye da 1/2 na jimlar) ko wasu ƙananan ƙarfin ƙarfi na simintin famfo, babban mai rage ruwa mai inganci ba lallai ba ne, ko ba abu ne mai mahimmanci ba.