Halayen Inji da Rashin Nasarar Simintin da aka Ƙarfafa da Fiber: Tasirin Nau'in Fiber da Abubuwan da ke Ciki
Siminti shine mafi yawan amfani Gine-gine Kayan aiki. Yana ba da fa'idodi da yawa, gami da yawan samuwa, sauƙin tsarin samarwa, ƙarancin farashi, da sauƙin amfani. Ana amfani da shi sosai a fannoni daban-daban kamar gine-gine, hanyoyi, gadoji, ramuka, da injiniyan ruwa. Yayin da ayyukan injiniya suka bunƙasa, buƙatun aikin siminti suma sun ƙaru a hankali. Sakamakon haka, gazawar siminti na gargajiya, kamar ƙarancin ƙarfin tauri, rashin juriyar tsagewa, da rashin daidaiton girma, sun bayyana. Saboda haka, inganta aikin siminti koyaushe yana ɗaya daga cikin manyan jagororin bincike a fannin injiniyan jama'a.
Domin inganta aikin siminti, yawanci ana ƙara zare don inganta halayen injina da tauri. Misalan sun haɗa da Zaren Karfes (SF), zaruruwan roba (kamar zaruruwan polypropylene), zaruruwan ma'adinai (kamar zaruruwan basalt - BF), da zaruruwan carbon (CF). Wannan hanyar ta ƙara haɓaka aikin siminti mai ƙarfi (HPC) da siminti mai ƙarfi (UHPC).
Zaruruwa na iya, har zuwa wani mataki, inganta halayen injiniya na siminti. Duk da haka, nau'ikan zaruruwa daban-daban da abubuwan da ke ciki ba makawa suna haifar da manyan bambance-bambance a tasirinsu ga halayen injiniya na siminti. A halin yanzu, mafi kyawun abun ciki na zare, alaƙar adadi tsakanin sigogi masu dacewa da halayen injiniya, da kuma hanyoyin da ke ƙarƙashin simintin da aka ƙarfafa fiber har yanzu suna buƙatar ƙarin bayani. Wannan binciken ya binciki zaruruwan carbon (CF), Zaruruwan basalt (BF), da zare na ƙarfe (SF) a matsayin waɗanda aka yi bincike a kansu, suna shirya samfuran siminti tare da abubuwan da ke cikin zare daban-daban. An zaɓi waɗannan zare saboda ingantaccen aikinsu a cikin siminti da aikace-aikacensa mai yawa. Ta hanyar gwaje-gwajen da aka sarrafa masu canzawa, an yi nazarin tasirin nau'in zare da abun ciki akan ƙarfin matsewa, modulus na roba, da yanayin gazawar siminti cikin tsari. Haɗa hotunan dijital da dabarun nazarin microscopy na lantarki (SEM), an lura da halayyar juyin halittar siminti mai ƙarfi da fiber a lokacin gwaje-gwajen, wanda ya haifar da ƙarshe mai zuwa:
1. Idan aka kwatanta da siminti na yau da kullun (PC), haɗa zaruruwan ƙarfe (SF), zaruruwan carbon (CF), da Zaruruwan basalt (BF) ya inganta halayen injiniya na simintin da aka ƙarfafa fiber (FRC) sosai kuma ya canza yanayin gazawarsa. Waɗannan zaruruwan sun canza ƙanƙantar simintin da halayen matse ramuka na farko. Yayin da yawan zaruruwan ke ƙaruwa, yanayin gazawar ya canza daga karyewa zuwa ductile. Mahimmin wurin sauyawa shine 0.5% ga simintin zaren ƙarfe (SFC) da 1.0% ga simintin zaren carbon (CFC) da simintin basalt (BFC). Don haɓaka aikin injiniya, mafi kyawun abun ciki don zaruruwan ƙarfe shine 2.0%, ga zaruruwan carbon 1.0%, da kuma ga zaruruwan basalt 0.5%.
2. Duk da cewa yawan zare na iya inganta ƙanƙantar da ƙarfin ɗaukar siminti, yawan abun ciki da ya wuce kima na iya haifar da wani abu mai "jimrewa", wanda ke haifar da "tarin zare." Wannan yana yin mummunan tasiri ga halayen simintin, ƙarfi, da halayen nakasa. Simintin zare na ƙarfe ya sami mafi kyawun aiki a ƙaramin girman zare na 2.0%, yayin da simintin zare na carbon da simintin zare na basalt suka kai mafi kyawun aikinsu a 1.0% da 0.5%, bi da bi. Bayan waɗannan abubuwan da suka fi kyau, aikin ya ragu.
3. Binciken Scanning Electron Microscopy (SEM) ya nuna cewa haɗin da ke tsakanin zare da matrix na siminti yana da tasiri sosai ga halayen injiniya na siminti. Adadin zare mai dacewa yana samar da tsarin hanyar sadarwa mai girma uku a cikin simintin, yana haɓaka haɗin matrix da aikin gabaɗaya. Duk da haka, yawan zare yana haifar da haɗa zare, yana haifar da raunin yankunan haɗin fuska da rage yawan siminti da ƙarfi. Canje-canje a cikin ƙananan tsarin sun yi daidai da juyin halittar halayen injiniya na macroscopic.
4. Ƙara zare ya canza yanayin lalacewar siminti sosai. Idan aka kwatanta da siminti mai sauƙi, simintin da aka ƙarfafa da fiber ya nuna inganci mafi girma bayan faɗuwa, tare da raguwar tsagewa da kunkuntar tsagewa, da kuma ƙaruwar tauri. Zaren ƙarfe sun fi tasiri wajen hana tsagewa, sai kuma zaren carbon da zaren basalt. "Tasirin haɗa zare" ya taka muhimmiyar rawa wajen hana yaɗuwar tsagewa, yayin da "tasirin haɗakarwa mai rauni" ya yi mummunan tasiri ga halayen injiniya.
