Ƙaddamar da ƙarfin a cikin situ kankare

(Ƙaddamar da ƙarfin in situ kankare)

Menene ƙarfin farko na kankare?

An ba da rahoton wasu bincike kan aikin balagagge a cikin yanayin sanyi; duk da haka, wannan binciken ya dogara ne akan maganin zafi. Ayyukan hanyar don tsinkayar ƙarfin farkon shekarun siminti a cikin yanayin sanyi ba tare da maganin zafi ba har yanzu yana buƙatar bincika. Bugu da ƙari kuma, babu wani bincike a cikin buɗaɗɗen wallafe-wallafen da ya bincika alaƙar da ke tsakanin ƙarfin wurin da ƙarfin da aka kiyasta ta amfani da hanyar balaga a lokacin ƙuruciya (kwanaki 1-3) da kuma lokacin sanyi (kasa da 10 ° C), don haka buƙatar wannan binciken. . Dukansu hanyar silinda na yau da kullun da kuma hanyar balaga ana kwatanta su da ainihin ƙarfin kankare don fahimtar aikinsu a fili wajen ƙididdige ƙarfin siminti na sanyi. An gudanar da binciken na yanzu a Canberra, Ostiraliya, kuma an tsara shi don daidaita yanayin hunturu na Canberra. An san birnin da sanyin sanyi da lokacin zafi. A cikin hunturu, yawan zafin jiki da dare zai iya faɗuwa ƙasa da 0 ° C yayin da matsakaicin zafin rana ya kai 14 ° C. Daidaitaccen hanyar warkewa a cikin wannan yanki shine kiyaye tsari a wurin: adana danshi. Daidaitaccen silinda da hanyoyin balaga bisa silinda da aka ajiye a cikin akwati da aka keɓe galibi ana amfani da su don ƙididdige ƙarfi. Kamar yadda Tank da Carino suka faɗa, hanyar Nurse-Saul ta dogara ne akan abubuwan da suka dace kuma ta isa kawai a ƙarƙashin wasu yanayi. Lokacin da samfura daban-daban na ƙwarewar da aka ba da keɓaɓɓen yanayin zafi na farkon shekaru, hanyar ba ta wakilci daidai tasirin warkewar zafin jiki akan haɓaka ƙarfi. Hanyar balaga ta Arrhenius, wacce ke ba da lissafin adadin ruwan siminti wanda ba shi da tushe, sakamakon yanayin zafi, Hansen da Pedersen suka haɓaka daga baya. Saboda fa'idarsa, hanyar balaga ta kasance cibiyar bincike don tantance ƙarfin cikin-wuri na siminti. Hanyoyi daban-daban, ma'auni da bambancin hanyar an tsara su kuma an yi amfani da su a duk duniya.

Ƙaddamar da ƙarfin a cikin situ kankare

Mahimman ayyukan gine-gine, kamar kawar da tsarin aiki, bayan tashin hankali, ɗaga membobin da aka riga aka ambata, da ƙarewar kariyar yanayin sanyi, suna buƙatar ƙaddara ƙarfin situ situ. Jira da yawa don yin waɗannan ayyukan na iya zama tsada, amma yin aiki da wuri zai iya cutar da tsarin. Misali na ƙarshe na wannan shine ci gaba da rugujewar wani yanki na ginin benaye a gundumar Fairfax, Virginia, Amurka, a cikin 1973, wanda ya ci rayukan mutane 14 kuma ya yi sanadin jikkata 34 da gazawar ginin hasumiya mai sanyaya a Willow. Island, West Virginia, Amurka, a cikin 1978, wanda ya kashe mutane 51. Waɗannan gazawar sun fara bincike a fannin kimanta ƙarfin siminti yayin gini. Hanyar balaga ta ƙididdige ƙarfin kankare bisa ga haɗakar tasirin lokaci da zafin jiki. Ana iya gano asalin hanyar zuwa jerin takaddun da ke magana da ingantattun hanyoyin warkewa. McIntosh ya yi bincike kan gyaran wutar lantarki na kankare kuma ya gano cewa adadin ruwa ya yi daidai da yankin da ke ƙarƙashin yanayin zafin jiki-lokaci sama da zafin datum na 30°F (zazzabi wanda kusan hydration ya ƙare). McIntosh ya kira wannan yanki 'tushen shekaru' na simintin kuma ya auna shi a cikin awanni °F ×. Ma'aikaciyar jinya ta bincikar maganin tururi na kankare kuma ta tsara samfurin lokaci da zafin jiki akan ƙarfin simintin da aka bayyana a matsayin adadin ƙarfin simintin bayan kwanaki 3 na ajiya a matsakaicin zafin jiki. Ma'aikaciyar jinya ta yi amfani da masu lankwasa don ƙididdige mafi ƙarancin yanayin tururi don cimma manufa da ƙarfin kankare bayan wani takamaiman yanayin warkar da tururi. Shawulu ya binciki ƙa'idodin da ke ƙunshe da maganin tururi na kankare a yanayin yanayi. Ya bayyana balaga a matsayin shekarun kankare da aka ninka ta matsakaicin zafin jiki sama da daskarewa, wanda simintin ya kiyaye. Don haɗin kai, Shawulu ya bayyana cewa ƙarfin siminti ya kasance koyaushe duk abin da ya haɗu da yanayin zafi da lokaci don daidaita balaga.

Ƙaddamar da ƙarfin cikin-wuri na kankare: Ƙarfin Core

Ƙarfin mahimmanci shine hanya mai mahimmanci don ƙayyade ƙarfin siminti a cikin wuri. Don haka, ana amfani da shi sau da yawa don daidaita wasu hanyoyin. Duk da haka, ƙarfin matsi na ainihin samfuran gabaɗaya ya fi na silinda na al'ada saboda tsarin hakowa. Abubuwa irin su tsawon-zuwa diamita rabo, diamita, da jiyya na asali suna shafar ƙarfin ainihin samfuran. Wannan binciken yana kwatanta ƙarfin mahimmanci tare da ƙarfi daga hanyar balagagge, wanda ya dogara da daidaitattun silinda. Ya kamata a yi kwatancen ƙarfin mahimmanci tare da ƙarfin balagagge bayan gyaggyara ƙarfin mahimmanci don yin la'akari da dalilai kamar diamita, tsayin tsayi zuwa diamita, da tasirin aikin hakowa. Ma'auni, irin su AS 1012.14 da ACI 214.4R, suna ba da irin waɗannan hanyoyin don gyara babban ƙarfin. Wannan rahoto ya bi hanyar ACI 214.4R yayin da yake lissafin ƙarfin raguwa da ke fitowa daga ainihin aikin hakowa. An yi la'akari da mafi munin ƙididdiga a cikin nau'i na 24 h-300 mm, yayin da mafi kyawun ƙididdiga a cikin yanayin 72 h-150 mm. Silinda daidaitattun sun ƙididdige ƙarfin kankare ta 76% a bayyanar T1 don samfurori na 24 h-300 mm, yayin da yake ba da kusan ƙarfin ɗaya kamar ainihin don 72 h-150 mm samfurori a bayyanar T2. Madaidaitan silinda ba za su iya ƙididdige ƙarfin 24 h-300 samfuri daidai ba saboda ƙarancin shekarun simintin da mafi girman kauri. Don siminti na Portland, matsakaicin ƙimar yanayin zafi yana faruwa a cikin sa'o'i 24 na farko. Don haka, ana samun ƙarin zafi a cikin siminti a cikin wannan lokacin. Wannan haɓakar zafi mafi girma yana haifar da ingantacciyar bambanci tsakanin silinda da slabs fiye da simintin da aka gwada a 72 h. Misali, don katakon B3-72T1-300, an lura da matsakaicin zafin jiki na 35°C a kusa da alamar 9.5h. A sa'a 24th, dutsen yana da zafin jiki na 26 ° C yayin da silinda ke da zafin jiki na 8 ° C kawai. A sa'a 70th, dutsen yana da zafin jiki na 5.5 ° C yayin da silinda ke da zafin jiki na 7 ° C, yana nuna bambanci mai yawa tsakanin slab da silinda. Siminti a cikin katako yana amfani da mafi girman zafin jiki a farkon shekaru, yana haifar da ƙarfi mafi girma. A kwatanta, yawan hydration a cikin silinda yana da mummunar tasiri ta ƙananan zafin jiki na yanayi.

Kankare mai ba da ƙarfi da wuri

Idan kuna neman ƙarfin farkon kankare mai inganci, da fatan za a iya tuntuɓar mu kuma ku aiko da tambaya. (sales@cabr-concrete.com). Muna karɓar biyan kuɗi ta Katin Kiredit, T/T, West Union, da Paypal. TRUNNANO zai jigilar kayan ga abokan ciniki a ketare ta hanyar FedEx, DHL, ta iska, ko ta ruwa.

(Ƙaddamar da ƙarfin in situ kankare)