Video: Dab tsi yog qhov tseem ceeb ntawm kev teeb tsa lub sijhawm ntawm cov cement?
2024 Tus sau: Stanley Ellington | [email protected]. Kawg hloov kho: 2023-12-16 00:17
Teem sijhawm yog tseem ceeb rau lub hom phiaj xws li tuav, thauj, tso thiab muab cov duab xav tau rau pob zeb . Pib teem sijhawm - tus sij hawm thaum paste pib poob nws plasticity. Nws yog tseem ceeb fortransportation, tso thiab compaction ntawm cement pob zeb.
Yog li ntawd, dab tsi yog qhov tseem ceeb ntawm kev txiav txim siab teem sij hawm ntawm cov cement?
o Pib teem sijhawm xeem yog tseem ceeb rau kev thauj mus los, tso thiab compaction ntawm cement qhob. o Pib teem sijhawm lub sijhawm yuav tsum tau ua kom ncua cov txheej txheem dej los yog tawv. o Qhov kawg teem sijhawm yog sij hawm thaum lub paste kiag li poob nws splasticity.
Ib yam li ntawd, thaum twg yuav tsum kho cov pob zeb pib? Hauv ntej, cov curing yuav tsum pib tom qab yam tsawg kawg rau 6 teev (Lub sijhawm teem kawg ntawm cement ) thiab tsis pub tsawg tshaj 24 teev. Yog li ntawd, thaum kev kho pob zeb muaj pib isvaries thiab nyob ntawm seb thaum lub nto ntawm lub pob zeb pib qhuav.
Tsuas yog li ntawd, txhais tau li cas los ntawm kev teeb tsa lub sijhawm ntawm cov cement?
Pib teem sijhawm lub sijhawm yuav tsum tau ua kom ncua cov txheej txheem dej los yog tawv. Kawg teem sijhawm yog sij hawm thaum lub paste kiag li poob nws splasticity. Nws yog sij hawm coj rau cement xibhwb cement pob zeb kom tawv txaus thiab ua kom lub ntsej muag ntawm cov pwm uas nws raug pov.
Dab tsi yog qhov sib xws ntawm cov cement?
Tus qauv sib xws los yog kev sib raug zoo ntawm a cement muab tshuaj yog txhais raws li tus nqi ntawm cov dej (hauv feem pua ntawm qhov hnyav ntawm qhuav cement ) uas tso cai rau vicat plunger nkag mus rau qhov tob ntawm 5 mus rau 7 hli los ntawm hauv qab ntawm vicat pwm.
Pom zoo:
Lub npe dab tsi tau muab rau Wall Street kev sib tsoo ntawm 29th Lub Kaum Hli 1929 tseem hu ua kev lag luam poob ntawm xyoo 1929 uas ua rau muaj Kev Nyuaj Siab Loj nyob rau xyoo 1930 Kev Nyuaj Siab Loj yog lub ntiaj teb loj heev
Kev Nyuaj Siab Loj tau pib hauv Tebchaws Meskas tom qab muaj kev poob loj hauv cov nqi khoom lag luam uas pib thaum lub Cuaj Hlis 4, 1929, thiab tau dhau los ua xov xwm thoob ntiaj teb nrog kev lag luam lag luam poob ntawm Lub Kaum Hli 29, 1929, (lub npe hu ua Dub Tuesday). Nyob nruab nrab ntawm 1929 thiab 1932, thoob ntiaj teb cov khoom lag luam thoob ntiaj teb (GDP) poob los ntawm kwv yees li 15%
Dab tsi txaus ntshai zoo kawg li nws yog qhov peb yuav tsum tau khawb trenches thiab sim cov roj npog qhov ncauj qhov ntswg ntawm no vim muaj kev sib cav nyob hauv lub tebchaws nyob deb ntawm cov neeg uas peb tsis paub dab tsi?
Qhov txaus ntshai npaum li cas, zoo heev, zoo kawg yog tias peb yuav tsum tau khawb trenches thiab sim roj-qhov ncauj qhov ntswg ntawm no vim muaj kev sib cav nyob rau hauv ib lub teb chaws nyob deb ntawm cov neeg uas peb tsis paub dab tsi. Nws zoo nkaus li tseem tsis yooj yim dua tias kev sib cav uas twb tau hais tseg hauv txoj cai yuav tsum yog kev ua tsov rog
Dab tsi yog qhov tseem ceeb ntawm kev ntseeg thiab kev xav ntawm kev txhim kho lub koom haum?
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Dab tsi yog qhov tseem ceeb ntawm kev txiav txim siab ntawm tus nqi elasticity ntawm kev thov rau cov khoom?
Lub ntsiab lus txiav txim siab ntawm cov khoom lag luam elasticity yog qhov muaj cov khoom siv ze ze, lub sijhawm tus neeg siv khoom yuav tsum tau tshawb nrhiav cov khoom hloov pauv, thiab feem pua ntawm cov neeg siv khoom cov peev nyiaj uas yuav tsum tau yuav qhov zoo
Tus neeg twg tau soj ntsuam kev mloog lus ntawm kev sib raug zoo los ntawm kev ua ib qho kev sim uas yuav tsum muaj cov tub ntxhais kawm cov ntsiab lus los tswj cov kev mob siab rau cov ntsiab lus hauv kev tshuaj xyuas kev kawm?
Milgram Shock Experiment Ib qho ntawm cov kev tshawb fawb nto moo tshaj plaws ntawm kev mloog lus hauv kev puas siab puas ntsws tau ua los ntawm Stanley Milgram, tus kws kho mob hlwb ntawm Yale University. Nws tau ua ib qho kev sim qhia txog qhov tsis sib haum xeeb ntawm kev mloog lus rau txoj cai thiab lub siab ntawm tus kheej