Manual Liquid Limit Device

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Manual Liquid Limit Device (Casagrande) inoshandiswa kuona hunyoro hwevhu panobva ivhu revhu kubva mupurasitiki kuenda kumvura.Iwo Madhivhisi ane inogadzirika crank uye cam mechanism, inobhowa counter uye inobviswa kapu yendarira yakaiswa pachigadziko.

Dish-type liquid limit mita inoshandiswa kuyera mvura inogumira pavhu.Icho chishandiso chinoshandiswa pakugadzira nekuvaka kuitira kurongedza marudzi evhu, kuverenga kuenderana kwechisikigo uye plasticity index.

Kuedza maitiro

1. Isa sampuli yevhu mundiro inoputika, wedzera 15 kusvika 20 ml yemvura yakasvibiswa, dzokorora uye woikanya nebanga rekugadzirisa ivhu kusvika ranyatsosanganiswa, wowedzera 1 kusvika ku3 ml yemvura nguva imwe neimwe, uye nyatsosanganisa. maererano nenzira iri pamusoro.zvose.

2. Kana ivhu rakasanganiswa nemvura yakakwana kuti isvike pakugadzikana, zvakaenzana nekudonha 30 kusvika ku35 nguva kuti isanganise.Isa chikamu chevhu paste mundiro pamusoro apo ndiro inobata pasi ndiro.Shandisa banga rekugadzirisa ivhu kudzvanya ivhu rakanamira mune imwe chimiro, teerera pakuritsimbirira kashoma sezvinogoneka, uye kudzivirira mablister kuti asasanganiswa muvhu.Shandisa banga rinogadzirisa ivhu kuti utsvedze pamusoro pevhu, uye chikamu chakakora chevhu chakakora 1 cm.Iyo ivhu yakawandisa inodzoserwa mundiro inoputika, uye ivhu rakanamira mundiro rinotemwa pamwe nehupamhi ne groover kubva kumuteveri wecam.Yakanyatsotsanangurwa, yakatsanangurwa slot inoumbwa.Kuti udzivise mupendero wegorofu kubvaruka kana kuti ivhu rakanamira richitsvedza mundiro, shamhu dzinenge nhanhatu kubva mberi kuenda kumashure uye kubva kumashure kuenda kumberi dzinobvumidzwa kutsiva imwe groove, uye sitiroko imwe neimwe inodzika zvishoma nezvishoma kusvika panguva yekupedzisira.Kukurukurirana kwakakosha nechepasi kwendiro kunofanira kuwanikwa kakawanda sezvinobvira.

3. Shandura mubato wecrank F nekumhanya kwemarevolutions maviri pasekondi kuti ndiro yevhu isimuke nekudonha kusvika mahafu maviri evhu namira abata pazasi pemugero anenge 1/2 inch (12.7 mm).Rekodha nhamba yemahiti anodiwa kune 1/2 inch kureba kwegroove pasi pekubata.

4. Cheka chidimbu chevhu perpendicular kune slot kubva kudivi revhu kusvika kune rumwe rutivi, hupamhi hwayo hunenge hwakaenzana nehupamhi hwebanga rekucheka ivhu, kusanganisira ivhu pane yakavharwa slot, riise mubhokisi rekuyera rakakodzera, zviyere uye uzvisanganise.Record.Bika kuhuremu hwakasimba pa230°±9°F (110°±5°).Pakarepo mushure mekutonhodza uye musati masveta mumvura yakashambadza, chiyera.Nyora uremu mushure mekuoma sehuremu hwemvura.

5. Fambisa ivhu rakasara mundiro kune ndiro inoputika.Geza uye woomesa ndiro uye groover, uye rodha zvakare ndiro yekuedza kunotevera.

6. Shandisa ivhu rakasundirwa mudhishi rinoputika kuwedzera mvura kuti iwedzere kuyerera kwevhu, uye ita zvimwe zviedzo zviviri maererano nenzira iri pamusoro.Chinangwa ndechekuwana masampuli evhu ekuenderana kwakasiyana, uye nhamba yemadonhwe anodiwa kuita kuti majoini epasi pevhu aenderere pamwe chete anopfuura kana asingasviki makumi maviri neshanu.Nhamba yemadonhwe anowanikwa inofanira kuva pakati pe15 ne35 nguva, uye sampu yevhu inogara ichiitwa kubva kune yakaoma kusvika kune yakanyorova mukuedzwa.

7. Kuverenga

a Verengai mvura yemukati WN yevhu, inotaridzwa sechikamu chehuremu hwevhu rakaoma;

WN=(huremu hwemvura×huremu hwevhu rakaoma)×100

8. Dhirowa epurasitiki inoyerera curve

Ronga iyo 'plastic flow curve' papepa semi-logarithmic;inomiririra hukama pakati pehuwandu hwemvura uye nhamba yemadonhwe edhishi.Tora zviri mukati memvura seabscissa uye shandisa chiyero chesvomhu, uye shandisa nhamba yekudonha seyakarongeka uye shandisa chiyero che logarithmic.Iyo yepurasitiki inoyerera curve mutsara wakatwasuka, unofanirwa kupfuura nematatu kana anopfuura ebvunzo mapoinzi kusvika pazvinobvira.

9. Muganho wemvura

Pakuyerera kwemvura, mvura inoyerera pamadonhwe e25 yakatorwa semuganho wemvura yevhu, uye kukosha kwacho kwakatenderedzwa kune nhamba.

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