1. Chinyorwa chemukati uye chiyero chekushandisa
Iyi nzira inotsanangura midziyo uye matanho ekushanda ekugadzirisa kuyerera kwesamende dhaka.
Iyi nzira inoshandiswa pakutemerwa kwedhaka fluidity yegomo rinoputika Portland simende, composite Portland simende, yakajairwa Portland simende yakasanganiswa nemadota anoputika, slag Portland simende uye mamwe marudzi esimende akasarudzwa kushandisa nzira iyi.
2. Reference standards
GB177 Cement dhaka simba rekuyedza nzira
GB178 Yakajairwa jecha rekuyedza simende simba
JBW 01-1-1 Yakajairwa sampuli yekuyerera kwesamende dhaka
3. Nzira yekuona nzira yekudzikisa mvura yedhaka ndeyotevera:
3.1 Zvishandiso nemidziyo
A. Mortar mixer;
B. Jump tafura (5mm gobvu girazi ndiro inofanira kuwedzerwa);
C. Cylindrical ramming bar: yakagadzirwa nesimbi, dhayamita 20mm, kureba anenge 185mm;
D. truncated cone denderedzwa mold uye mold chivharo: truncated cone denderedzwa mold size, kureba i 60±0.5mm, yepamusoro dhayamita φ 70±0.5mm, yakaderera dhayamita 100±0.5mm, chifukidzo chekuumba chinofanira kufananidzwa ne truncated cone denderedzwa mold, truncated yesimbi yakavharwa;
E. Mutongi (kuyeresa chiyero 300mm) kana calipers ane kuyerwa siyana 300mm;
F. spatula.
G. Mishonga yemishonga (inorema 1000g, kunzwa 1g).
3.2. Test maitiro
3.2.1 Kuyera kushandiswa kwemvura yereferensi dhaka
A. Weresa 300g sement ne750g standard jecha wozvidira muhari yekuvhenganisa, tanga musanganisi, wowedzera mvura zvishoma nezvishoma mushure mekusanganisa kwema5, woisa mukati memakore makumi matatu. Rega kumhanyisa kwe3min mushure mekutanga muchina. Bvisa dhaka kubva pamashizha uye bvisa pani inomutsa.
B. Mukuvhenganisa dhaka panguva imwe chete, nemucheka wakanyorova pukuta svetuka tafura yetafura, ramming tsvimbo, cheka koni yakatenderedza mold uye mold cover yemukati madziro, uye uzviise pakati pegirazi ndiro, yakafukidzwa nemucheka wakanyorova.
C. Iyo yakavhenganiswa dhaka inokurumidza kukamurwa kuita zvidimbu zviviri muforoma, iyo yekutanga yakaiswa kune cone mold inenge zvikamu zviviri kubva muzvitatu zvakakwirira, ine ramming bar kubva kumucheto kusvika pakati yakaenzana yakaiswa ramming kane gumi neshanu, zvino inotakurwa nechikamu chechipiri chedhaka, yakasungirirwa kusvika anenge maviri masendimita akakwirira kupfuura denderedzwa mold, iyo yakafanana cylindrical tsvimbo gumi. Pakuisa jecha neramming, dzvanya truncate cone die neruoko kudzivirira kufamba.
D. Mushure mekutambisa, bvisa chifukidziro chekuumbwa, shandisa spatula kuti ubvise dhaka iyo yakakwirira kudarika truncated cone denderedzwa mold uye uipukute iyo yakatsetseka, uye zvinyoronyoro simudza denderedzwa mold vertically kumusoro. Bata maoko nekukwenya kwevhiri kuita kuti tafura yekusvetuka isvetuke kanokwana makumi matatu pamwero weimwe pasekondi.
E. Mushure mokurova, shandisa calipers kuyera diffusion dhayamita yedhaka pasi, uye tora avhareji ukoshi maviri madhayamita perpendicular kune mumwe sezvo kuparadzirwa dhaka apo mvura inoshandiswa, inoratidzwa mm. Kana dhaka rereferensi diffusivity iri 140 ± 5mm, kushandiswa kwemvura ndiko kushandiswa kwemvura kwereferensi yedhaka diffusivity.
3.2.2 Maererano ne 3.2.1 nzira, kushandiswa kwemvura yedhaka ine mvura-inoderedza agent yakasvika 140±5mm.
3.3. Muyero wekudzikisa mvura yedhaka rakacheneswa inoverengerwa sezvizvi:
Mvura inoderedza chiyero chedhaka (%) = (W0-W1)/ W0 ×100
Iko, w0 - kushandiswa kwemvura (g) kana kupararira kwedhaka rereferensi kuri 140±5mm;
W1 - Kushandiswa kwemvura (g) kana kuparadzirwa kwedhaka neinoderedza mvura iri 140±5mm.
Kukosha kwechiyero chekudzikisa mvura ndiyo arithmetic mean value yemasampuli matatu.
Nguva yekutumira: Kubvumbi-25-2024