Nzira yekuedza sei kuderedza mvura yedhaka?

1. Zviri mukati menyaya uye huwandu hwekushandiswa kwayo

Nzira iyi inotsanangura michina nematanho ekushanda pakuona kuyerera kwesimbi yesimbi.

Nzira iyi inoshanda pakuona kuyerera kwevhu remugodhi rePortland simende, simende yePortland yakagadzirwa pamwe chete, simende yakajairika yePortland yakasanganiswa nevhu remugodhi, simende yePortland yakagadzirwa neslag nedzimwe mhando dzesimende dzakashandiswa nenzira iyi.

2. Mitemo yekutarisa

Nzira yekuyedza simba redhaka resimende yeGB177

GB178 Jecha rakajairika rekuyedza kusimba kwesimende

JBW 01-1-1 Muenzaniso wenguva dzose wekuti simende inoyerera sei

3. Nzira yekuona mwero wekuderedza mvura yedhaka ndeiyi inotevera:

3.1 Zvishandiso nemidziyo

A. Musanganiswa wedhaka;

B. Tafura yekusvetuka (ndiro yegirazi ine ukobvu hwe5mm inofanira kuwedzerwa);

C. Bhandi resimbi rakaumbwa nesimbi: rakagadzirwa nesimbi, dhayamita 20mm, kureba kuri 185mm;

D. Koni yakachekwa yakatenderera uye chifukidziro chemould: koni yakachekwa yakatenderera saizi yemould, kureba kwayo 60±0.5mm, dhayamita yepamusoro φ 70±0.5mm, dhayamita yakaderera 100±0.5mm, chifukidziro chemould chinofanira kuenzaniswa nekoni yakachekwa yakatenderera, koni yakachekwa yakatenderera uye chifukidziro chemould chakagadzirwa nezvinhu zvesimbi;

E. Ruler (nzvimbo yekuyera 300mm) kana macaliper ane nzvimbo yekuyera 300mm;

F. spatula.

G. Kuyera kwemushonga (kurema 1000g, kunzwa 1g).

3.2. Maitiro ekuyedza

3.2.1 Kuyera kushandiswa kwemvura kwedhaka rekutarisa

A. Yera simende 300g nejecha re750g wozvidurura mupoto yekusanganisa, tanga muchina wekusanganisa, wedzera mvura zvishoma nezvishoma mushure mekusanganisa kwemaminitsi mashanu, wozowedzera mukati memaminitsi makumi matatu. Rega kusanganisa kwemaminitsi matatu mushure mekutanga muchina. Bvisa dhaka kubva pamapanga wobvisa pani yekusanganisa.

B. Mukusanganisa dhaka panguva imwe chete, nejira rakanyorova, pukuta tafura yekusvetuka, ramming rod, cheka koni yakatenderera mold uye mold cover mukati memadziro, wozviisa pakati pegirazi, zvakafukidzwa nejira rakanyorova.

C. Dura rakasanganiswa rinokamurwa nekukurumidza kuita zvikamu zviviri muchimiro, chikamu chekutanga chinoiswa pachimiro chekoni chakareba zvikamu zviviri kubva muzvitatu, nedanda re ramming kubva kumucheto kusvika pakati rakaiswa zvakaenzana richikamurwa kagumi nemashanu, wozoiswa chikamu chechipiri chedura, chakaiswa kusvika pamasendimita maviri akakwirira kupfuura chimiro chakatenderera, tsvimbo imwecheteyo ichikamurwa kagumi nemashanu. Paunenge uchiisa jecha ne ramming, dzvanya truncate cone die neruoko kudzivirira kufamba.

D. Mushure mekudhonza, bvisa chifukidziro chemold, shandisa spatula kubvisa mortar yakakwira kupfuura cone yakachekwa denderedzwa moipukuta, wobva wasimudza zvinyoro nyoro mold yakatwasuka yakatwasuka mudenga. Bata maoko ne crank yevhiri kuti tafura yekusvetuka isvetuke ka30 pasekondi imwe chete.

E. Mushure mekurova, shandisa macaliper kuyera dhayamita yekupararira kwepasi pemota, uye tora avhareji yehukuru hwemadhayamita maviri akatarisana sehuwandu hwemota painoshandiswa mvura, inoburitswa mu mm. Kana mota iri 140±5mm, kushandiswa kwemvura ndiko kushandiswa kwemvura kwemota iri 140±5mm.

3.2.2 Zvichienderana nenzira ye3.2.1, kushandiswa kwemvura kwedhaka rine chinhu chinoderedza mvura kwakasvika 140±5mm.

3.3. Mwero wekuderedza mvura yedhaka rakagadziriswa unoverengwa seizvi:

Kuderedzwa kwemvura mudhaka (%) = (W0-W1)/ W0 ×100

Kupi, w0 — kushandiswa kwemvura (g) kana kupararira kwedhaka rekutarisa kuri 140±5mm;

W1 — Kushandiswa kwemvura (g) kana kupararira kwedhaka rine chinhu chinoderedza mvura kuri 140±5mm.

Kukosha kwehuwandu hwemvura inoreva avhareji yehuwandu hwemasampuli matatu.