Kodi kuyesa simenti?

1, chitsanzo

Simenti yochuluka iyenera kutengedwa kuchokera ku chonyamulira simenti isanadyedwe mu mbiya. Pa matumba a simenti, woyeserera ayenera kugwiritsidwa ntchito kuyesa matumba osachepera 10 a simenti. Mukasankha, simenti iyenera kuyesedwa mowoneka ngati chinyezi chiwonjezeke. Kwa matumba a simenti, matumba 10 ayenera kusankhidwa mwachisawawa kuti ayese ndi kuwerengera kulemera kwake pakufika kulikonse.

2. Mikhalidwe yoyesera

Kutentha kwa labotale ndi 20 ± 2 ℃, chinyezi chachibale sayenera kuchepera 50%; Kutentha kwa zitsanzo za simenti, kusakaniza madzi, zida ndi zipangizo ziyenera kugwirizana ndi labotale;

Kutentha kwa bokosi lochiritsira chinyezi ndi 20 ± 1 ℃, ndi chinyezi chachibale sichochepera 90%.

3. Kutsimikiza kwa madzi akumwa kwa muyezo wa GB/T1346-2001

3.1 Zida ndi zida: chosakanizira cha simenti, chida cha vica

3.2 Nyowetsani chida ndi zida ndi nsalu yonyowa, yezani 500g ya simenti, kutsanulira m'madzi mkati mwa 5 ~ 10s, yambani chosakanizira, otsika liwiro kusakaniza 120s, siyani kwa 15s, ndiyeno kuthamanga kwambiri kusakaniza 120s kuyimitsa.

3.3 Njira zoyezera:

Pambuyo kusanganikirana, nthawi yomweyo kusakaniza zabwino simenti ukonde slurry mu mayeso nkhungu waikidwa pa galasi pansi mbale, amaika ndi mapaundi ndi mpeni, mokoma kunjenjemera kangapo, slurry pa owonjezera ukonde slurry; Pambuyo pakulinganiza, nkhungu yoyesera ndi mbale yapansi imasunthidwa ku chida cha veka, ndipo pakati pake imayikidwa pansi pazitsulo zoyesera, ndipo chipika choyesera chimatsitsidwa mpaka chikukhudzana ndi pamwamba pa slurry ya simenti. Pambuyo pomangitsa zomangira za 1s ~ 2s, zimamasuka mwadzidzidzi, kotero kuti chipika choyesera chimamira molunjika komanso momasuka mu ukonde wa simenti. Jambulani mtunda pakati pa lever yoyesera ndi mbale yapansi pomwe choyesacho chikasiya kumira kapena kutulutsa choyezera kwa masekondi 30. Ntchito yonse iyenera kumalizidwa mkati mwa mphindi 1.5. Kusasinthika kwa simenti slurry ndi matope a simenti omwe amamizidwa mu ndodo yoyesera ndi 6 ± 1mm ​​kutali ndi mbale ya pansi. Kuchuluka kwa madzi omwe amagwiritsidwa ntchito posakaniza ndi kufanana kwa simenti (P), yowerengedwa ngati peresenti ya simenti ya simenti.

4. Kutsimikiza kwa nthawi yoyika GB/T1346-2001

Kukonzekera chitsanzo: muyezo kugwirizana ukonde slurry opangidwa ndi madzi ndi kusasinthasintha muyezo anadzazidwa ndi nkhungu mayeso pa nthawi imodzi, scraped pambuyo kangapo kugwedera, ndipo nthawi yomweyo anaika mu chinyontho kuchiritsa bokosi. Lembani nthawi yomwe simenti imawonjezeredwa kumadzi ngati nthawi yoyambira nthawi yoyika.

Kutsimikiza kwa nthawi yoyika koyamba: zitsanzo zidachiritsidwa mubokosi lochiritsira chinyezi mpaka 30min mutathira madzi koyamba. Pamene singano yoyesera imamira pansi pa 4 ± 1mm, simenti imafika poyambira; Nthawi yoyambira kuwonjezera simenti m'madzi mpaka kufika pamalo oyamba ndi nthawi yoyambira ya simenti, yomwe imafotokozedwa mu "min".

Kutsimikiza kwa nthawi yomaliza yoyika: mutatha kutsimikiza kwa nthawi yoyamba, chotsani mwamsanga chitsanzocho ndi slurry kuchokera ku mbale ya galasi ndi kumasulira, ndikutembenuzira 180 °. Diameter of big end up, the little end on the glass plate, yonjezerani bokosi lochiritsira chinyezi pakukonza, pafupi ndi nthawi yomaliza yokhazikika kamodzi mphindi 15 zilizonse, pamene kuyesa singano mu thupi la 0.5 mm, ndiko kuti mphete inayamba kulephera kusiya chizindikiro. yesani thupi, fikirani malo omaliza a simenti, simentiyo iwonjezere madzi mpaka nthawi yomaliza ya nthawi yomaliza ya simenti, Mtengo ndi min.

Chisamaliro ayenera kuperekedwa kwa kutsimikiza, mu kutsimikiza koyamba kwa ntchito ayenera mokoma kuthandizira ndime zitsulo, kuti pang'onopang'ono pansi, kupewa mayeso singano kugunda kugundana, koma chifukwa ndi ufulu kugwa adzakhala kupambana; Pa nthawi yonse yoyezetsa, malo a singano akumira ayenera kukhala osachepera 10mm kutali ndi khoma lamkati la nkhungu. Kuyika koyambirira kukakhala pafupi, kuyenera kuyezedwa mphindi 5 zilizonse, ndipo nthawi yomaliza ikayandikira, iyenera kuyezedwa mphindi 15 zilizonse. Mukafika koyambirira kapena komaliza, iyenera kuyezedwanso nthawi yomweyo. Pamene mfundo ziwirizo zili zofanana, zikhoza kudziwika ngati kufika pa malo oyambirira kapena malo omaliza. Chiyeso chilichonse sichingalole kuti singano igwe mu pinhole yoyambirira, njira yonse yoyesera kuti tipewe kugwedezeka kwa nkhungu.

5. Kutsimikiza kwa kukhazikika kwa GB/T1346-2001

Kujambula kwachitsanzo: ikani chojambula chokonzekera cha Reisler pa mbale yagalasi yopaka mafuta pang'ono, ndipo nthawi yomweyo lembani slurry yokonzedwa bwino ndi Reisler kamodzi, ikani ndikuyipopera kangapo ndi mpeni pafupifupi 10mm m'lifupi, kenako pukutani, kuphimba pang'ono. mbale yagalasi yothira mafuta, ndipo nthawi yomweyo sunthani chitsanzocho ku bokosi lochiritsira chinyezi kwa 24 ± 2h.

Chotsani mbale yagalasi ndikuchotsa chitsanzocho. Choyamba yezani mtunda pakati pa nsonga za cholozera cha Reefer's clamp (A), yolondola mpaka 0.5mm. Ikani zitsanzo ziwirizo pa A test rack m'madzi otentha cholozera choyang'ana m'mwamba, ndiyeno zitenthetseni mpaka kuwira mu 30±5min ndikuwira kwa 180±5min.

Tsankho la zotsatira: Pambuyo pa kuwira, lolani madzi m'bokosilo, bokosilo litakhazikika mpaka kutentha, tulutsani chitsanzo choyezera, mtunda wa nsonga ya pointer (C), yolondola mpaka 0.5mm. Pamene mtengo wapakati wa mtunda wowonjezereka (CA) pakati pa zitsanzo ziwirizi siziposa 5.0mm, zimaganiziridwa kuti kukhazikika kwa simenti kuli koyenerera. Pamene kusiyana kwa mtengo wa (CA) pakati pa zitsanzo ziwirizo ndi zoposa 4.0mm, chitsanzo chomwecho chidzayesedwanso nthawi yomweyo. Pankhaniyi, kukhazikika kwa simenti kumaonedwa kuti ndi kosayenera.

6, njira yoyesera mphamvu ya simenti ya simenti GB/T17671-1999 

6.1 osakaniza chiŵerengero

Kusakaniza kwabwino kwa matope kuyenera kukhala gawo limodzi la simenti, magawo atatu a mchenga wokhazikika ndi theka la madzi (chiŵerengero cha simenti yamadzi 0,5). Konkire simenti 450g, 1350g muyezo mchenga, madzi 225 g. Kulondola kwa ndalamazo kuyenera kukhala ± 1g.

6.2 kugwedeza

Mphika uliwonse wa mchenga wa guluu umagwedezeka ndi blender. Ikani chosakaniza kuti chizigwira ntchito poyamba, kenaka tsatirani izi: onjezerani madzi mumphika, kenaka yikani simenti, ikani mphika pa chotengera, kukwera kumalo okhazikika. Kenako yambani makina, otsika liwiro kusakaniza 30s, 30s wachiwiri anayamba nthawi yomweyo kuwonjezera wogawana mchenga, kutembenuzira makina kwa liwiro kusanganikirana 30s, kusiya kusakaniza 90s, ndiyeno liwiro kusakaniza 60s, okwana 240s.

6.3 Kukonzekera kwa zitsanzo

Kukula kwa chitsanzo kuyenera kukhala 40mm × 40mm × 160mm prism.

Kupanga ndi tebulo logwedezeka

Mwamsanga pambuyo yokonza matope akamaumba, ndi supuni yoyenera mwachindunji mphika woyambitsa adzagawidwa magawo awiri a matope mu nkhungu mayeso, wosanjikiza, aliyense thanki pafupifupi 300g matope, ndi lalikulu wodyetsa ofukula chimango pamwamba pake. Chivundikiro cha nkhungu pamwamba pa nkhungu yoyesera m'mbali mwa poyambira chilichonse mtsogolo ndi mtsogolo pomwe wosanjikiza wa zinthuzo udamera, kenako kunjenjemera ka 60. Kenako ikani yachiwiri wosanjikiza matope, kubzala lathyathyathya ndi yaing'ono wodyetsa, ndi kunjenjemera 60 zina. Ndi chitsulo wolamulira pafupifupi 90 ° ngodya chimango pamwamba pa nkhungu mayeso, ndiyeno pamodzi kutalika malangizo nkhungu mayeso ndi yopingasa macheka zochita pang'onopang'ono kumapeto ena a kayendedwe, ndi kuposa mayeso nkhungu mbali ya mchenga kukwapula, ndi wolamulira yemweyo kuti pafupifupi mulingo wa pamwamba pa mayeso thupi.

6.4 Kusamalira zitsanzo

Chikombole choyesedwa chodziwika chidzayikidwa mu bokosi la simenti lochiritsira, lopangidwa pakati pa 20-24h. Chitsanzo cholembedwacho chimayikidwa nthawi yomweyo chopingasa kapena chopondapo m'madzi pa 20 ℃ ± 1 ℃ kuti chisamalidwe, ndipo ndege yopalasa iyenera kukhala m'mwamba ikayikidwa mopingasa.

6.5 Kuyesa ndi kuunika mphamvu

Mayeso opindika mphamvu:

Mphamvu ya flexural inayesedwa ndi njira yotsegulira pakati ndi makina oyesera mphamvu. Mayeso ophatikizika adachitika pa prism yosweka poyiyika pa choyesa mphamvu yokakamiza. Kupanikizika pamwamba kunali mbali ziwiri za thupi loyesera pamene linapangidwa, ndi dera la 40mm × 40mm. (Kuwerenga kwajambulidwa ku 0.1mpa)

Mphamvu yosinthika ndikuwerengera mwachindunji pamakina oyesera, unit (MPa)

Mphamvu zopondereza Rc (zolondola mpaka 0.1mpa) Rc = FC/A

Kuchuluka kwakukulu pakulephera kwa Fc—-,

A—- Chigawo choponderezedwa, mm2 (40mm×40mm=1600mm2)

Flexural mphamvu assessment:

Mtengo wapakati wa flexural resistance wa gulu la ma prism atatu umatengedwa ngati zotsatira zoyesera. Miyezo itatu yamphamvu ikapitilira kuchuluka kwapakati pa ± 10%, mtengo wapakati uyenera kuchotsedwa ngati zotsatira zoyesa mphamvu zosinthika.

Kuwunika kwamphamvu kwamphamvu: kuchuluka kwa masamu amphamvu zisanu ndi chimodzi zopezeka pagulu la ma prism atatu ndiye zotsatira zoyesa. Ngati chimodzi mwazinthu zisanu ndi chimodzi zoyezedwa chikuposa ± 10% mwa zisanu ndi chimodzi zomwe zikutanthawuza, zotsatira zake ziyenera kuchotsedwa ndipo zisanu zotsalazo zikutanthawuza. Ngati zambiri mwa zisanu zomwe zimayezedwa zipitilira kuchuluka kwake ± 10%, zotsatira zake sizikhala zovomerezeka.

7, njira yoyesera bwino (80μm sieve kusanthula njira) GB1345-2005

7.1 Chida: 80μm test screen, negative pressure screen analysis tool, balance (kugawa mtengo sikuposa 0.05g)

7.2 Njira yoyesera: kuyeza simenti ya 25g, ikani mu sieve yolakwika, kuphimba chivundikiro cha sieve, ikani pazitsulo za sieve, sinthani kupanikizika koipa kwa 4000 ~ 6000Pa. Pamene kusanthula kusanthula, ngati pali Ufumuyo chophimba chophimba, inu mokoma kugogoda, kotero kuti chitsanzo kugwa, pambuyo zounikira, ntchito moyenera kuyeza yotsala chinsalu.

7.3 Kuwerengera Zotsatira Gawo lotsalira la sieve yachitsanzo cha simenti imawerengedwa motere:

F ndi RS/W nthawi 100

Kumene: F - sieve yotsalira peresenti ya simenti chitsanzo,%;

RS - Misa ya zotsalira za simenti, G;

W - kuchuluka kwa zitsanzo za simenti, G.

Zotsatira zake zimawerengedwa ku 0.1%.

Zitsanzo zilizonse zidzayesedwa ndipo zitsanzo ziwiri zidzawunikiridwa mosiyana, ndipo mtengo wapakati wa zitsanzo zotsalira zidzatengedwa ngati zotsatira zowunikira. Ngati cholakwika chamtheradi chazotsatira ziwirizo chikukulirakulira kuposa 0.5% (ngati mtengo wotsalirawo uli wokulirapo kuposa 5.0%, ukhoza kuyikidwa ku 1.0%), kuyesa kwina kuyenera kuchitidwa, ndi tanthauzo la masamu pazotsatira ziwiri zofanana. ziyenera kutengedwa ngati chotsatira chomaliza.

8, kuyera kwa simenti yoyera

Posankha, kuyera kwa simenti ndi mtundu ziyenera kuyeza mowoneka ndikuyerekeza ndi kuyera kwachitsanzo.