Mphamvu ya simenti ndi kusakanikirana kosakanikirana pamtundu wa konkire

(1) Pamene alkali zili mu simenti ndi mkulu, fluidity wa konkire adzachepa ndi kugwa kutayika adzawonjezeka pakapita nthawi, makamaka ntchito madzi kuchepetsa okhutira ndi otsika sulphate okhutira. Zotsatira zake zimakhala zoonekeratu, pamene wochepetsera madzi wokhala ndi sulphate wambiri akhoza kusintha kwambiri izi. Izi zili choncho makamaka chifukwa calcium sulfate yomwe ili m'magulu ochepetsera madzi otsika kwambiri amapangidwa panthawi ya kaphatikizidwe ndi neutralization, ndipo imakhala ndi madzi abwino kwambiri. Choncho, pogwiritsira ntchito simenti yapamwamba ya alkali, kuwonjezera kuchuluka kwa sodium sulfate ndi hydroxyhydroxy acid salt retarders pamene kuphatikizira ndi kuchepetsa madzi kumapangitsa kuti madzi azisungunuka komanso kugwa kwa konkire.

(2) Simenti ikakhala yamchere ndipo pH ya polycarboxylate yochepetsera madzi ikatsika, konkireyo imayamba kupanga acid-base neutralization reaction. Sikuti kutentha kwa konkire kudzakwera, komanso kumathandizira kuti simenti ikhale yotentha. The fluidity ndi kugwa kwa konkire kudzasonyeza kutayika kwakukulu mu nthawi yochepa. Choncho, mukakumana ndi simenti zofanana, ndi bwino kuti musagwiritse ntchito zochepetsera za citric acid koma m'malo mwake mugwiritse ntchito zowonjezera zamchere, monga sodium hexametaphosphate, sodium polyphosphate, ndi zina zotero, zomwe zimakhala zogwira mtima kwambiri.

(3) Pamene zinthu za alkali mu simenti zimakhala zochepa, madzi a konkriti amakhala ochepa. Zotsatira za kuchuluka kwa mlingo moyenera sizidziwikiratu, ndipo konkire imakhala ndi madzi otaya magazi. Chifukwa chachikulu cha chodabwitsa ichi ndi chakuti sulphate ion zili mu simenti ndi zosakwanira, zomwe zimachepetsa zotsatira za kulepheretsa hydration ya tricalcium aluminate mu simenti. Panthawiyi, sulphate yambiri monga sodium thiosulfate iyenera kuwonjezeredwa panthawi yophatikizana kuti iwonjezere alkali yosungunuka mu simenti.

(4) Pamene konkire imatulutsa matope achikasu, imakhala ndi mapini ambiri ndi thovu, zikhoza kutsimikiziridwa kuti mowa wa amayi ndi simenti zimakhala zovuta kuti zigwirizane. Panthawiyi, ethers, esters, aliphatic ndi mowa wina wa amayi akhoza kuwonjezeredwa. Pa nthawi yomweyo, m`pofunika kuganizira kuchepetsa kuchuluka kwa madzi koyera kuchepetsa mowa mowa, kuwonjezera melamine ndi sodium hexametaphosphate ndiyeno ntchito mlingo woyenera wa defoaming wothandizira. Pewani kugwiritsa ntchito zinthu monga thickeners. Kugwiritsa ntchito thickeners sikungapangitse thovu kutuluka, zomwe zimapangitsa kuti pakhale mpweya wambiri, kuchepa kwa konkriti komanso kuchepa kwamphamvu koonekeratu. Ngati ndi kotheka, tannic acid kapena lead lead akhoza kuwonjezeredwa.

(5) Pamene chigawo chotulutsa thovu cha chothandizira chopera mu simenti chakwera, konkire imakondanso kukhala yachikasu ndipo dziko limakhala losauka kwambiri atakhala chete kwa masekondi 10. Nthawi zina amakhulupirira molakwika kuti kuchepetsa madzi ochepetsera madzi ndipamwamba kwambiri kapena mpweya wochuluka umawonjezeredwa panthawi yophatikiza. M'malo mwake, ndizovuta ndi chithandizo chopera simenti. Mukakumana ndi vutoli, defoamer iyenera kugwiritsidwa ntchito molingana ndi kuchuluka kwa thovu la chithandizo chogaya, ndipo cholumikizira mpweya sichingagwiritsidwe ntchito pakuphatikiza.