Waxyaalaha Saameeya Saamaynta Wax-yaraynta Biyaha

Different types of cement, the plasticizing effect of the water reducing agent is also different.The mineral composition, chemical composition and form of gypsum (as a coagulant) of cement clinker will affect the plasticizing effect of the water reducing agent.In addition, the fineness of the cement, the type and amount of the mixed materials, the freshness, the moisture content, and the temperature may also affect the plasticizing effect of the water reducing agent.

The mineral composition is most affected by the C3A and C2S components.The cement with high C3A content has a poor water-reducing effect, which is because C3A adsorbs the water-reducing agent much higher than other mineral components (a few times larger than C3S).The slag mixture has the least amount of adsorption to the water reducing agent.After the water reducing agent is incorporated into the cement slurry system, the C3A has the fastest hydration speed and the large amount of adsorption. Sidaa darteed, a large amount of water reducing agent is adsorbed first.Compared with the low C3A content, the cement with high C3A content has more adsorbent water reducing agent under the same water reducing agent and the same dosage.It will inevitably affect the amount of dispersant required for other minerals (C3S, C2S, C4AF, iwm.) in the cement slurry system, thus showing poor fluidity of the concrete.For this reason, if the amount of the water reducing agent is appropriately increased for the cement having a high C3A content, it is possible to greatly improve the fluidity.

Marka shiida shamiintada, xaddi go'an oo gypsum ah ayaa guud ahaan lagu daraa si wadajir ah, iyo halkan, gypsum waxaa loo isticmaalaa sidii wakiilka dejinta sibidhka, qayb ka mid ah gypsum-ka fuuq-baxa ayaa la saaraa si loogu beddelo biyaha qayb ka mid ah gypsum hemihydrate, ama dhammaan biyaha kristanta ah waa la saaraa si loogu beddelo anhydrite. Intaa waxaa dheer, si loo badbaadiyo kharashka wax soo saarka, Qaar ka mid ah dhirta sibidhka waxay inta badan isticmaalaan anhydrite ama gypsum-ka-soo-saarka warshadaha (sidoo kale gypsum anhydrous) Si kastaba ha ahaatee, haddii sibidhka la soo saaro lagu tijaabiyo si waafaqsan heerarka sibidhka ee khuseeya, farqiga guud ma weyna. Si kastaba ha ahaatee, marka wakiilka biyaha dhimaya lagu daro, Mararka qaarkood waxa laga yaabaa inay yeelato saamayn balaastiig ah oo ka duwan, Midda ugu caansan ayaa ah in marka sibidhka leh gypsum anhydrous sida xinjirowga ah uu ku dhaco kaalshiyamka alwaax iyo sonkorta kaalshiyamka biyaha yareeya., iswaafajin la'aan halis ah ayaa dhici doonta.Ma aha oo kaliya ma gaadho saamaynta dhimista biyaha ee la doonayo, laakiin sidoo kale waxay badanaa keentaa luminta dheecaanka xad dhaafka ah ama uumiga aan caadiga ahayn.

Marka maadada gypsum ee ku jirta sibidhka ay korodho, barta dherjinta ee wakiilka biyaha dhimaya ayaa si joogto ah hoos ugu dhacaya, iyo heerka socodka qulqulka qulqulka ee barta dheriga ayaa si joogto ah hoos ugu dhacda. Farsamaynta ayaa ah in gypsum iyo C3A ay sameeyaan ettringite si ay u daboolaan dusha sare ee qaybaha C3A, ka hortagga C3A inuu sii fuuqbaxo, si sulfate-ku waxa uu wanaajin karaa iswaafajinta walaxda yaraynta biyaha iyo sibidhka. Si kastaba ha ahaatee, Maadada sulfate-ka sare waxay saameyn xun ku leedahay shubka, suurtagalna maaha in lagu daro xaddi badan oo sulfate ah si loo hagaajiyo iswaafajinta.

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