Qhuav hmoov mortar yog hais txog cov khoom siv granular lossis hmoov tsim los ntawm lub cev sib xyaw ntawm cov khoom sib xyaw ua ke, cov khoom siv tsis muaj zog cementitious, thiab cov khoom ntxiv uas tau qhuav thiab tshuaj xyuas hauv ib qho kev faib ua feem. Dab tsi yog cov khoom siv feem ntau siv rau cov hmoov qhuav mortar? Cov hauv qab no yog kev qhia txog cov ntsiab lus tseem ceeb ntawm cov hmoov qhuav mortar additives coj los ntawm Jianshe Net rau siv.
Qhuav hmoov mortar feem ntau siv Portland cement raws li cov khoom siv cementitious, thiab cov khoom siv cementitious feem ntau suav rau 20% mus rau 40% ntawm cov hmoov qhuav mortar; Feem ntau cov zoo aggregates yog quartz xuab zeb thiab yuav tsum muaj ntau yam kev kho mob ua ntej xws li ziab thiab tshuaj xyuas kom ntseeg tau tias lawv cov particle loj thiab zoo raws li qhov yuav tsum tau ua ntawm cov mis; Qee lub sij hawm ya tshauv, slag hmoov, thiab lwm yam kuj ntxiv raws li admixtures; Admixtures feem ntau yog siv me me, txij li 1% mus rau 3%, tab sis muaj qhov cuam tshuam loj. Lawv feem ntau raug xaiv raws li qhov yuav tsum tau ua ntawm cov khoom tsim los txhim kho kev ua haujlwm, txheej txheej, lub zog, shrinkage, thiab Frost tsis kam ntawm mortar.
Dab tsi yog hom hmoov qhuav mortar additives?
EVA copolymertuaj yeem txhim kho cov khoom hauv qab no hauv cov hmoov qhuav mortar:
① Kev tuav dej thiab ua haujlwm ntawm cov tshuaj khib nyiab tshiab;
② Kev sib txuas ua haujlwm ntawm cov txheej txheem sib txawv;
③ Kev ua tau zoo thiab deformation ntawm mortar;
④ Khoov lub zog thiab cohesion;
⑤ Hnav tsis kam;
⑥ Kev ua siab ntev;
⑦ Compactness (impermeability).
Daim ntawv thov ntawm redispersible latex hmoov nyob rau hauv nyias txheej plastering mortar, ceramic pobzeb binder, sab nrauv phab ntsa rwb thaiv tsev, thiab nws tus kheej leveling flooring cov ntaub ntawv tau qhia tau zoo.
Water retaining thiab thickening tus neeg sawv cev
Cov dej tuav cov thickeners feem ntau suav nrog cellulose ethers, starch ethers, thiab lwm yam. Cov cellulose ether siv hauv cov hmoov qhuav mortar yog methyl hydroxyethyl cellulose ether (MHEC) thiabhydroxypropyl methyl cellulose ether(HPMC).
Lub luag haujlwm tseem ceeb ntawm cov dej txo cov neeg ua haujlwm yog txhawm rau txo cov dej xav tau ntawm mortar, yog li txhim kho nws lub zog compressive. Cov dej tseem ceeb txo cov neeg ua haujlwm siv hauv cov hmoov qhuav mortar suav nrog casein, naphthalene raws li dej txo tus neeg saib xyuas, melamine formaldehyde condensate, thiab polycarboxylic acid. Casein yog ib tug super Plasticizer nrog kev ua tau zoo heev, tshwj xeeb tshaj yog rau nyias txheej mortar, tab sis vim hais tias nws yog ib tug natural khoom, nws zoo thiab nqi feem ntau hloov. Naphthalene series dej txo cov neeg ua haujlwm feem ntau siv β- Naphthalenesulfonic acid formaldehyde condensate.
Coagulant
Muaj ob hom coagulants: accelerator thiab retarder. Accelerators yog siv los ua kom ceev qhov chaw thiab hardening ntawm mortar, Calcium formate thiab lithium carbonate yog dav siv, thiab Aluminate thiab Sodium metasilicate kuj siv tau los ua accelerators. Retarders yog siv los qeeb qhov teeb tsa thiab hardening ntawm mortar. Tartaric acid, citric acid thiab nws cov ntsev thiab Gluconic acid tau zoo siv.
Tus neeg saib xyuas dej tsis zoo
Tus neeg saib xyuas dej tsis zoo feem ntau suav nrog: Hlau (III) chloride, organic silane compound, fatty acid ntsev, polypropylene fiber, Styrene-butadiene thiab lwm yam macromolecular compounds. Hlau (III) chloride waterproof tus neeg saib xyuas muaj cov nyhuv dej tsis zoo, tab sis nws yog ib qho yooj yim ua rau corrosion ntawm qhov cuab lub zog thiab cov hlau embedded qhov chaw. Cov ntsev tsis muaj calcium uas tsim los ntawm cov tshuaj tiv thaiv ntawm fatty acid ntsev nrog calcium ions nyob rau hauv cov cement theem tso rau ntawm phab ntsa ntawm capillaries, ua lub luag hauj lwm hauv thaiv qhov hws thiab ua rau cov phab ntsa capillary raj ua hydrophobic nto, yog li ua lub luag hauj lwm waterproof. Tus nqi ntawm cov khoom no kuj tsawg, tab sis nws yuav siv sij hawm ntev los sib tov mortar sib npaug nrog dej.
Cov fibers siv rau qhuav hmoov mortar muaj xws li alkali resistant iav fiber ntau, polyethylene fiber (polypropylene fiber), high-strength thiab siab modulus polyvinyl cawv fiber (polyvinyl cawv fiber), ntoo fiber, thiab lwm yam. Cov khoom siv feem ntau yog siv zog thiab high modulus polyvinyl cawv fibers thiab polypropylene fibers. Lub zog siab thiab siab modulus polyvinyl cawv fibers muaj kev ua tau zoo dua thiab tus nqi qis dua li cov khoom siv polypropylene tuaj. Cov fibers tsis tu ncua thiab tsis sib xws hauv cov cement matrix, thiab sib txuas nrog cov cement los tiv thaiv kev tsim thiab kev loj hlob ntawm microcracks, ua rau cov mortar matrix ntom, thiab yog li muaj cov dej tsis zoo thiab muaj kev cuam tshuam zoo heev thiab kev sib tsoo. Qhov ntev yog 3-19 mm.
Post lub sij hawm: Lub Xya hli ntuj-14-2023