Cov yam ntxwv tseem ceeb ntawm Drymix mortar

Drymix Mortar yog qhov siv dav tshaj plaws thiab yog ib qho ntawm cov khoom siv tseem ceeb hauv kev tsim kho niaj hnub no. Nws yog tsim los ntawm cement, xuab zeb thiab admixtures. Cement yog cov khoom siv cementing tseem ceeb. Niaj hnub no cia peb kawm paub ntau ntxiv txog cov yam ntxwv tseem ceeb ntawm drymix mortar.

Kev tsim kho mortar: Nws yog cov khoom siv tsim los ntawm cov khoom siv cementing, nplua aggregate, admixture thiab dej nyob rau hauv kom zoo proportions.

Masonry mortar: Lub mortar uas khi cib, pob zeb, blocks, thiab lwm yam rau hauv masonry yog hu ua masonry mortar. Masonry mortar plays lub luag haujlwm ntawm cementing blocks thiab xa cov load, thiab yog ib feem tseem ceeb ntawm masonry.

1. Cov khoom sib xyaw ntawm masonry mortar

(1) Cov khoom siv cementing thiab admixture

Cov khoom siv cementing feem ntau siv rau hauv cov cement mortar muaj xws li cov cement, txiv qaub paste, thiab lub tsev gypsum.

Lub zog qib ntawm cov cement siv rau masonry mortar yuav tsum raug xaiv raws li cov qauv tsim. Lub zog qib ntawm cov cement siv hauv cov cement mortar yuav tsum tsis txhob siab dua 32.5; Lub zog qib ntawm cov cement siv hauv cov cement sib xyaw mortar yuav tsum tsis txhob siab dua 42.5.

Txhawm rau txhim kho kev ua haujlwm ntawm mortar thiab txo qis ntawm cov cement, qee cov txiv qaub muab tshuaj, av nplaum los yog cov hmoov tshauv feem ntau sib xyaw rau hauv cov cement mortar, thiab mortar npaj ua li no hu ua cement mix mortar. Cov ntaub ntawv no yuav tsum tsis txhob muaj cov khoom tsis zoo uas cuam tshuam rau kev ua haujlwm ntawm cov tshuaj khib, thiab thaum lawv muaj cov khoom siv los yog agglomerates, lawv yuav tsum tau lim nrog 3 hli square qhov sieve. Slaked txiv qaub hmoov yuav tsum tsis txhob siv ncaj qha rau hauv masonry mortar.

(2) Fine aggregate

Cov xuab zeb siv rau masonry mortar yuav tsum yog cov xuab zeb nruab nrab, thiab cov pob zeb tawg yuav tsum yog cov xuab zeb ntxhib. Cov av nkos ntawm cov xuab zeb yuav tsum tsis pub tshaj 5%. Rau cov cement-mixed mortar nrog qib siab ntawm M2.5, cov av nkos ntawm cov xuab zeb yuav tsum tsis pub tshaj 10%.

(3) Kev xav tau rau cov khoom siv ntxiv

Zoo li qhov sib ntxiv ntawm cov khoom sib xyaw hauv pob zeb, txhawm rau txhim kho qee yam khoom ntawm mortar, admixtures xws li plasticizing, thaum ntxov zog,cellulose ether, antifreeze, thiab retarding kuj yuav ntxiv. Feem ntau, inorganic admixtures yuav tsum tau siv, thiab lawv hom thiab ntau npaum li cas yuav tsum tau txiav txim los ntawm kev sim.

(4) Cov kev xav tau rau cov dej khib nyiab yog tib yam li cov pob zeb.

2. Cov khoom siv ntawm masonry mortar sib tov

(1) Fluidity ntawm mortar

Qhov kev ua tau zoo ntawm mortar ntws nyob rau hauv nws tus kheej qhov hnyav lossis lub zog sab nraud yog hu ua fluidity ntawm mortar, kuj hu ua qhov sib xws. Qhov Performance index qhia qhov fluidity ntawm lub mortar yog lub dab dej, uas yog ntsuas los ntawm ib tug mortar sib xws meter, thiab nws chav tsev yog mm. Kev xaiv ntawm mortar sib xws hauv qhov project yog raws li hom masonry thiab kev tsim kho huab cua, uas tuaj yeem xaiv los ntawm kev xa mus rau Table 5-1 ("Code for Construction and Acceptance of Masonry Engineering" (GB51203-1998)).

Cov yam ntxwv uas cuam tshuam rau qhov dej ntawm cov tshuaj khib nyiab yog: cov dej siv ntawm cov tshuaj khib nyiab, hom thiab cov khoom siv cementitious, cov duab puab thiab gradation ntawm aggregate, xwm thiab ntau npaum li cas ntawm admixture, uniformity ntawm nws, thiab lwm yam.

(2) Kev tuav dej ntawm mortar

Thaum lub sij hawm kev thauj mus los, chaw nres tsheb thiab siv cov mortar sib xyaw, nws tiv thaiv kev sib cais ntawm cov dej thiab cov khoom siv, nruab nrab ntawm cov slurry zoo thiab aggregate, thiab lub peev xwm khaws dej yog cov dej khaws cia ntawm mortar. Ntxiv qhov tsim nyog ntawm microfoam lossis plasticizer tuaj yeem txhim kho cov dej tuav thiab dej ntawm cov tshuaj khib nyiab. Cov dej tuav ntawm mortar yog ntsuas los ntawm mortar delamination meter, thiab yog qhia los ntawm delamination (. Yog hais tias lub delamination loj heev, nws txhais tau hais tias lub mortar yog nquag delamination thiab segregation, uas yog tsis conducive rau kev tsim kho thiab cement hardening. delamination degree ntawm masonry mortar yuav tsum tsis txhob ntau tshaj 3 0mm Yog hais tias lub delamination yog me me heev, qhuav shrinkage tawg yog nquag tshwm sim, yog li lub delamination ntawm mortar yuav tsum tsis txhob tsawg tshaj li 10 hli.

(3) Teem sijhawm

Lub sijhawm teeb tsa ntawm lub tsev mortar yuav tsum raug soj ntsuam raws li kev nkag mus rau qhov siab txog 0.5MPa. Cov cement mortar yuav tsum tsis pub tshaj 8 teev, thiab cov cement sib xyaw mortar yuav tsum tsis pub tshaj 10 teev. Tom qab ntxiv cov tshuaj sib tov, nws yuav tsum ua kom tau raws li cov qauv tsim thiab kev tsim kho.

3. Cov khoom siv ntawm masonry mortar tom qab hardening

Lub zog compressive ntawm lub mortar yog siv raws li nws lub zog Performance index. Tus qauv qauv loj yog 70.7 hli cubic specimens, ib pawg ntawm 6 tus qauv, thiab cov qauv kab lis kev cai yog mus txog 28 hnub, thiab qhov nruab nrab compressive zog (MPa) yog ntsuas. Masonry mortar muab faib ua rau qib zog raws li lub zog compressive: M20, M15, M7.5, M5.0, thiab M2.5. Lub zog ntawm mortar tsis yog tsuas yog cuam tshuam los ntawm qhov muaj pes tsawg leeg thiab kev faib ua feem ntawm mortar nws tus kheej, tab sis kuj muaj feem xyuam rau cov dej nqus dej ntawm lub hauv paus.

Rau cov cement mortar, cov qauv hauv qab no tuaj yeem siv los kwv yees:

(1) Non-absorbent puag (xws li pob zeb ntom)

Lub hauv paus tsis nqus dej yog qhov tseem ceeb cuam tshuam rau lub zog ntawm mortar, uas yog qhov pib zoo ib yam li cov pob zeb, uas yog, nws tau txiav txim siab los ntawm cov cement zog thiab dej-cement piv.

(2) Dej-absorbing puag (xws li av nplaum cib thiab lwm yam khoom ntxeem tau)

Qhov no yog vim lub hauv paus txheej tuaj yeem nqus dej. Thaum nws nqus dej, cov dej khaws cia hauv lub mortar yog nyob ntawm nws tus kheej tuav dej, thiab tsis muaj qhov sib piv ntawm dej-cement. Yog li ntawd, lub zog ntawm mortar nyob rau lub sijhawm no feem ntau yog txiav txim siab los ntawm lub zog ntawm cov cement thiab tus nqi ntawm cov cement.

Bond zog ntawm masonry mortar

Lub masonry mortar yuav tsum muaj lub zog cohesive txaus los khi cov masonry rau hauv ib qho khoom tag nrho. Qhov loj ntawm lub zog cohesive ntawm lub mortar yuav cuam tshuam rau lub zog shear, durability, stability thiab kev co kuj ntawm lub masonry. Feem ntau, lub zog cohesive nce nrog qhov nce ntawm lub zog compressive ntawm cov tshuaj khib. Lub cohesion ntawm mortar kuj muaj feem xyuam rau lub xeev nto, degree ntawm ntub dej thiab curing tej yam kev mob ntawm masonry cov ntaub ntawv.