Quantitative Relationship ntawm Nto Roughness ntawm Rail Spikes thiab Bond Strength ntawm Anchoring Agents
Yuav ua li cas kom muaj nuj nqis kev sib raug zoo ntawm spike nto roughness thiab anchoring tus neeg sawv cev lub zog?
Txoj kev sib raug zoo ua raws li "parabolic nkhaus": hauv qab tus nqi tseem ceeb, daim ntawv cog lus lub zog nce linearly nrog roughness; Tshaj li qhov tseem ceeb, daim ntawv cog lus lub zog txo nrog nce roughness. Rau cov resin anchoring agents, qhov zoo tshaj plaws deg roughness range yog Ra 12.5-25μm, yielding lub zog ntawm 12-15MPa. Hauv Ra<6.3μm, mechanical interlocking is insufficient, and bond strength drops below 8MPa. At Ra>50μm, qhov sib sib zog nqus grooves ntawm qhov ntsia hlau loj dhau los ua cov ntsiab lus ntawm kev ntxhov siab, ua rau tus neeg sawv cev anchoring tawg thiab txo cov ntawv cog lus kom qis dua 10MPa.
Los ntawm ob lub ntsiab mechanisms puas nto roughness cuam tshuam rau daim ntawv cog lus ntawm spikes thiab anchoring agents?
Nws ua feem ntau los ntawm "txoj kev sib cuam tshuam cov tshuab" thiab thib ob los ntawm "interfacial adsorption mechanism." Mechanical interlocking yog qhov tseem ceeb: lub ncov -kub qauv ntawm qhov ntxhib nto interlocks nrog cov kho anchoring tus neeg sawv cev matrix, tsim cov tshuab ntsuas phoo uas tiv thaiv lub zog tensile. Interfacial adsorption yog pab: ntau dua roughness ua rau thaj chaw sib cuag, txhim kho van der Waals rog thiab tshuaj sib txuas ntawm cov molecules. Cov txheej txheem no ua haujlwm sib koom ua ke los tsim tag nrho daim ntawv cog lus lub zog ntawm lub pob zeb loj. Cov npoo du tsis muaj qhov ntsuas qhov ntsuas thiab tso siab rau qhov adsorption nkaus xwb, ua rau lawv yooj yim rau kev co-vim ua tsis tiav.
Puas muaj ntau hom anchoring agents muaj tib qhov kev pom zoo ntawm qhov chaw roughness rau spikes?
Tsis yog, qhov no nyob ntawm tus neeg saib xyuas cov khoom siv matrix thiab cov yam ntxwv kho. Sulfur mortar, ib qho khoom siv hauv cov cementitious inorganic nrog siab brittleness, muaj qhov dav roughness kam rau ua, nrog rau kev pom Ra ntau ntawm 25-50μm, tso cai rau cov grooves sib sib zog nqus los txhim kho kev sib tshuam. Resin anchoring agents, organic polymers nrog zoo toughness tab sis rhiab heev rau cov ces kaum ntse, yuav tsum tau ib tug zoo Ra range ntawm 12.5-25μm nrog "puag ntxhib peaks" kom tsis txhob muaj kev ntxhov siab concentration los ntawm ntse burrs. Spike manufacturers yuav tsum tau kho knurling los yog sandblasting tsis raws li qhov project xaiv anchoring neeg sawv cev.
Yuav ua li cas spike nto kho cov txheej txheem (piv txwv li, knurling, sandblasting) ua tiav qib sib txawv roughness?
Knurling cov ntaub ntawv tsis tu ncua ncaj los yog hla cov qauv ntawm lub shank ntawm kev siv tshuab extrusion, feem ntau kho macro-roughness kom ua tiav Ra 25-100μm, haum rau sulfur mortar anchoring. Sandblasting tsim tsis tu ncua micro- qhov chaw ntawm lub shank ntawm siab - ceev xuab zeb cuam tshuam, feem ntau kho micro-roughness kom ua tiav Ra 3.2-25μm, haum rau resin anchoring. Rau siab - cov kev xav tau precision, "sandblasting + knurling" txheej txheem sib xyaw yog siv: nplua sandblasting rau saum cov qauv knurling sib npaug macro-locking thiab micro-adsorption.
Yuav tshawb xyuas sai npaum li cas ntawm -qhov chaw seb puas muaj qhov sib txawv ntawm qhov roughness ua tau raws li cov qauv tsim?
Txoj kev yooj yim tshaj plaws yog siv "surface roughness comparison blocks," ib txheej ntawm cov hlau thaiv nrog tus qauv Ra qhov tseem ceeb. Thaum lub sij hawm soj ntsuam, pom thiab tactilely sib piv cov spike shank nrog cov blocks sai sai txiav txim siab roughness qib raws li kev ntxhib los mos qhov tob thiab tactile xav. Rau cov resin-anchored spikes nrog siab precision, siv lub portable nto roughness tester ncaj qha ntsuas Ra ntawm lub shank. Ntsuas peb qhov sib txawv -sections thiab coj qhov nruab nrab raws li qhov kawg tshwm sim. Tshem tawm thiab rov qab spikes nrog substandard roughness rau reprocessing.