Steel Fiber insait long Precast Concrete: Demoulding, Lifting na Tinpela Wol

Stori

Jun 15, 2015

Wanpela 'precast plant' i no laikim bikpela strong, em i laik rausim 'mold' tude. Tripela samting, taim bilong rausim 'moulding', ol 'lifting points' na 'wall thickness', i makim 'fiber'.

Wanem samting wanpela 'Precast Plant' i laikim em long 'strip' tude

Ol 'cast-in-place' sait i save tingim strong bilong en; ol 'precast' diwai i save tingim 'turnover'. Wanpela strip long wan wan de na wanpela long olgeta tupela de i save daunim namba bilong ol samting na senisim hau ol i kisim 'plant depreciation' na 'labour'. Namba wan wok bilong 'steel fiber' insait long 'precast' em long pasim ol 'crack' pastaim na i no long 'ultimate capacity', olsem na ol i ken apim, tanim na rausim wanpela samting taim simen i yangpela yet na i no ken bruk long ol kona. Dispela i tok klia tu long wanem as ol 'precast' diwai i save pilim moa long 'dispersion' na i no long 'tensile strength': wanpela 'fiber ball' inap long rausim kona bilong wanpela samting taim ol i rausim.

Strong na taim bilong rausim klos pastaim

Taim bilong rausim ol samting i bihainim strong bilong pastaim, planti taim 50% i go inap 70% bilong disain. Ol 'steel fiber' i no save apim strong bilong 'compressive' hariap, we em i simen na 'curing', tasol em i save apim 'early tensile strength', we em i 'tolerance' bilong noken bruk o bruk taim yu rausim. Long praktis, wanpela element we i gat 30 i go long 40 kg/m3 bilong 'fiber' ol i ken rausim foapela o 8-pela aua pastaim aninit long wankain 'curing', o ol i ken rausim long wankain de wantaim liklik bagarap long kona. Long ol liklik wol, dispela i bikpela moa yet.

Ol Poin Bilong Liftim: Faiba I No Senisim Ol Lup Bilong Liftim

Wanpela tingting kranki we i nogut tru em olsem 'steel fiber' i save rausim nid bilong ol 'lifting loops'. Taim yu apim samting, dispela i save givim bikpela strong, na simen klostu long dispela hap i stap long 'local bearing' na 'punching shear'. Ol 'fiber' i save mekim strong bilong sutim samting i kamap gutpela moa tasol em i no inap senisim ol 'cast-in loop' o ol hul bilong apim. Holim ol 'lifting point', na mekim ol 'fiber' i kamap strong o putim 'mesh' klostu long ol. Wanpela liklik samting i senis: 'lifting stress field' insait long 'fiber concrete' i wankain, olsem na ol poin i ken sindaun longwe liklik long 'plain concrete', tasol bihain tasol long sekim, na i no long ai.

Ol liklik wol: 0.12-0.3 mm maikro waia tasol i gutpela

Aninit long 60 mm 'wall thickness', ol nomol 'steel fiber' i no inap long fit. Wanpela 50 mm 'fiber' insait long 40 mm wol i karamapim olgeta hap, i no kamapim wanpela 'three-dimensional network', na i save pusim i go antap long taim bilong 'vibration'. Dispela em i hap we 'stainless micro wire' i save wok long en: 0.12 i go long 0.3 mm diamita, 6 i go long 20 mm longpela, 2000 i go long 2850 MPa 'tensile strength'. Maikro waia i save kamapim wanpela strongpela netwok insait long wanpela liklik hap, na i save apim 'crack resistance' na i no bagarapim 'forming accuracy'. Ol samting bilong bilasim haus, ol 'sunshade' na ol liklik UHPC panel olgeta i bilong hia.

Ol 'Glued Bundles': We 40% 'Dispersion Gain' i kam long en

Ol 'loose fiber' i save go insait long miksa long ol liklik hap na i dipen long miksa long brukim ol; wanem samting i no bruk i kamap bal. Ol i save pasim ol 'glued fiber' long wanpela lain longpela bilong en wantaim wanpela 'adhesive' we i save kapsait long wara. Ol i givim kaikai long lain olsem wanpela yunit, glu i kapsait insait long 30 i go inap 60 seken, na olgeta wan wan rop i bruk wanwan. Yunifomiti we ol i skelim em i winim 40% moa long 'loose fiber' na 'balling rate' i go daun tru. Em i kost liklik moa long wan wan tan, tasol long ol liklik wol, bikpela dosis na gutpela simen dispela premium i stap daunbilo tru long kost bilong wanpela panel we ol i sakim.

UHPC na RPC: Bilong wanem tupela kain 'fiber' i save bung wantaim

Ol 'ultra-high performance matrices' i gat bikpela strong tru, wantaim 'aggregate' bilong sampela milimita tasol na liklik tru 'porosity'. Insait long dispela 'matrix' 'steel fiber' i save givim 'post-crack bridging', tasol 'plastic shrinkage cracking' i save kamap pastaim na i nidim wanpela gutpela 'fiber'. Olsem na UHPC i save miksim ain na sintetik faia: ain long 1% i go inap 3% long volium bilong karim hevi, sintetik long 1% i go inap 3% bilong kontrolim 'shrinkage' hariap na long daunim 'explosive spalling' long bikpela hat. Sintetik faiba i gat density bilong 1.41 g/cm3 tasol, i no putim hevi long element, na long 99% alkali resistens i stap gut insait long strongpela alkaline simen matriks.

Ol 'Mould', 'Release Agents' na 'Steam Curing': Tripela hait lus insait long 'precast'

Laip bilong 'mold' long 'steel fiber precast' i sotpela long 30 i go inap 50 pesen long 'plein concrete', long wanpela as tasol: ol 'fiber' i save skrapim wol bilong 'mold' taim ol i guria na rausim 'moulding', na 'hooked wire' i save wok olsem ol liklik 'barbs'. Tripela mak i gat ol samting i bagarap. Namba wan, noken tromoi bikpela mani long 'draft', ating 1 long 20 bilong ol dip hap na 1 long 15 bilong ol liklik wol. Namba tu, makim wanpela 'film-forming release agent' na i no wanpela oil, long wanem, wanpela 'film' i save holim wanpela banis namel long wol na 'paste' taim ol i skrapim oil stret long hap we wanpela 'fiber' i presim em. Namba tri, senisim i go long 'high frequency low amplitude vibration' na putim 'poker' i stap 50 mm long pes bilong 'mold' bai ol 'fiber' i no ken bung long en. Ol 'glued fiber bundles' i gat wanpela gutpela samting long en: sapos yu putim ol 'bundles' insait long ol 'bundles' dispela i no inap long tanim tanim long taim bilong putim, i mekim 'distribution uniformity' i kamap wankain long 40 pesen, na i rausim ol 'local overload' long 'mould'. Steam curing i nidim tempereja disiplin, i no hariap moa long 20 digri Selsias long wanpela aua long 'ramp', holim aninit long 60 digri Selsias, na i mas go daun isi isi wankain. Ol 'overshoot' na ol 'thin section' i save kamapim ol liklik 'surface cracks' we i stap stret long ol 'fiber end', we i save kostim wanpela klas bilong 'impemeability'. Ol i ken bringim 'demoulding' i go het, tasol 'lifting' i no inap: 'fiber' i save helpim 'flexural behavior' na 'toughness', i no 'early compressive strength', olsem na ol 'lifting loops' na 'lifting points' i stap yet. Long wanpela saplaia bilong 'precast concrete steel fiber', gutpela askim em i no prais bilong wan wan tan tasol em i long taim bilong rausim 'moulding' we ol bai raitim long rait bilong 'section thickness' bilong yu, long wanem, dispela namba i makim namba bilong ol 'mold' na tu olgeta prodaksen plen.

Lis bilong ol samting ol i baim long Precast Plant

Baim 'precast' em i moa ditel long baim 'site': 'wall thickness' na 'minimum clear spacing', taim bilong rausim 'stripping', sapos pes i gat stretpela pes, sapos ol i yusim 'steam curing', na sapos EN 14889-1 i nidim long salim i go aut. Steam curing em i samting we planti taim ol i no save tingim: antap long 60 C strong bilong wanpela kopa koting i save bagarap, na 'stainless fiber' i mas kisim namba wan ples. Long makim ol gret na rekomended dose long kain kain element, precast seksen bilong steel faiba prodak pes i listim ol spesifikesen, wantaim diamita na longpela bilong ol glued gred na steinles maikro waia.