June 15, 2013
Sɛ wode dade nhama ka mfiridwuma mu fam a, ɛmma ɛnyɛ mpaapaemu. Slab bun, joint spacing ne forklift point loads yɛ akontabuo mmiɛnsa a ɛsono emu biara, na emu baako pɛ na ɛfa fiber no ho.
Nneɛma anum nti na mfiridwuma fam mu paapae: plastic a ɛtwetwe, drying shrinkage, ɔhyew mu nhyɛso, subgrade settlement ne overload. Dade nhama ma abien a edi kan no tu mpɔn kɛse, ɛboa nea ɛto so abiɛsa no fã bi pɛ, na ɛkame ayɛ sɛ ɛnyɛ hwee mma abien a etwa to no. Sɛ fam bi da mpaapaemu adi wɔ asram abiɛsa akyi wɔ bere a wɔde asi hɔ akyi a, nea ɛde ba no taa yɛ nea ɛde ba ne subgrade compaction a ɛnsɛ anaasɛ nkwaa ntam kwan a ɛsõ dodo sen sɛ wɔbɛma dodow a ɛnnɔɔso. Fiber a wɔbɛfa no sɛ amansan nyinaa aduru a ɛko tia mpaapaemu no ne adwene mu mfiase a wɔtaa yɛ ma fam a adi nkogu. Asɛm a ɛyɛ nokware ne sɛ nhama dan mpaapaemu biako a ɛtrɛw ma ɛyɛ mpaapaemu pii wɔ nhwi mu, na ɛma ɔbotan no gyae nhyɛso a ɛma ɛtwetwe no pɛpɛɛpɛ sen sɛ ɛbɛbɔ mmɔden sɛ ebeyi mpaapaemu afi hɔ denam dodow a wɔde ma nkutoo so.
Fam a wɔanhyɛ no den no nya ne tumi a ɛbɔ no fi ne kɛse mu; ne fiber, tumi fi thickness a wɔaka abom ne post-crack tensile ahoɔden. Thinning yɛ theoretically possible nanso ɛhwehwɛ tebea abiɛsa prɛko pɛ: modulus a ɛkorɔn na ɛyɛ pɛ a ɛfa subgrade reaction ho, adesoa a ɛwɔ design values mu, ne load transfer a wotumi de ho to so wɔ joints. Adeyɛ ma 200 mm so tew kɔ 150 anaa 170 mm bere a ɛma dodow a wɔde ma no kɔ soro kodu 35-45 kg/m3. Biribiara a ɛboro 25% a wɔbɛtew so no hia slab check a edi mũ, ɛnyɛ mmara a wɔde di dwuma. Ɛnyɛ den sɛ wobɛpa asɛm biako: dodow a ɔbotan no yɛ tratraa no, dodow no ara na ɛyɛ mmerɛw sɛ ɛbɛbrɛ nea ɛyɛ tratraa ase. 5 mm deviation wɔ 3 m straightedge ase no mfa ho wɔ 200 mm na ɛde local voids ba wɔ 150 mm.
Nkwaa ntam kwan a ɛda ntam no di nhyɛso a ɛba nkwaa so no so. Wɔtaa de kɔnkrit a ɛnyɛ den gu nnua a ne kɛse yɛ mita 6 mu; sɛ wɔde dade nhama di dwuma a eyi betumi anyin akodu mita 8 anaa mpo 10 efisɛ nhama no ma nhyɛso a etwa to a ɛtwetwe ade no kɔ soro. Ntrɛwmu a wɔbɛma ayɛ kɛse no wɔ tebea bi a edi kan: ɛsɛ sɛ nea wɔde saw atwa no mu dɔ du slab no mu duru nkyem abiɛsa mu biako, na ɛsɛ sɛ twa no ba bere a kɔnkrit no anya ahoɔden a ɛdɔɔso akyi nanso ansa na mpaapaemu a ɛtwetwe no bɛda adi, mpɛn pii no nnɔnhwerew 12 kosi 24 wɔ bere a wɔahwie agu kɛse akyi. Twitwa akyiri na slab no mu apaapae dedaw wɔ baabi a ɛpɛ, enti saw a wɔatwa no nyɛ hwee. Ade foforo a wobu ani gu so ne dowel ntam kwan: ma panels no yɛ kɛse bere a woma dowels no yɛ mm 300 na nkwaa no bɛyɛ mfomso.
Fam ne structural concrete de dosage di dwuma wɔ ɔkwan soronko so. Structural concrete gyina benkum ne impact ano wɔ 30 kosi 80 kg/m3; fam no gyina shrinkage ne point loads ano, baabi a 20 kosi 40 kg/m3 ma mpaapaemu suban tu mpɔn dedaw na fam a emu yɛ duru kɔ bɛyɛ 45. Bɛboro 50 kg/m3 a wɔde wie no bɛyɛ den kɛse na ɛda adi sɛ nhama a ɛwɔ soro no kɔ soro. Saa dodoɔ no ne bɛyɛ 0.25% kɔsi 0.5% wɔ dodoɔ mu, a ɛyɛ dodoɔ korɔ no ara a wɔkyerɛw no akwan mmienu so. Bere nyinaa siesie nnyinaso no wɔ nsɛm a wɔafa aka no mu, anyɛ saa a, ɛte sɛ nea ne bo yɛ mmerɛw wɔ volume fraction mu na ne bo yɛ den wɔ kilogram mu ma ade koro no ara.
Fam a wogye tom no kata petee a ɛyɛ petee, mpɛn pii no FF/FL anaasɛ 3 m straightedge, ne sɛnea ɛte wɔ soro no so. Dosage a ɛkɔ soro, slump kɛse ne late finishing nyinaa pia fiber kɔ soro na ɛma whiskers. Fix no nyɛ fiber kakraa bi na mmom controls abiɛsa: ma slump kɔ so yɛ 140 kosi 180 mm, fi ase tumi floating ntɛm ara wɔ vibration akyi, na dry-wosow hardener wɔ baabi a ɛho hia. Wobetumi ayam nhama a ɛda adi dedaw no asan, nanso sɛ wɔyam bɛboro mm 3 a, eyi nea asɛe no fã bi fi hɔ. Wɔ adekoradan a wɔde afiri yɛ a ɛhwehwɛ sɛ ɛyɛ petee kɛse a, fa dodow a wɔde ma no to 30 kg/m3 anaa nea ennu saa na wopɛ 0.55 mm fiber fiber.
Adesoa a wobu no adesoa kɛse wɔ mfiridwuma fam ne forklift. Lɔre a emu duru yɛ t 3 a adesoa a edi mũ ka ho no fa ntwahonan anan mu, enti ntwahonan biako tumi fa t 4 kosi 6 wɔ sɛntimita ahinanan dumien kakraa bi so. Mpɛn pii no, mpɔtam hɔ benkum a efi saa adesoa no mu no boro nkɛntɛnso a adesoa a ɛyɛ pɛ no nya no so. Racking yɛ nea ɛtra so kɛse: anan a ɛteɛ wɔ bay biara mu, a wɔayɛ emu biara ama bɛboro t 10. Enti ɛsɛ sɛ wɔhwɛ sɛnea wɔahyɛ no den ne dodow a wɔde ma no de toto point load a enye koraa no ho, na ɛnyɛ sɛ wɔkyekyem pɛpɛɛpɛ a, service load no. Ɛno nti na adekoradan fam a wɔde afiri yɛ no bo boro 30% sen sotɔɔ a ɛyɛ tratraa a wɔtaa de di dwuma wɔ beae koro no ara no.
Ntease a ɛnteɛ a ɛtaa ba wɔ mfiridwuma fam ne sɛ wobebu dade nhama sɛ nea enti a ɛsɛ sɛ wohuw saw a wɔatwitwa so. Fiber ma mpaapaemu akyi tumi ne denden kɔ soro, ɛma mpaapaemu yɛ fɛ, ɛyɛ den na ɛyɛ brɛoo sɛ wobebue, nanso ɛnsiw kɔnkrit kwan sɛ ɛbɛtwetwe, enti ɛsɛ sɛ wɔda so ara twa nkwaa biara a wɔhwehwɛ. Adeyɛ a wɔtaa yɛ ne sɛ wɔde saw twa wɔ adum no so wɔ bɛyɛ mita asia ntam, a emu dɔ yɛ ɔbotan no mu nkyem anan mu biako; shalower mma mpaapaemu no mma na emu dɔ no ma ɔfã no yɛ mmerɛw. Nkwaa a wɔatew wɔn ho no yɛ nea atwa adum, ɔfasu ntwea ne nnwinnade nnyinaso ho ahyia, baabi a ahohyɛso no yɛ kɛse na nhama dodow biara ntumi ntua ka. Ade biako werɛ fi daa: ɛsɛ sɛ wɔtew ɔbotan no fi abɔnten afasu ne fam nnua ho, anyɛ saa a ɔfasu no siw ɔbotan no ano, sɛnea wɔatwa no nyinaa sesa na mpaapaemu no da adi wɔ kar kwan bi mfinimfini. Dry-shake hardener hia n’ankasa akwankyerɛ. Wɔbɔ aggregate no ho dawuru ansa na wɔde ahyɛ 3 kosi 5 kg/m2 mfiase no; ntɛm dodo na ɛmem, akyiri dodo na ɛrenkyekyere. Forklift point load yɛ dimension a ɛyɛ soronko. Fiber ma punching tumi tu mpɔn, nanso slab thickness wɔ concentrated wheel loads ase no, wontumi mfa dodow a wɔde ma no ntɔ bio; 150 mm bɛn anohyeto a ɛwɔ lɔre a emu duru yɛ tɔn anum ase dedaw, na biribiara a ɛyɛ tratraa no hia mpɔtam hɔ ma ɛyɛ den anaasɛ dade mprɛte. Fam di nkonim anaasɛ di nkogu wɔ nkwaa nhyehyɛe, sub-base flatness ne nnanson a edi kan a wɔde sa yare no so koraa sen dodow a wɔatintim wɔ bag no so.
Dade nhama ho nsɛmmisa ma fam nya nsɛm a wɔde toto ho bere a ɛka nneɛma anum: slab kɛse ne panel kɛse, design adesoa (uniform plus maximum point load), subgrade type ne modulus of subgrade reaction, dosage anaa volume fraction, ne gyinapɛn a ɛsɛ sɛ wodi ho dwuma. Ɛsɛ sɛ nnwuma a wɔde kɔ amannɔne no to din ASTM A820 anaa EN 14889-1. Ade a ɛtaa yera ne modulus of subgrade reaction, na ɛno pɛpɛɛpɛ na ɛkyerɛ sɛ ebia slab no betumi ayɛ tratraa anaa. Sɛnea ɛbɛyɛ na wɔahwɛ adwuma no dodow ho nyansahyɛ ahorow ankasa ne nea wɔde kyekyere nneɛma no, mfiridwuma fam ɔfã a ɛwɔ dade nhama a wɔde yɛ nneɛma kratafa no so no kyerɛw dodow a wɔkamfo kyerɛ ne nneɛma akɛse a ɛdannan tẽẽ kɔ nsukorade dodow mu.
Ka wo project scenario ne ahwehwɛdeɛ kyerɛ yɛn, na yɛbɛma ano aduru a ɛfata no ahyia na yɛde quote ama wɔ nnɔnhwereɛ 24 ntam.
Nya Quote a Wɔde Ma KwaKɔbere-plated microwire, awɔw twetwe hook awiei type, glued wɔ row, fam type, 304 / 310S / 446 stainless dade ne melt-twe ɔhyew-resistant fiber, UHPC soronko synthetic fiber, diameter 0.2 kosi 1.0 mm, tenten 6 kosi 60 mm, tensile ahoɔden 700 kosi 2850 MPa, emu nsɛm coverage 0.5% kɔsi 2% volume rate ne 30 kɔsi 268 kg/m3. Wobetumi ayɛ nhyehyɛe a wɔbɛyɛ no sɛnea ASTM A820 anaa EN 14889-1 kyerɛ na wobetumi de batch inspection amanneɛbɔ ama. Wɔboa nneɛma a wɔde kyekyere nneɛma ahorow abiɛsa: nnaka, ton bag ne bulk. Aguadi ho nsɛm yɛ nea wobetumi apaw EXW / FOB / CIF / DDP.
Sua dade nhama a wɔpaw ne nsɛm a wɔafa aka ho ade →