June 15, 2012
Wɔ ne kɛse ne ne tenten koro no ara mu no, nhama a wɔde hama abɔ n’awiei abien no nyinaa nya nkitahodi bɛyɛ 40% sen nea ɛyɛ tẽẽ. Hook no dan friction interface kɔ friction ne mfiri anchorage.
Sɛ wotwe dade nhama fi kɔnkrit mu a, ɛkyerɛ sɛ wubedi nneɛma abien so: ntamgyinafo a ɛbɔ ne mfiri a ɛka bom. Fiber a ɛyɛ tẽẽ no wɔ friction nkutoo, enti efi ase hwe ase wɔ nhyɛso a ɛba fam mu. Ɛsɛ sɛ nhama a wɔde hama abɔ n’afã abien no nyinaa di kan teɛteɛ ne nhama bere a ɛrehwe ase no, na ɛno gye ahoɔden foforo, enti wɔ twe a ɛtwe fi baabi koro no ara mu no, ɛsoa adesoa pii. Ɛno ne ahintasɛm no nyinaa: hama no dan friction interface ma ɛbɛyɛ friction plus anchorage. Ɛsan nso kyerɛ hook geometry, a ɛkyerɛ hook tenten, anim ne radius, ɛho hia sen fiber diameter, na geometry yɛ nea ade a ne bo nyɛ den yi fi mu pɛpɛɛpɛ.
Ka a wɔka sɛ hooked fiber bonds bɛyɛ 40% yie sen straight fiber yɛ pull-out sɔhwɛ aba, ɛnyɛ aguadi. Wɔ matrix koro no ara mu wɔ embedment koro no ara mu no, nhama a ɛyɛ tẽẽ bi kɔ soro wɔ bɛyɛ milimita biako a ɛtwetwe na afei ɛkɔ fam denneennen, bere a nhama a wɔde hama abɔ no kɔ soro na ɛsiane brɛoo. Sɛ obi sian brɛoo a, ɛkyerɛ sɛ ahoɔden pii a wɔtwe ansa na adi huammɔ, a wɔ beae hɔ no, ɛkenkan sɛ emu apaapae nanso egyina hɔ. Ɛno nti na ɛkame ayɛ sɛ tunnel shotcrete, adwuma a ɛko tia ɔtopae ne nneɛma a ɛma asasewosow no de nhama a wɔde abɔ ho nkutoo na edi dwuma: wohia deformation tumi ansa na adi nkogu, na ɛnyɛ ahoɔden a ɛkorɔn a wɔde mia.
Diameters abiɛsa, nnwuma abiɛsa. Wɔ 0.55 mm mu no fiber no yɛ fɛ yiye ma aspect ratios a ɛboro 60, a ɛfata afasu a ɛyɛ tratraa, afrafra a ɛyɛ ne ho a ɛyɛ den ne dodow a ɛkɔ soro. Wɔ 0.75 mm no ɛyɛ general-purpose grade ma fam, bridge deck overlays ne precast beams. Wɔ 1.0 mm mu no ɛsoa adesoa kɛse wɔ fiber biara mu, ma mass pours, heavy-duty floors ne cases a wɔresesa bar a ɛyɛ den. Mmara no nyɛ thicker na eye nanso pefee spacing: fiber tenten ɛsɛ sɛ tra ase bɛyɛ nkyem abiɛsa mu abien wɔ minimum clear kwan no, anyɛ saa a fibers bridge ne arch bere a wɔde si hɔ. Wɔ 150 mm slab a ɛwɔ soro ne ase ahama so no, ntam kwan a ɛda adi pefee taa yɛ mm 60 kosi 80 pɛ, baabi a 50 mm tenten 0.75 mm nhama yɛ adwuma yiye sen 60 mm tenten 1.0 mm nhama.
Tenten nyɛ ade a obi ankasa paw. Sɛ wɔde mm 20 a wɔaboaboa ano kɛse a, nhama tenten taa yɛ mm 30 kosi 40; ase 10 mm aggregate betumi akɔ 50 anaa 60 mm. Nea enti a ɛte saa no yɛ tiawa: ɛsɛ sɛ nhama bi kɛse bɛyɛ nea wɔaka abom mmɔho abiɛsa na ama asiw nneɛma nketenkete no ntam, nanso sɛ ɛnkɔ ntam bio a, ɛyɛ bɔɔl. Shotcrete ne nea ɛyɛ soronko. Ɛsɛ sɛ nhama a ɛwɔ nozzle no so no ne mframa a ɛretu no hwe ase, enti mm 20 kosi 30 yɛ ade a ɛfata; fiber a ɛware no ma rebound yɛ kɛse wɔ ɔkwan a wotumi hu so.
Nhama a mframa bɔne nnim a wɔtwe awɔw wom no nya ahoɔden denam adwuma a ɛma ɛyɛ den so. Poma no twa bɛboro du a ɛtoatoa so wu, aburow tenten na ɛyɛ foforo wɔ axis no so, ahoɔden foro bere biara a ɛtwam na ductility hwe ase. Ntwam kakraa bi dodo na ahoɔden ntumi mma da; pii dodo a enni mfinimfini annealing na waya no dan brittle na ɛpaapae bere a wɔabɔ no mprɛnsa akyi. Ntrɛwmu a ɛyɛ den kura ahoɔden nsakrae a ɛba fam 5% na ɛma awerɛhyem sɛ ɛremmubu wɔ akyi a wɔabɔ no mprɛnsa akyi. Saa akontaahyɛde abien no ka pii fa nhyehyɛe a wɔde di dwuma ho sen ahoɔden a wɔfrɛ no, efisɛ ɛkyerɛ sɛnea abubu dodow bere a wɔrefrafra no. Nhama a abubu sɛe nneɛma na ɛma nnua ntiantiaa a wɔmfa nhyɛ mu a enhyɛ biribiara den.
Dade nhama betumi asi welded mesh ananmu nanso ɛnyɛ structure reinforcement, na ɛsɛ sɛ wɔka line no pefee. Mesh na ɛhwɛ ɔhyew ne shrinkage mpaapaemu so, a ɛyɛ ahoɔden a ɛto so abien; dade nhama a ɛwɔ dodow a ɛyɛ pɛ mu no ma ahoɔden a eye sen biara wɔ afã abiɛsa na eyi kyekyere, ntam kwan ne gyinabea adwuma fi hɔ. Nanso main tension steel a ɛwɔ beams, columns ne slab soffits mu no ntumi nyi, efisɛ randomly oriented fiber no nyɛ adwuma yiye koraa sen oriented bar. Nea wɔtaa yɛ ne sɛ wɔde nhama besi soro ahama no ananmu, de dade titiriw a ɛwɔ ase no akɔ so, anaasɛ wɔbɛtew dua no ntwemu so milimita biako anaa abien wɔ 30 kosi 80 kg/m3 dodow a wɔde ma no nkyɛn.
Nhama a wɔde nhama abɔ mu na ɛkura dade nhama a wɔde yɛ adan no gua no fã kɛse no ara, nanso hama ne nhama a wɔde hyɛ mu nyɛ ade koro. Nneyɛe abiɛsa na ɛsiesie no wɔ beaeɛ hɔ anaa wɔ nhwɛsoɔ dan no mu. Nea edi kan no, kotow: fa nhama du, fa pliers teɛteɛ ahama bi na gyae, na ɛsɛ sɛ hama no san fi hɔ kɔ bɛboro ne mfitiase kwan no fã. Spring-back a enye kyerɛ sɛ waya no wɔ yield-to-tensile ratio a ɛkorɔn dodo, enti hook no teɛ wɔ mixer no mu na ɛhyɛn kɔnkrit no mu sɛ waya a ɛnyɛ den. Nea ɛto so abien, susuw: mpɛn pii no, hama tenten yɛ waya no ntwemu mmɔho abien kosi abiɛsa, anim no yɛ digrii 45 anaa 90, na n’awiei abien no nyinaa betumi ahwɛ ɔkwan koro so anaasɛ akwan a ɛne ne ho bɔ abira, nanso ɛsɛ sɛ batch bi yɛ pɛpɛɛpɛ. Caliper nhama du a wɔde yɛ; a ɛtrɛw boro ɔha biara mu du wɔ hama tenten mu no kyerɛ sɛ wɔhyɛ forming dies no. Nea ɛto so abiɛsa, bubu: ductile fiber kɔn mu ansa na apaapae, nea ɛyɛ brittle no paapae, na flat break kyerɛ sɛ ɛnyɛ den sɛ ɛbɛbɔ. Mpɛn pii no, wɔpa asɛm biako a ɛkɔ akyiri. Kɔbere a ɛwɔ so no di kan paapae wɔ baabi a ɛkɔ no, enti dannan hama bi tia kanea no; faint dark hairlines kyerɛ sɛ wɔhyehyɛɛ hama no a wɔansan anhyɛ so na corrosion befi ase wɔ hɔ wɔ nkyene a wɔde petepete so mu. Bere bɛn na hama yɛ nea ɛnteɛ? Wɔ kɔnkrit a wɔde petepete so mu no, nkɔnsɔnkɔnsɔn no kyere mesh na ball kɔ soro bere a aspect ratio no sua dedaw, enti waved wire feeds yiye. Wɔ kɔnkrit a ɛyɛ ne ho a ɛyɛ den mu no, nsu a ɛsen kɛse no twa mfaso a ɛwɔ anchorage no fã bi mu. Selection nyɛ fiber a ɛyɛ den sen biara no ho asɛm, ɛfa nea ɛmma ɔhaw mma wɔ saa kwan a wɔfa so de si hɔ no mu. Sɛ wo ne hooked end steel fiber supplier bi rekasa dedaw a, fa nhama du mena wɔn na bisa spring-back ne break type no ansa na wode adetɔ krataa amena; obi a ɔde nneɛma ma a ontumi mmua wɔ saa nsɛm no mu no retɔn wɔ bo nkutoo so.
Nnwinnade biara a wɔde bɛhwehwɛ nkɔnsɔnkɔnsɔn mu. Nea edi kan no, tow nsa biako gu na tie: mprɛte a ɛhyerɛn kyerɛ sɛ wobɛdum no yiye, nnyigyei a ɛyɛ kusuu kyerɛ waya a ɛyɛ mmerɛw. Nea ɛto so abien no, fa caliper susuw hama tenten ne ne ntwemu wɔ nhama du so; nhama ntiantiaa anaa nea emu nnɔ teɛ ntɛm wɔ adesoa ase. Nea ɛto so abiɛsa no, kotow nhama biako mmɔho abien na kɔ akyi mprɛnsa; sɛ ɛpaapae a, ade no yɛ mmerɛw. Saa anammɔn abiɛsa no akyi no, hwɛ batch amanneɛbɔ no mu hwɛ sɛnea tensile ahoɔden ne diameter tolerance te na wɔayiyi ɔhaw lot dodow no ara afi mu. Sɛ yɛde toto nhwɛsoɔ biara ho a, dadeɛ nhama a wɔde yɛ nneɛma krataafa no kyerɛ ne kɛseɛ, ne tenten, ne kɛseɛ ne ne tensile values a wɔasusu ama grade biara, a ɛbɛtumi ayɛ adwuma tẽẽ sɛ agyedeɛ mfitiaseɛ.
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.
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