Polypropylene Fiber Concrete

Ordinary polypropylene fibers muaj kev laus tsis zoo thiab zoo li tsim cov pawg thaum sib xyaw ua ke. Tsuas yog hloov kho fibers tuaj yeem ua haujlwm ua ke nrog cov cement matrix thiab siv rau hauv kev ua vaj tse pob zeb. Cov ntawv thov thaum ntxov feem ntau siv polypropylene zaj duab xis tawg fibers. Thaum xyoo 1980s, Tebchaws Meskas tau ua tiav kev tsim cov monofilament polypropylene fibers, uas tau siv dav hauv underground waterproofing, industrial and civil building rus, floors, highways, and bridge projects because they low cost and significant improvement in concrete performance. Txij li thaum nruab nrab -1990s, ntau txhiab txoj haujlwm hauv Suav teb tau siv cov khoom siv polypropylene fiber ntau, suav nrog Guangzhou New China Mansion, Chongqing World Trade Center, Beijing Asian Games Village, Wuhan Yangtze River Choj, thiab Peb Txoj Haujlwm Gorges, ua tiav zoo kawg li. tshwm sim.

1. Cov yam ntxwv ntawm Polypropylene Fiber Concrete

Pob zeb muaj qhov kawg tensile hom, feem ntau yog li ntawm {{0}}.01% mus rau 0.20%, hos polypropylene fibers muaj tensile hom txog li 15% mus rau 18%. Polypropylene monofilament fibers sib npaug sib npaug hauv cov pob zeb tsis tsuas yog tiv thaiv kev sib sau ua ke, txhim kho kev ua haujlwm, thiab txo cov ntshav thiab kev sib cais, tab sis kuj muaj txiaj ntsig zoo rau lub zog tensile los ntawm pob zeb shrinkage. Qhov no ncua los yog tiv thaiv qhov tshwm sim thiab kev loj hlob ntawm micro-cracks thiab nto macro-cracks nyob rau hauv pob zeb, yog li pab txhawb nws impermeability. Thaum raug cuam tshuam los ntawm kev thauj khoom, polypropylene fiber ntau pob zeb tiv thaiv kev tawg tawg, txhim kho qhov cuam tshuam, tiv thaiv te, thiab carbonation tsis kam ntawm pob zeb.

1.1 Lub cev muaj zog

Shrinkage Resistance: Shrinkage kuj yog cov cuab yeej tseem ceeb tshaj plaws ntawm polypropylene fibers hauv pob zeb. Cov kev tshawb fawb tau pom tias kev sib koom ua ke ntawm polypropylene zaj duab xis tawg fibers ntawm qhov sib piv ntawm kwv yees li 1% tuaj yeem txo qis qis ntawm pob zeb los ntawm kwv yees li 75%.

Impermeability: Raws li National Building Materials Testing Center, polypropylene fiber ntau pob zeb nrog rau 0.05% ntau npaum li cas muaj 70% siab dua impermeability nyob rau hauv 1.2MPa dej siab piv rau non-polypropylene fiber ntau ntawm tib lub zog ({{6 }} hnub nyoog).

Hluav taws kub tsis kam: Kev ntsuas hluav taws kub tsis ntev los no qhia tau tias ntxiv cov fibers uas tsis tshua muaj melting point (inch 0.1mm, ntev 12cm, ntau npaum li cas 4kg/m³) rau cov pob zeb qhia tau hais tias muaj kev tiv thaiv hluav taws. Xws li fiber ntau pob zeb ua pov thawj yuav luag tsis muaj kev puas tsuaj tom qab kev ntsuas hluav taws kub, tawm tswv yim tias cov fibers uas tsis tshua muaj melting point tuaj yeem tiv thaiv cov pob zeb tawg.

Ua haujlwm tau: Ntxiv polypropylene fibers ntawm qhov ntim piv ntawm {{0}}.05% rau 0.07% tuaj yeem cuam tshuam kev sib cais thiab los ntshav hauv cov pob zeb sib tov, txhim kho kev ua haujlwm.

1.2 Mechanical Properties

Compressive thiab Tensile zog: Lub compressive thiab tensile lub zog ntawm polypropylene fiber ntau pob zeb zoo ib yam li cov pob zeb zoo tib yam.

Flexural zog: Ntxiv polypropylene zaj duab xis tawg fibers ntawm qhov sib piv ntawm li 1% tuaj yeem ua kom lub zog ntawm cov tshuaj khib nyiab lossis pob zeb tsis ntau tshaj 25%, tab sis lub peev xwm deformation ua ntej tsis ua haujlwm siab heev.

Impact Resistance: Kev ntsuam xyuas los ntawm National Building Materials Testing Center qhia tias qhov cuam tshuam lub zog ntawm mortar nrog {{0}}.05% thiab 0.1% fiber ntau cov ntsiab lus yog nce 17.7% thiab 25.8%, feem, piv rau cov mortar dawb.

Fatigue Resistance: Kev sim qaug zog nrog kev thauj khoom ntawm 20 cycles / thib ob qhia tias tom qab 2 lab lub voj voog, cov pob zeb dawb tuaj yeem tiv taus qhov siab tshaj plaws ntawm 50% ntawm nws lub zog flexural, thaum fiber ntau nrog 0.3% ntau npaum tuaj yeem tiv taus ib qho qhov siab tshaj plaws ntawm 65% ntawm nws lub zog flexural.

1.3 Durability

Freeze-Thaw Resistance: National Building Materials Testing Center tau kuaj qhov khov-thaw tsis kam ntawm polypropylene fiber ntau pob zeb nrog ob qhov sib txawv ntim piv siv GBJ 82-1985 tus qauv. Cov qauv ntsuas 100 × 100 × 100mm tau sim thaum muaj hnub nyoog 28 hnub, simulating lub hli txias tshaj plaws nrog qhov nruab nrab kub ntawm -5 txog 0 degree . Cov txiaj ntsig tau pom tias ntxiv polypropylene fibers tau txhim kho qhov khov-thaw ua haujlwm ntawm pob zeb tom qab 50 lub voj voog khov-thaw.

Carbonation thiab Alkali-Aggregate Reaction Resistance: Polypropylene fiber ntau pob zeb txhim kho kev tiv thaiv carbonation thiab alkali-tag nrho cov tshuaj tiv thaiv feem ntau los ntawm kev txo ntau yam kab nrib pleb, yog li txhim kho qhov ntom ntawm cov pob zeb.

2. Kev siv ntawm Polypropylene Fiber Concrete

2.1 Tsev Engineering

Polypropylene fiber ntau pob zeb yog siv rau ntawm qhov chaw casting ntawm hauv qab daus slabs, sab phab ntsa, ru tsev slabs, dej tso tsheb hlau luam, thiab lwm yam self-waterproof qhob vaj tse, raws li zoo raws li loj-volume qhob Cheebtsam xws li foundation beams thiab slabs nyob rau hauv high-sawv vaj tse. . Nws txhim kho kev ua haujlwm thiab pab txhim kho impermeability, tawg tsis kam, thiab khov-thaw tsis kam ntawm tus kheej-waterproof pob zeb, zoo daws cov kab nrib pleb los ntawm qhov kub ntxhov hauv cov pob zeb loj.

2.2 Civil thiab Hydraulic Engineering

Cov kev ua vaj tse, choj lawj, cov pas dej da dej, cov chaw nres nkoj, thiab cov kav dej nrog polypropylene fibers pom zoo tag nrho cov kev ua tau zoo, xws li lub zog flexural, tawg tsis kam, qaug zog tiv thaiv, hnav tsis kam, thiab seawater yaig kuj, piv rau cov pob zeb ua haujlwm zoo tib yam. Tshwj xeeb tshaj yog nyob rau hauv cov tsheb loj thiab nquag tsheb dhau, qhov qaug zog tiv thaiv ntawm polypropylene fibers yog ntau pronounced. Hauv cov xwm txheej uas muaj kev hloov pauv huab cua hnyav thiab nquag khov-thaw lub voj voog, qhov khov-thaw tsis kam ntawm polypropylene fiber ntau pob zeb yog ua kom pom tseeb.

2.3 Precast Khoom Siv Khoom

Polypropylene fiber ntau pob zeb yog siv rau hauv cov pob zeb ua kom muaj zog precast thiab cov khoom siv cement (cov kav dej, cov blocks, thiab lwm yam) txhawm rau txhim kho cov tsos zoo, pab tiv thaiv thiab txo cov kab nrib pleb hauv precast Cheebtsam, txo cov ntug thiab kaum kev tawg, thiab nce impermeability los tiv thaiv steel reinforcement. corrosion.

2.4 Npaj-sib xyaw ua ke

Ntxiv cov polypropylene fibers rau cov pob zeb sib xyaw ua ke tuaj yeem txhim kho kev ua haujlwm zoo, txo cov ntshav, thiab tiv thaiv cov kab nrib pleb hauv kev lag luam. Polypropylene fibers tuaj yeem ua ke nrog cov khoom siv tshuaj lom neeg hauv pob zeb los tsim cov twj tso kua mis thiab lwm yam kev ua haujlwm siab. Cov pob zeb ua haujlwm siab, nrog nws lub zog siab, loj fluidity, thiab zoo heev durability, yog dav siv nyob rau hauv high-sawv vaj tse thiab ntev-ntev choj. Siv cov polypropylene fibers hauv cov khoom sib xyaw tuaj yeem txhim kho qhov toughness, tawg tsis kam, thiab ductility ntawm cov pob zeb ua haujlwm siab.