Well-known polypropylene fiber is widely used in concrete engineering in today small series to specifically follows:

Engineering polypropylene fiber on concrete construction technology requirements
1. Technical requirements of concrete indicators
Concrete slump range: 180 ~ 220mm.
2. Raw materials
2.1 cement shall conform to GB175. GB1344 provisions of the standard
2.1.1 The cement is preferred over # 425: PO, PS cement
2.1.2 cement factory must have a certificate of quality, storage time should not be greater than 3 months.
2.1.3 cement into the plant before use must reinspection qualified.
2.2 ash should be used in line with the above level 2 Fly GBl579 standards.
2.2.1 factory quality certification should fly into the plant reinspection must meet the requirements before use.
2.3 concrete gravel must be met, in line with the relevant technical requirements.
2.4 mixed with additives should be selected depending on project needs, but must do compatibility tests meet the construction requirements before allowing the use of (strength, setting time, slump loss).
2.5 incorporated polypropylene fibers in concrete construction must comply with the technical requirements, including strength, fineness, elastic modulus, dispersion will
Shall comply with the relevant technical requirements.
2.5.1 polypropylene fibers must be specially treated, in a natural state, the uniform dispersion of the product.
2.5.2 polypropylene fibers must be measured once per plate.
2.6 mixing large liquidity pumped fiber concrete should be preferred vertical shaft compulsory mixer, concrete illiquid preferred horizontal shaft mixer.
3. Concrete Construction
3.1 Concrete Mix ratio shall be determined experimentally determined.
3.2 When the concrete workability not meet the requirements, need to be adjusted by the technical staff, and other personnel shall not be adjusted.
3.3 concrete mixer
3.3.1 feeding weighing deviation shall not exceed the value of the following provisions:
Cement 2%, 2% admixture. Admixture 0.5%; 1% fiber, 0.5% of water; 2% Aggregate
3.3.2 feeding sequence
Measurement cement, sand and fiber measurement, and measurement of water admixtures. Mixing time of not less than 150S.
3.3.3 Background Requirements
3.3.3.1 weighing must be accurate, feeding sequence must be accurate.
3.3.3.2 Each class to measure the moisture content of sand to ensure accurate mixing ratio.
3.3.3.3 Admixture measurement must be accurate and polypropylene fibers, the fibers should be measured once each plate, together with the sand into the mixer, measuring inputs must seriously.
Requirements 3.3.4 Reception
3.3.4.1 When hot summer pumping concrete construction, the need for pumping tube shade house coverage, lower pouring temperature, reduce slump loss.
On-site pumping concrete slump should be controlled at 1 80 ~ 200mm.
3.4 Requirements fiber concrete pouring
3.4.1 surface after pouring concrete should be used mugang Calibrating wood wipe before initial setting of concrete were rubbing surface treatment (no less than three times), rub the surface with rubbing surface craft retreat.
When concrete water loss began to lose plasticity, second, third time rubbing surface treatment to address settlement shrinkage cracking of concrete cracks, rubbing surfaces must be done to rub, rub strict, then immediately covered with plastic sheeting to prevent water evaporation over fast.
3.4.2 concrete into the opposite should be the final setting of the appropriate layer to add moisture to check whether the cover tightly with plastic sheeting.
3.5 form removal and conservation
3.5.1 concrete form removal should meet Chaimo strength specification.
3.5.2 can not form removal member missing edge off angle, damaged.
3.6 field test done before each opening the opening identified, according to the provisions of the specimen retention.
4. Concrete Quality Standards
4.1 The materials and concrete must meet the technical requirements of the provisions, shall comply with the fashion of regulatory requirements GB50204-92

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