The 2 application on concrete structure
Pool of concrete lay aside, container, swimming-pool or concrete boat have flaw easily, produce leakage, get chemical material easily also especially acidity liquid is eroded, can use not saturated polyester for this liner or undertake repairing. When affirmatory the programme of construction, must the reason that careful examination analyses all sorts of break to happen, take step. One kind is small exterior craze, concrete matrix is stable; Another kind is structural load overweight or change repeatedly the craze of matrix shift sex that cause; Because hot Peng is cold,the 3rd kind is matrix shrink and natural craze. Stable to matrix craze can be repaired with colophony; Not stable to matrix craze is unfavorable repair with colophony.
2.1 break are repaired
If be exterior crackle only, can prepare in concrete surface construction handle along with all the others in the job. Answer to deeper, wider break and the flaw that have liquid leakage or infiltration processing of go ahead of the rest, its handle method to be as follows. ① shakes interstitial place grain purify. The grease that ② exists the likelihood in break, sundry etc clean clean, what make is dry. ③ inserts pressure inject tube by 15cm interval, infuse is fast the colophony puddle of solidify, make interstitial two sides is stuck tighten and sealed. The inject pressure of colophony puddle cannot pass big, lest create break,expand further. After ④ waits for the daub solidify of the inject in break, excise projecting inject canal, reoccupy puddle covers interstitial area close-grained. Above break repairs a circumstance to see graph 17-3.
If be not pressed,go up the law is repaired, cut break a notch merely, puddle of again manual cram, can make interstitial mouth expands, seam inside fill up not close-grained, still can produce leakage later.
2.2 concrete finishing
Concrete finishing process is as follows. ① concrete surface should clean purify grease, paint, sundry, those who be like the surface is smeary should wipe with cleaner clean, paint can be ground clean or with divide except lacquer clean. ② builds content newly to want to 28 days maintain period, maintain be not worth 28 climate, cement does not have enough strength, cannot coverture colophony, and cement continues alkalescent meeting prevents the surface when solidify solid knot causes colophony and concrete to be stuck to receive by cladding undesirable. ③ has in season to concrete surface arenaceous, etc of purify surface layer is loose content, arrive a makings show till. Blow arenaceous degree and armor plate to comparative, after be being blown purify of will arenaceous dirt, reoccupy vacuum is clean implement clean surface. ④ classics after afore-mentioned processing state of careful examination surface, cave place it is 1:1 with scaleThe colophony of 0 and sand mixture fill are wiped smooth. ⑤ if need not gush sand preparation can be corroded with acid. With 10 ％ ～ the hydrochloric acid solution of 15 ％ presses 0.5L ／ M2Besmear Fu at concrete surface, reoccupy tigidity brush makes surface of acerbity fluid infiltration, make the surface foamy, the bathe after waiting for bubble to stop issues dry completely. If discover break,⑥ passes pickling hind, with the reoccupy after water divides acid rare ammonia water is counteracted. After ⑦ concrete surface is dry, with brush, roller or spray gun coverture a priming paint, those who make is sealed. If use polyester colophony to make priming paint, should add 25 ％ (quality mark) styrene, in order to reduce polyester resinous viscosity, aperture of made easy infiltration concrete. If use epoxy resin, can use the colorless resin of dissolve the form of a drug.
2.3 colophony and fiber lay up
What two above can use when papering law lay up with the hand is short cut fiber felt or thick grid cloth and short cut felt alternant superposition, short cut felt to be able to use 300g ／ M2Or 450g ／ M2Two kinds, thick grid cloth uses 300g ／ M2, spread after with exterior felt. Should hand in in felt and cloth juncture place fold 5 ～ 8cm, or use 50 ％ to fold shop law, eventually the layer adds up to ply to want to be more than 2.5mm. Colophony can use a brush or roller besmear Fu goes up, get on felt or cloth shop in colophony next, reoccupy layer adds up to what roller squeezing ramming makes to soak, after roller is pressed must nonexistent bubble reachs visible air to did not soak resinous trace. Be like want when lay up is thicker statified shop, a gel hind spreads again, lest reaction heats up assemble. When felt of the face that spread a list, must be in hind spread before gel of a colophony. When vertical plane construction, should add touch change the agent prevents to shed glue. When using eject law lay up, roller wants to press after every fiber and colophony gush Fu drenched, eliminate bleb, want gush Fu at least two, ply exceeds 2.5mm. If need when the layer is thick but grading construction, the reentry after gel of the phase before making issues level construction all right. Want quality of microscope gush cladding, if discover pinhole, fibre glass is drenched and undesirable, be short of bleb of colophony area, conceal or fiber to appear when waiting for blemish, abrasion of usable and portable emery wheel this part, expand at least 10cm limits, the fiber mat with sufficient macerate of again new coverture. If colophony is chromatic already, conceal bleb to discover not easily, want scrutiny. Hind, exterior Fu a colophony. According to medium the requirement can choose different facing colophony, be able to bear or endure goodly in order to obtain aggressivity. Facing colophony also can add filling or chromatic, in order to achieve wear-resisting and adornment result; Usable also contain candle the colophony of 0.6 ％ , prevent small air block to get together. Time of facing resinous gel does not exceed 15min, but sufficient solidify should be controlled 1 week. The dishcloth rub-up of acetone should pass with dip after sufficient solidify, check its solidify rate, if have bate or deliquescent appearance,be solidify namely insecure, should grind with emery wheel, colophony of the facing on new store.