Formwork : a Practical Guide by Geoffrey Lee, Peter McAdam

By Geoffrey Lee, Peter McAdam

No optimise formwork expenses and minimise the time for its development, the contractor must comprehend the guiding ideas of secure and effective formwork development. He should also have a few perception into the relative advantages of the.

summary: No optimise formwork charges and minimise the time for its development, the contractor must comprehend the guiding ideas of secure and effective formwork building. He should also have a few perception into the relative benefits of the

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With unsealed surfaces it is quite unsuitable for formwork, the absorption of water is too great. However, specially formulated particle board bonded with moisture resistant glues and surfaced with suitable sealants can be used for formwork. Where these sheets are cut, attention must be paid to edge sealing to prevent water penetration. RELEASE AGENTS As noted previously, all formfaces should be given at least one coat of release agent. Its primary function is to prevent the adhesion of the concrete to the formface.

The sequence of failure may proceed along the whole length of the wall form. Wall tie failure is most common where deep revibration of the concrete is done. In summary, the formwork constructor must think beyond the case of the formwork being able to doing only the calculated structural task. Overloads do occur, and occasionally they can cause failure. Often this failure is initiated by minor defects, or minor mistakes in construction. To ensure that any failure that occurs causes only the minimum damage and hazards, the formwork should be arranged with the failure mode in mind; a failsafe structure, one that does not readily tend to a progressive collapse if overloaded.

The formulation of the resin should be selected to suit the intended service life of the formface. This should be discussed with both the plywood and the resin suppliers. 3. The type of glass reinforcement selected must also relate to the intended service life. Normally chopped strand mat with a surface tissue is adequate. If greater strength is needed then woven rovings can be used between two layers of chopped strand mat. 4. The stiffness of the plywood is important. If the vibrator compaction of the concrete induces the formface to vibrate in sympathy, then the resultant concrete face may have serious discolouration.

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