unit 5 & unit 6: seismic lateral force analysis

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FTC-001R2

FRP Wet Lay-upSample

PreparationGuideline

Report Prepared byFTC

Dec9, 2012


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FTC-001R2, Dec 2012 1

FRP Wet Lay-up Sample Preparation Guidelines

Section 1: The following preparation guidelines are applied to the hand lay-up processto prepare TYFO FRP test

plates for tensile testingwith TYFO Fabric and TYFO Epoxy.

Step 1: FRP wet lay-up sample set-up

The set-up includes: 1)Flat Glass orAluminium Plates*:Onelevel base plate and one top plate.

2) Thick Polyvinylchloride (PVC) film; 3) Scissors;4) Leveler to leve base plate if not already level.

5) Gloves; 6) Plastic trowel; 7)Roller brush; 8)Measuring cup and mixingstick. 9) 4 Nos. C-Clamps.

Step 2: Level the base plate

The base plate with is to be leveled.


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Step 3: PVC film and fiber fabric cutting

Two pieces of PVC film are cut with dimensions to completely cover the base plate; Two pieces of the

selected TYFO Fabric is cut fromthe roll havinng minimum dimensions of 18 x 18.

Step 4: Resin mixing

Weigh the resin parts A and B according to the stoichiometric ratio and mix thoroughly with the wood

stick.Alternatively an entire preproportioned set ot TYFO Epoxy can be mixed.


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Step 5: Saturation of the fiber fabric

Pour the mixed resin system on the leveled plate (covered with PVC film). A little bit more resin is

required.

Place the First Layer of fabric on the resin and saturate the fabric with the plastic trowels throughpushing and squeezing the resin into the fabricin the primary fiber direction.Take care to keep fibers

straight. Ensure the entire fabric is saturated (pour additional epoxy as needed).


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Step 6: Squeezing out the extra resin and air bubbles

Pour some more resin on the First Layer of saturated fabric and distribute on the surface slightly with the

plastic trowel. The additional resin is required to ensure that air bubbles are released. Repeat Step 5

and Step 6 when applying the Second Layer of fabric over the First Layer. Ensure that the Second

Layer of Fabric has the primary fibres of the fabric placesd exactly parallel to the First Layer of Fabric.

Any slight deviation will effect the test result.

Place the other PVC film on top of the saturated fibers. Use a clean plastic trowel to carefully squeeze out

the all the extra resin and air bubbles. Note the squeezing direction with the trowel isalong the primary

fibers. There will be no visible air bubbles in the sample, and the fiber rows will not be separated remarkably

(the gap between the fiber rows is slight).


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Step 7: Put another plate on the top

Placethe top plate directly on the PVC Film.Gentlyglamp the base plate tothe top plate if using aluminium

plates. If using glass plate place a weight over the top glass plate as clamps might crack the glass.

Step 8: Sample Storage and Shipment

Carefully remove the sample from the mold after curing time discussed below. Note the squeezed resin cured

on the edges.


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The time needed to remove the sample from the mold is dependent on temperature. The curing profile

can be checked by the resin squeezed out from the mold. If the resin is still very brittle and weak (e.g.,

the resin film on the edge is easily broken due to flexure), this indicates more curing time is needed. The

sample can be removed from the mold when the resin feels tough, despite brittleness. Generally, at 73

degrees F, at least 24 hours are needed before removing the sample from the mold.

The samples shall be labeled immediately (for labeling information, see Appendix A) once they are

removed from the molds.

Field samples shall be stored in adry environment such as the job trailer. The samples should be

placed or stored on a flat surface before shipment.

Shipment:

The epoxy film on the edge of the sample may be removed.

Please note,donot cut the partswith fibersalthough trimming the sample plate down to appox. 16"X16" is

acceptable. The sample is carefully wrapped with plastic foam film and fixed with tape.

Put the packed sample into the cardboard for shippingif sending out bu coureier to the test tab.

During the time between removing the sample from the mold to putting the sample into the box, you

should be very careful to avoid any actions that cause the plate to warp, flex etc. The epoxy is not fully

cured and brittle at this stage. Careless handling will bring in small craze of resin and fiber damage,

which leads to lowered test results. Note: The utmost precision must be taken when preparing

samples as any errors in preparation, handling and cutting will effect the test results.


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Packing the specimen with plastic foam sheet and stick tape.


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Appendix A:

Labeling (using water proof pen or sticker)

Date of sampling:

Project Name:

TYFO FRP Material Name:(eg. TYFO SEH51A with TYFO S Epoxy)

Lot Number:

Roll Number:

Date of Manuffacture:

Sample Prepared by:

Remarks (if necessary):

unit 5 & unit 6: seismic lateral force analysis

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