EN 1170-3-1997 pdf download.Precast. concrete products — Test method for glass-fibre reinforced
cement. — Part 3: Measuring the fibre content of spmyed GRC.
This EN 1170-3 tcifles a test method for verifying, during production. the fibre content of sprayed glass-fibre reinforced cement.
2 Normative references
This European Standard ineoqxinltes by dated or 1U1(lated reference, provisions from other palhhrut]Ons. flwse nonna1hi references art riled at the appropr ate places in the text and the publications are listed hereafter. For dated n1erences, subsequent alnen(hnenls to or revisions of any of these publications aPPlY to this European Standard only when incorporated in it by amendment or revision. For wuhuted references the 1ate4 edition of the publication referred to al)l)hes.
EN 1170-2 Thirast ,wrete ,)rr%IurIs — Test uetkod for ss:fbre n’ifoin”d cuwuI — Part 2:
M’a.cu ring Ihe’Jhr’ rmfrnt n fth
CRC— 14zsi. out tist m,’thød
3 Symbols and abbreviation
3.1 Symbols
G. fibre content, in 1wnn1t by niass na mass, in grarnc
I tinw. in seconh
3.2 Abbreviation
GRC glass-fihire reiithnrcd eciuenL
4 Apparatus
The apparatus compnses
— 1 bucket, with a rapacity of approximately 101;
— I srak’, with a measuring range from 0 kg to 0 kg.
accurate to 10 g
– I stopwatch. accurate to I s
— I arntainer for uv.zste with a capacity of approximately 51.
5 Procedure
11w test f4idl be Cahlied out Lulder the SW1W COfl(IitlOilS as actual production.
Veigh the empty bucket, i.e. in1 (in grams). Weigh the glass-fibre roll, i.e. n&(in grams). Start the pump and spray the matrix (without fibres) into the waste container for a brief moment. Start the cutter W1(l the stopwatch and spray (matrix and fibres) into the bucket for a tune 1’ expressed in s, of not less than 30 a, measured with an accuracy of 1 a. Direct the spray to the waste bucket and stop the cutter and matrix pump.
Weigh the bucket filled with fibres and matrix, i.e. ,n (in grams).
.%eigh the glass-fibre roll, i.e. in4 (in grams). Calculate the fibre content as described in daiLse 6. Record the air prissure from the pump iIsIIre gauge.
NOTfI Ii Ia pouibIc to carry out a separate output tral (flbrr only and mathx without fiLrrs) In onlrr to v’erhf In a %irnplifird way, the correct working of the equipment.
6 Calculations
The fibre content Ge, expressed as a pen’entage by weight. is deteniwwd by the following equation.
G(. = ??t4 x too
— In,
7 Interpreting the test
The optimum vahw is determined by the specification and is a function of end use.
if the result obtained does not comply with the specified value, cany out a second test to validate the ilifomlatlon before making adJUsInIents to 11w pRWtSS. NOTI The spectfled flbre content (nbeaal fibre content) Is net by Liii. manufaduirr a funeton of the añabillty of the pmduction no that the g)ann-flbce rntent of the products Is at leant equal to the specefkd value (see annex A)
8 Test report sheet
The test nx)rt sheet shall rompnse the following eleinetits:
— the date of test;EN 1170-3-1997 pdf download.