PSI - Issue 11

Petr Stepanek et al. / Procedia Structural Integrity 11 (2018) 12–19

14

3

Petr Stepanek a

t al. / Structural

Integrity Proced

ia 00 (2018) 000–

000

the P desig T viny reinf 90, spec chan 2.2. For was At lo conf refer

REFA KOM nation GFRP he vinyl este l ester resin a orcement at d 180 and 360 imens were s ge between 1 The results exposure time destroyed. Ev wer tempera irmed by an o ence one, the

POZITY, a.s. -E were used r resin Ashla nd siliceous s efined expos days respecti tored in cont 2.66 and 12.9

manufacturer . nd Derakane and. The aim ure times. So vely. The alk ainers filled 7.

. ECR fibres 411-45 was of the experi far, the specim aline solution with alkaline

(R25H 2400, used as a ma ments was to ens were su was prepare solution at 2

manufacturer trix. The cov determine th bjected to alk d according 0 °C, 40 °C

3B; 80% by er/adhesive l e level of deg aline conditio to ACI 440.3 and 60 °C a

weight), spec ayer was mad radation of G ns for 1000 h R (2012). Al nd the pH v

imen e of FRP ours, l test alues

rebar sible. been h the

365 days in en after clean tures 20 and 4 ptical micros re was a cons

an alkaline s ing, a precipi 0 °C, the deg cope analysis iderable diffe

olution at 60 tated layer of radation of t . When comp rence in the su

°C, the adhe hydroxide an he surface wa aring the rein rface structu

sion of the sa d calcium ca s not so sign forcement sto re (see Fig. 1)

nd surface la rbonate was s ificant. These red in alkalin .

yer with the till clearly vi results have e solution wit

Fig. 1. Reference

GFRP-E reinfor

cement stored in

a laboratory env alkaline solution n a series of ests according ally presented

ironment expose at 40 °C (right)

d to air (left); GF

RP-E reinforcem

ent stored 365 da

ys in

F mini are s

or each obse mum of six s ummarized in

rved time, t amples. Tens Table 2 and

ensile tests o ile strength t 3 and graphic

GFRP reinf to ISO 1040 in Fig. 2 and

orcement sp 6-1 (2015) w 3.

ecimens were ere done. Th

performed e obtained re

for a sults

52 57 62 67 72 77 82 Tensile strength [MPa] 0 0 0 0 0 0 0

20° 40° 60°

C C C

42

92

142

192

242

xposure time and ngth are clea about 25 %. H on coefficien eviation. 292 Immersion time

342 [days]

Fi rom the obta orcement. Fo elatively larg eds 0.1. Dot l

g. 2. Dependence ined results, r GFRP-E spe e variance of ines on the Fi

of tensile streng the percentag cimens the te the obtained g. 2 denote th

th of GFRP-E re e decreases o nsile strength results, whe e mean value

inforcement on e f tensile stre reduction is re the variati +- standard d

temperature of s rly visible fo owever, it is t in some tes

olution r degraded G necessary to ted configura

F reinf the r exce

FRP note tions