Abstract
Freeze-thaw (F-T) damage is the major factor destroying the bond behavior of reinforced concrete in the cold areas of China. The bond behavior between recycled fiber recycled concrete (RFRC) and reinforcement after F-T cycles was investigated in this paper. The pull-out tests were undertaken with the replacement rate (0, 50%, and 100%) of recycled aggregates (RA) and volume content (0, 0.12%, and 0.24%) of recycled fibers (RFs) as test variables. The results demonstrate that the F-T cycles will reduce the bond strength between RFRC and reinforcement. Bond strength decreases by 69.41% after 150 cycles. Moreover, RF can improve the bond strength between RFRC and reinforcing steel. Bonding strength increases by 11.35% with the addition of 0.12% RF. A simplified two-phase bond-slip model between RFRC and reinforced steel after F-T cycles was eventually established, and it correlated well with the experimental results. This research presents a theoretical basis for the application of RFRC in building structures in cold areas.
Highlights
The booming construction industry has accelerated the consumption of natural resources, while generating huge amounts of construction and demolition waste (C&DW) [1]
To verify the inhomogeneity of the recycled aggregates (RA) to improve the bond stress, this paper introduces μ1, μ2, and μ3 bondstress inhomogeneity coefficients for analysis, and they are cianltcruoldatuecdesasμf1o,lμlo2w, asn. d μ3 bondstress inhomogeneity coefficients for analysis, and they are calculated as follows
The bond behavior of recycled fiber recycled concrete (RFRC) and reinforcement after the F-T cycle was investigated by using the pull-out test
Summary
The booming construction industry has accelerated the consumption of natural resources, while generating huge amounts of construction and demolition waste (C&DW) [1]. Each year, on a global scale, over 1.5 billion tons of C&DW are produced, of which, nearly 700 million tons are in China, as shown, and this number keeps growing [2] Such a huge amount of C&DW-occupied land, as seen, pollutes air and water resources as well [3]. More than 13 million tons of waste carpets are produced, of which, mainly polypropylene fibers ctharapnet1[336m].iIllnioanddtoitniosnotfowdiasspteoscaalrbpyetths ealraenpdrfioldl,uincceidn,eroaftiwonhiwchil,l mcaauisnelysepriooluyspproopllyulteionne tfiobtehreseccaorlpoegtic[3a6l ]e.nIvniraodndmiteinotn(Ftoigduirsep2o)s[a3l7b]y; rtehgereltatnadblfiyl,l,ainneccinoenroamtioicnalwainldl ceanuvsierosnemrioeunstpaolllyluftriioenndtolytshoeluetcioolnoghiacsalneont vyiertobnemenenptr(oFpiogsuerde.2I)t i[s37a];throergnreyttparbolbyl,eamn, ewcoitnhotmheicgaolaalnodf “ecnavribroonnmneeunttaralllyityfr”ieannddly“csaorlubotinonpehaaksinnogt”y[e3t8]b.een proposed. It is a thorny problem, with the goal of “carbon neutrality” and “carbon peaking” [38]. UTahteiroenf.orTeh, tehriesfopraep,etrhpisroppaopsesr tphreocpoonsceespthoef rceocyncleepdtfiobfererceycyclceleddfciboenrcrreetcey(cRlFeRdCc)o. nFcibretres (aRreFRtaCk)e.nFfirboemrstahreewtaaksetencfarropmett,hfierswtlays;tcelecaanrepdeta,nfidrsdtliysi;ncfleecatneded, saencodnddilsyi;nafnecdtemde, csheaconnicdalyly; aand meacnhuaanlliycaclulyt,afinndalmlya, ntoualclqyuciuret,fifibnearllsye,gtmo eanctqsu. iCreoafirbserasgeggrmegeanttess. cCoomaresferoamggCre&gaDtWes. cSoimuelfartoinmg Cth&eDhWars.hSicmoludlaetninvgirothnemheanrtsohf cNooldrtheneavsirtoCnhminean,twoef NpeorrftohremaestdCFh-Tintae,swtse(0p, e5r0-, f1o0r0m, 1e5d0Fc-yTctlest)sw(0it,h50R,A10r0e,p1la5c0ecmyeclnets)rawteisthoRf 0A, 5re0p%la, caenmde1n0t0r%at;eRsFofv0o,lu5m0%e,caonndte1n0ts0%of; R0,F0v.1o2l%um, aencdon0t.2e4n%ts aosf v0,ar0i.a1b2l%es, ;aanndd0fi.2v4e%graosuvpasr,iawbiltehs;6a0nsdpeficvime genrosuipnst,owtailt.hT6h0esbpoencidmbeehnasviinortobteatl.wTeheenbRoFnRdCbeahnadvrioeirnbfeotrwceemenenRtFuRnCdaenr dF-rTeicnyfcolrecsemwaesntstuunddieerdF. -ATdcdyictlieosnwalalys, slotucdaliebdo.nAdd-sdliiptiotensatsllyw,elroecaclobnodnudct-esdliptoteinstvsewsteigreatceotnhdeudcitsetdribtoutiinovnelsatwigaotfebtohneddsisttrreisbsuwtiiotnh lRaFwRoCf5b0-o1n2dsesrtrieess.sAwbitohnRdF-sRliCp5m0-o1d2esleurineds.erAF-bToncodn-sdliiptiomnowdaesl eusntdabelrisFh-eTdc. oInndthitiisonpawpaers, ewsetapbrloisvhiedde.nIenwthidiseapsafpoerrt,hweeappprolivcaidtieonneowf widasetaescfaorrpetht eanadppCl&icDatWionanodf wpraosmteoctearinp-edteapntdh Cre&seDaWrchanond tphreomreocytecliinn-gdeopf tthheressoelaidrcwhaosntethine creocldycrleinggioonfs.the solid waste in cold regions
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