Abstract
Increasing amounts of sustainable concretes are being used as society becomes more aware of the environment. This paper attempts to evaluate the properties of precast concrete elements formed with recycled coarse aggregate and low clinker content cement using recycled additions. To this end, six different mix proportions were characterized: a reference concrete; 2 concretes with 25%wt. and 50%wt. substitution of coarse aggregate made using mixed construction and demolition wastes; and others with recycled cement with low clinker content. The compressive strength, the elastic modulus, and the durability indicator decrease with the proportions of recycled aggregate replacing aggregate, and it is accentuated with the incorporation of recycled cement. However, all the precast elements tested show good performance with slight reduction in the mechanical properties. To confirm the appropriate behaviour of New Jersey precast barriers, a test that simulated the impact of a vehicle was carried out.
Highlights
CCoonnssttrruuccttiioonn aanndd ddeemmoolliittiioCononnwwstaarsusttceeti(o(CCnDDaWWnd)) iidssennmooonnl--ihthiaaozznaarrwddoaosuutses, aaisstteneoggnee-nnheearrzaaattreedddouiinns,aainnnyyert waste generate ccoonnssttrruuccttiioonn, rreehhaabbiilliittaattiioonncoonrrsddtreeummctooiloliitntii,oonrnehwwaoobrrikkli..taTTthihoeeniinondrduudssettmrriiaoallliatainnoddn ccwoononrsskttrr.uuTccthtiieoonninssdeeucctstootrrissalggeeanneedrraacttoeenstruction sectors pprraaccttiiccaallllyy tthhee ssaammee aammoouunnptt rooaffcnntioocnna--lhlhyaazzthaaerrddsooaumussewwaamasstoteeu((niinnt dodufusnsttorryny-33h77a,z44a11r77dkkotuǂ asannwddacscotoenn(ssittnrruducucttsiiotornny333557,884661997kkkttǂǂ))and construction 3 iinn SSppaaiinn [[11]]
Katz [21] investigated the use of precast elements at different ages to produce RA for new precast elements, concluding that the mechanical properties when using this type of aggregate in concrete, resemble those when using lightweight aggregates, such as those manufactured using fly ash
Characterization tests on concrete specimens and precast elements have been carried out usingChloawra-cctleirnikzeartiocnemteesntstsoanncdonrecrceytcelesdpeacgimgreengsataensd, opbretaciansitnegletmheenftosllhoawvienbgeceonnccalrursiieodnos.utFuirssintlgy, ltohwe -pchliynskiecral-cmemecehnatns icaanldprroepceyrctlieeds oafgmgrixegedatreesc, yocbletdainaginggregthaetesfoalrloewsuinitgabcleonfoclrutshieonms.anFuirfsatcltyu,rethoef physical-mechanical properties of mixed recycled aggregates are suitable for the manufacture of concrete and precast elements when the medium and coarse fraction is used
Summary
CCoonnssttrruuccttiioonn aanndd ddeemmoolliittiioCononnwwstaarsusttceeti(o(CCnDDaWWnd)) iidssennmooonnl--ihthiaaozznaarrwddoaosuutses,, (iiCnneDerrWtt ww) aaisstteneoggnee-nnheearrzaaattreedddouiinns,aainnnyyert waste generate ccoonnssttrruuccttiioonn,, rreehhaabbiilliittaattiioonncoonrrsddtreeummctooiloliitntii,oonrnehwwaoobrrikkli..taTTthihoeeniinondrduudssettmrriiaoallliatainnoddn ccwoononrsskttrr.uuTccthtiieoonninssdeeucctstootrrissalggeeanneedrraacttoeenstruction sectors pprraaccttiiccaallllyy tthhee ssaammee aammoouunnptt rooaffcnntioocnna--lhlhyaazzthaaerrddsooaumussewwaamasstoteeu((niinnt dodufusnsttorryny-33h77a,,z44a11r77dkkotuǂ asannwddacscotoenn(ssittnrruducucttsiiotornny333557,,,884661997kkkttǂǂ))and construction 3 iinn SSppaaiinn [[11]]. With regard to precast concrete elements, it should be noted that, according to the ANDECE (National Association of the Prefabricated Concrete Industry, based in Spain), the initial cost of elements is higher, the final cost is lower [35]. Katz [21] investigated the use of precast elements at different ages to produce RA for new precast elements, concluding that the mechanical properties (strength, modulus of elasticity, etc.) when using this type of aggregate in concrete, resemble those when using lightweight aggregates, such as those manufactured using fly ash.
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