Sustainable construction through eco-efficient ultra-high performance concrete

Abstract

An innovative type of steel-fibre reinforced ultra-high performance concrete (UHPC), including its constituent materials and its mixing procedure, is reviewed in this paper. Furthermore, an energy-efficient curing method for developing precast UHPC members is presented as the main goal of the current study. It was found that just with 24 hours of curing in tempered water or steam with 67°C, 95% of 28-day compressive strength in normal curing method, 145 MPa, could be achieved which would be of great interest for prefabrication industry regarding their energy consumption. It also would be beneficial for any project in which early load-bearing capacity is expected. Self-compactness, compressive strength higher than 150 MPa, improved durability and finally low curing energy in precasting phase of the material all offer variety of slim interior and exterior architectural and structural applications even in high-rise structures and aggressive environments where higher strength, ductility and durability is required.

Durability of an UHPC containing spent equilibrium catalyst

“…The compressive strength at 28 days achieved with each composition (also included in Supplementary Table S3) ranges from 107 to 172 MPa [61,[64][65][66][67][68][69].…”

“…The resistance of the concretes to the CO 2 penetration is often evaluated by accelerated carbonation test in a CO 2 -enriched chamber and with a favourable humidity. Besides the differences in exposure conditions found in [45,47,58,[69][70][71][72][73][74], all studies showed that the carbonation depth on the UHPC/UHPFRC is extremely low.…”

Influence of cement replacement by metakaolin and limestone filler on the properties of UHPC

“…Usprkos brojnim prednostima, UHPC, kao i svaki materijal, ima i nedostatke, a glavne čine: relativno visoka cijena, nedostatak odgovarajućih standarda, krhki slom, zahtjevan proces miješanja, visoko autogeno skupljanje te nedovoljno dugoročnih istraživanja o ponašanju UHPC-a u određenim uvjetima [2,3]. Iako se UHPC, dugoročno gledano smatra ekološkim materijalom, istraživanjima se želi postići još veća ekološka učinkovitost te smanjiti njegova cijena [4]. Na taj način, pojedina istraživanja [4][5][6][7][8][9][10][11] daju prijedlog primjene zamjenskih cementnih materijala u sastavu UHPC-a, načina poboljšanja njegovih svojstava te načina smanjenja negativnog učinka na okoliš i postizanja održivog razvoja.…”

“…Iako se UHPC, dugoročno gledano smatra ekološkim materijalom, istraživanjima se želi postići još veća ekološka učinkovitost te smanjiti njegova cijena [4]. Na taj način, pojedina istraživanja [4][5][6][7][8][9][10][11] daju prijedlog primjene zamjenskih cementnih materijala u sastavu UHPC-a, načina poboljšanja njegovih svojstava te načina smanjenja negativnog učinka na okoliš i postizanja održivog razvoja. Cilj ovog rada je utvrditi utjecaj zamjenskih cementnih (metakaolina i vapnenačkog filera) i nano materijala (nanogline) na svojstva UHPC-a.…”

Sustainable construction material: Ultra-high performance fibre reinforced concrete (UHPFRC) for railway bridges in Malaysia

“…In Malaysia, the railway bridges are constructed using precast reinforced concrete (PRC) beams as superstructures. Elimination of the conventional steel reinforcement bars and stirrups [8] can drastically reduce construction time and labour costs, which will result in saving immediate project's cost. Therefore, this research is to review the applicability of UHPFRC beam for railway bridge superstructure in Malaysia based on the experienced the country had for highway and pedestrian bridges.…”