The possibility of applying steel slag as mineraladmixture in steam-cured concrete was investigated. Thecompressive strength, chloride permeability, carbonationdepth and drying shrinkage of concrete and the microstruc...The possibility of applying steel slag as mineraladmixture in steam-cured concrete was investigated. Thecompressive strength, chloride permeability, carbonationdepth and drying shrinkage of concrete and the microstructurecharacteristics of hardened paste were studied. Results showthat the steam-cured concrete containing steel slag at a highwater-to-binder ratio has low compressive strength, coarsepore structure, moderate permeability, large carbonation depthand great drying shrinkage. The negative effects of steel slagon the mechanical and durability performance of steam-curedconcrete become smaller at a low water-to-binder ratio or byadding ultrafine ground granulated blast furnace slag（UGGBS）. The later-age hydration of cement is significantlypromoted by adding steel slag. The pozzolanic reaction andmicro-filler effect of UGGBS result in dense structure, whichmakes great contribution to the strength development anddurability performance of steam-cured concrete. These effectsof steel slag and UGGBS are significant at a low water tobinder ratio. The steam-cured concrete containing steel slag-UGGBS blended mineral admixture at a low water-to-binderratio has the best performance with high compressive strength,fine pore structure and good durability.展开更多
The resistance to chloride penetration of cement-based material with different curing regimes was investigated by solution titration,XRD,LF-NMR and rapid chloride migration test.The results show that the curing regime...The resistance to chloride penetration of cement-based material with different curing regimes was investigated by solution titration,XRD,LF-NMR and rapid chloride migration test.The results show that the curing regime has influences on the types and structure of the hydration products,which in turn affects their ability to bind chloride ions.The binding capacity of cementitious materials to chloride ions,porosity and chloride ion migration coefficient increased with the increase of water-cement ratio,while steam curing increased the porosity and chloride ion migration coefficient at the same time as it increased the chloride ion binding capacity of the materials.At lower water-cement ratios,the effect of steam curing on the resistance of cementitious materials to chloride ingress is negligible.展开更多
基金Postdoctoral Science Foundation of China(No.2015M580992,2016T90036)the Open Fund of State Key Laboratory of High Performance Civil Engineering Materials(No.2015CEM010)
文摘The possibility of applying steel slag as mineraladmixture in steam-cured concrete was investigated. Thecompressive strength, chloride permeability, carbonationdepth and drying shrinkage of concrete and the microstructurecharacteristics of hardened paste were studied. Results showthat the steam-cured concrete containing steel slag at a highwater-to-binder ratio has low compressive strength, coarsepore structure, moderate permeability, large carbonation depthand great drying shrinkage. The negative effects of steel slagon the mechanical and durability performance of steam-curedconcrete become smaller at a low water-to-binder ratio or byadding ultrafine ground granulated blast furnace slag（UGGBS）. The later-age hydration of cement is significantlypromoted by adding steel slag. The pozzolanic reaction andmicro-filler effect of UGGBS result in dense structure, whichmakes great contribution to the strength development anddurability performance of steam-cured concrete. These effectsof steel slag and UGGBS are significant at a low water tobinder ratio. The steam-cured concrete containing steel slag-UGGBS blended mineral admixture at a low water-to-binderratio has the best performance with high compressive strength,fine pore structure and good durability.
基金Funded by the National Natural Science Foundation of China (Nos. 51972249, 52172026, 51772226)。
文摘The resistance to chloride penetration of cement-based material with different curing regimes was investigated by solution titration,XRD,LF-NMR and rapid chloride migration test.The results show that the curing regime has influences on the types and structure of the hydration products,which in turn affects their ability to bind chloride ions.The binding capacity of cementitious materials to chloride ions,porosity and chloride ion migration coefficient increased with the increase of water-cement ratio,while steam curing increased the porosity and chloride ion migration coefficient at the same time as it increased the chloride ion binding capacity of the materials.At lower water-cement ratios,the effect of steam curing on the resistance of cementitious materials to chloride ingress is negligible.
