The applications of self consolidating steel fiber reinforced concrete are rising considerably worldwide due to several new advantages with respect to conventional concrete. One of the main obstacles of wider use of self consolidating steel fiber reinforced concrete is its sensitivity to small variations of the constituent materials, mix-proportions and other external factors. There is a great importance to have a robust mixtures which tolerate these deviations, i.e. should maintain its fresh and hardened state properties inside the specified limits. Allowable variations or errors as specified in EC 2 and ACI code for conventional concrete was applied to mix constituents of self consolidating steel fiber reinforced concrete to study the effects on its fresh and hardened state properties. Several mix designs were analyzed to verify whether these variations used in conventional concrete are still applicable to self consolidating steel fiber reinforced concrete. To achieve the aforementioned objectives, experimental tests were conducted at the level of cement paste, cement mortar and self consolidating steel fiber reinforced concrete. The fresh state performance, fiber dispersion and orientation, and hardened state properties of SCSFRC was considered for a thorough evaluation of robustness. Fresh state performance was measured by means of the slump-flow and V funnel test. Fiber dispersion was measured in the fresh state by fiber washing and in the hardened state by a non destructive magnetic probe test with ferrite core. The hardened state properties of self consolidating steel fiber reinforced concrete were measured by means of flexural tests, compression tests, tensile splitting tests performed on the specimens from each mixes. Moreover, the results from the fresh state and hardened state properties were correlated.
Le applicazioni di sé fibra d'acciaio consolidamento in cemento armato stanno aumentando notevolmente in tutto il mondo a causa di numerosi nuovi vantaggi rispetto al calcestruzzo tradizionale. Uno degli ostacoli principali di un più ampio uso di fibra d'acciaio auto consolidamento in cemento armato è la sua sensibilità a piccole variazioni dei materiali costitutivi, mix-proporzioni e altri fattori esterni. Esiste una grande importanza per avere una miscela robusta, che tollera queste deviazioni, cioè deve mantenere le sue proprietà allo stato fresco ed indurito all'interno dei limiti previsti. variazioni ammissibili o errori, come specificato nella CE 2 e il codice ACI per il calcestruzzo convenzionale è stato applicato al mix di componenti auto in fibra di acciaio consolidamento in cemento armato per studiare gli effetti sulle sue proprietà allo stato fresco e indurito. disegni mix Diversi sono stati analizzati per verificare se queste variazioni usati nel calcestruzzo convenzionale sono tuttora in vigore per sé fibre di acciaio consolidamento in cemento armato. Per raggiungere gli obiettivi di cui sopra, le prove sperimentali sono state condotte a livello della pasta di cemento, malta di cemento e fibre di acciaio auto consolidamento in cemento armato. Le prestazioni allo stato fresco, la dispersione di fibre e di orientamento, e le proprietà dello stato indurito di SCSFRC è stato considerato per una valutazione approfondita di robustezza. prestazioni allo stato fresco è stato misurato per mezzo del flusso di crollo-e V imbuto di prova. dispersione di fibre è stata misurata allo stato fresco da fibra di lavaggio e allo stato indurito da un controllo non distruttivo sonda magnetica con nucleo in ferrite. Le proprietà dello stato indurito di sé fibra d'acciaio consolidamento in cemento armato sono stati misurati per mezzo di prove a flessione, prove di compressione, prove di scissione di trazione eseguite sui campioni di ogni mix. Inoltre, i risultati allo stato fresco e indurito proprietà di stato sono stati correlati.
Robustness of self consolidating steel fiber reinforced concrete
MUSA, ABDISA MOHAMMED
2009/2010
Abstract
The applications of self consolidating steel fiber reinforced concrete are rising considerably worldwide due to several new advantages with respect to conventional concrete. One of the main obstacles of wider use of self consolidating steel fiber reinforced concrete is its sensitivity to small variations of the constituent materials, mix-proportions and other external factors. There is a great importance to have a robust mixtures which tolerate these deviations, i.e. should maintain its fresh and hardened state properties inside the specified limits. Allowable variations or errors as specified in EC 2 and ACI code for conventional concrete was applied to mix constituents of self consolidating steel fiber reinforced concrete to study the effects on its fresh and hardened state properties. Several mix designs were analyzed to verify whether these variations used in conventional concrete are still applicable to self consolidating steel fiber reinforced concrete. To achieve the aforementioned objectives, experimental tests were conducted at the level of cement paste, cement mortar and self consolidating steel fiber reinforced concrete. The fresh state performance, fiber dispersion and orientation, and hardened state properties of SCSFRC was considered for a thorough evaluation of robustness. Fresh state performance was measured by means of the slump-flow and V funnel test. Fiber dispersion was measured in the fresh state by fiber washing and in the hardened state by a non destructive magnetic probe test with ferrite core. The hardened state properties of self consolidating steel fiber reinforced concrete were measured by means of flexural tests, compression tests, tensile splitting tests performed on the specimens from each mixes. Moreover, the results from the fresh state and hardened state properties were correlated.File | Dimensione | Formato | |
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https://hdl.handle.net/10589/8441