Influence of cementitious additions on rheological and mechanical properties of reactive powder concretes

Zenati, Abdelfetah; Arroudj, Karima; Lanez, M.; Oudjit, Mohamed Nadjib

doi:10.1016/j.phpro.2009.11.089

Cited by 19 publications

(14 citation statements)

References 3 publications

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“…The results also show that the rheological behavior is influenced by the proportion of superplasticizer. Optimized constant proportion of plasticizer is about 1.8 % though the flow times remain very high at this proportion [16]. Mechanical properties of RPC produced with class-C fly ash (FA) and GGBFS were investigated under different curing conditions (standard, autoclave and steam curing) by HalitYazici.…”

Section: Influence Of Curing Conditionsmentioning

confidence: 99%

A State of the Art Report on Ultra High Performance Concrete: Reactive Powder Concrete

Bhusari¹,

S²

2017

IOSR JEN

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Abstract:-There has been continuous demand for materials with higher compressive strength for various civil engineering applications. Reactive powder concrete (RPC) has been developed to overcome the weakness of most high strength concrete available with compressive strength in the range of 60-100 MPa. RPC was developed from a special combination of constituent materials such as Portland cement, silica fume, quartz flour, fine silica sand, high-range water-reducer, water and steel fibers wherein attempts have been made to remove the coarse aggregate particles to make a very strong mortar with a very low water cement ratio. This paper presents a state of the art report reviewing the research in the area of the development of RPC, highlighting the enhanced performance in the mechanical properties of RPC in direct application of its use in structural members requiring high standards of strength coupled with superior performance and durability.

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Section: Influence Of Curing Conditionsmentioning

confidence: 99%

A State of the Art Report on Ultra High Performance Concrete: Reactive Powder Concrete

Bhusari¹,

S²

2017

IOSR JEN

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“…Scanning electron micrographs of dune sand show that its structure is formed by amorphous fine particles adsorbed on large crystallized particles. However silica fume is in the form of agglomerates of microspheres with an average diameter D = 0,136 μm, which is given by the following relation [9]: 6 s D Ad = where: (D): the average diameter in μm; (A) and (ds): the specific area (fineness) in m 2 /g and the density of silica fume respectively For UHPC, Polycarboxylate based superplasticizer with a density of 1.07 g/cm 3 and dry extract of 30% was used. The coarse aggregate contains the dune sand with particle size lower than 0.63 mm.…”

Section: Sio2mentioning

confidence: 99%

“…In addition, the south of the country is rich in dune sand. This motivate the use of the two both materials as cementitious addition in UHPC [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Reactivity of Fine Quartz in Presence of Silica Fume and Slag

Arroudj¹,

Zenati²,

Oudjit³

et al. 2011

ENG

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Dune sand is a very abundant material in south of Algeria. Its high silica content gives a partial pozzolanic reactivity due to its crystalline state. This paper investigates the evolution of cement hydration based on a binary addition particularly the reactivity of dune sand finely ground in the presence of an amorphous addition: silica fume or blast furnace slag. Thus, four combinations of binary additions by substitution have been chosen. The X-ray diffraction analyses performed on cement pastes containing additions have shown the importance of the mineralogy and silica content of additions on their pozzolanic reactivity. Dune sand becomes reactive at long term, especially when associated up to 10% of amorphous addition (blast furnace slag or silica fume). It results an increasing in mechanical strength of Ultra High Performance Concrete (UHPC) and an improvement of the microstructure

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“…In addition to the mixing technology, the use of reactive material and curing technology can improve concrete performance. Reactive powder concrete (RPC) is classified as an ultra-high performance concrete (UHPC) (Zenati et al 2009) which has a compressive strength of 200 MPa when applying heat curing and up to 800 MPa when using steel aggregate (Richard 1995). In the RPC compositions, active powders dominate as the main constituents to obtain a relatively dense and homogenous microstructure (Yu et al 2014, Zang et al 2008, Yasici et al 2013.…”

Section: Introductionmentioning

confidence: 99%

Influence of Intensive Vacuum Mixing on the Compressive Strength of RPC Containing Secondary Slag as Cementitious Material

Edwin¹,

Gruyaert²,

Dils³

et al. 2016

Sustainable Construction Materials and Technologies (SCMT)

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This research investigates the influence of intensive vacuum mixing on the compressive strength of reactive powder concrete (RPC) containing secondary slag as cementitious material. The quickly cooled granulated copper slag (QCS) was ground intensively using a planetary ball mill. A low water-to-binder ratio of 0.185 was chosen for the RPC in this study. Various concrete and cement paste samples were produced with increasing copper slag contents from 0 to 20 wt.% in steps of 5 wt.%. Particle size distribution (PSD) and specific surface area (SSA) of the secondary slag were assessed using laser diffraction and the Blaine permeability test, respectively. The RPC mixes were evaluated on workability, density, and compressive strength. In order to obtain a homogenous mixture and improve the performance of RPC, a high speed mixer with vacuum was applied. The performance of RPC was assessed under vacuum conditions (100 mbar) as a comparison to that of the atmospheric pressure (1013 mbar). The microstructure of RPC was investigated by a scanning electron microscopy (SEM). The pozzolanic activity of QCS was determined by the Frattini test. At 28 days, the strength of RPC with copper slag prepared under 100 mbar was better than the reference (containing no copper slag). In contrast, the strength of RPC containing copper slag mixed under 1013 mbar was lower than the reference. Results also showed that 10% copper slag replacement for OPC under vacuum conditions gave the highest compressive strength. There is a slight increase in the RPC density under 100 mbar compared to the RPC density under 1013 mbar. The workability of fresh RPC under atmospheric pressure was higher than that of the fresh RPC under vacuum conditions. Assessment of the pozzolanic activity by means of the Frattini test indicates pozzolanic reaction of the secondary slag after curing for 15 days.

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Influence of cementitious additions on rheological and mechanical properties of reactive powder concretes

Cited by 19 publications

References 3 publications

A State of the Art Report on Ultra High Performance Concrete: Reactive Powder Concrete

A State of the Art Report on Ultra High Performance Concrete: Reactive Powder Concrete

Reactivity of Fine Quartz in Presence of Silica Fume and Slag

Influence of Intensive Vacuum Mixing on the Compressive Strength of RPC Containing Secondary Slag as Cementitious Material

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