Effect of polycarboxylate and crushed quartz in UHPC: Microstructural investigation

Courtial, Mireille; Noirfontaine, Marie‐Noëlle de; Dunstetter, F.; Signes-Frehel, M.; Mounanga, Pierre; Cherkaoui, Khalid; Khelidj, Abdelhafid

doi:10.1016/j.conbuildmat.2013.03.077

Cited by 50 publications

(21 citation statements)

References 21 publications

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“…The new generation is Polycarboxylates (PCE) referred to as High Range Water Reducers (HRWR) or superplasticizers. These superplasticizers are the most used in concrete industry and also the most studied in academic field [3,[7][8][9][10][11]. In fact, the structure diversity of polycarboxylates allows various combinations of macromolecular parameters, which involves important modifications of their efficiency.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of phosphonated comb-like copolymers and evaluation of their dispersion efficiency on CaCO3 suspensions. Part I: Effect of an increasing phosphonic acid content

Tramaux¹,

Azéma²,

David

et al. 2018

Powder Technology

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Superplasticizers are admixtures widely used in the building industry for reducing the water content of concrete with a high fluidity and workability at short term, and for increasing concrete mechanical properties at long term. Polycarboxylates, which are synthetic comb-like copolymers, are the most used superplasticizer admixtures. In order to improve polycarboxylate efficiency and compatibility with use of mineral additives, high-sulfate concretes etc., various authors tried to change macromolecular architectures, including nature of anionic function. This paper is the first part of a study which presents synthesis of several macromolecular architectures of comb-like copolymers with phosphonic acid functions instead of classical carboxylic acid. Adsorption, dispersion and fluidification efficiency of these admixtures are evaluated on calcite suspensions in order to simulate earlyage cement behavior. Moreover, settling behaviors are studied in order to characterize dispersion ability of synthetized polymers.

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Section: Introductionmentioning

confidence: 99%

Synthesis of phosphonated comb-like copolymers and evaluation of their dispersion efficiency on CaCO3 suspensions. Part I: Effect of an increasing phosphonic acid content

Tramaux¹,

Azéma²,

David

et al. 2018

Powder Technology

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“…In the case of UHPFRC, polarized microscopy showed coloration differences around aggregates and fibers. This could have been produced by a preferential location of quartz fine fractions, as reported in some publications [24], but no ITZ in the cement paste has been detected. This is coherent with the bibliography, which indicates the ITZ of UHPFRC as denser and have negligible transport properties [5].…”

Section: Discussionmentioning

confidence: 66%

Interfacial Transition Zone in Mature Fiber-Reinforced Concretes

Roig-Flores¹,

Šimicevic²,

Maričić³

et al. 2018

ACI Materials Journal

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“…Surface chemical effect: when the particles add and improve hydration by acting as a part of paste and make more specific area [34]. And for sure, by adding quartz in presence of some SF, a new grain size between SF grain sizes and cement grain sizes will fill the holes specially when quartz crushed powder particles distributed homogeneously [35].…”

Section: к л юч е вы е с л о ваmentioning

confidence: 99%

“…Chemical effect: when the particles add and react with calcium hydroxide in the cement and make calcium silicate (surface area is the most important factor in quartz powder particles so they should be finer than 5 micron to act as a pozzolan in concrete). But in this step the quartz powder needs autoclave cure with above 90 °C temperature to react as a pozzolan [35], which is not realistic in huge amounts of concrete like foundations or columns in buildings.…”

Section: к л юч е вы е с л о ваmentioning

confidence: 99%

Effect of quartz powder and mineral admixtures on the properties of high-performance concrete

2019

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Introduction. This study focuses on the use of silica fume partially replacing cement with 0, 5, 7.5, 10, 12.5 and 30 % constant replacement of fly ash by weight of cement in concrete. Concrete is probably the most extensively used construction material in the world. But the conventional concrete is losing its uses with time and high-performance concrete (HPC) is taking that place. HPC has superior mechanical properties and durability to normal strength concrete. Because of, the microstructure of HPC is more homogeneous than that of normal concrete (NC) due to the physical and chemical contribution of the mineral admixtures as well as it is less porous due to reduced w/c ratio with the addition of a superplasticizer. The inclusion of additives helped in improving the properties of concrete mixes due to the additional reduction in porosity of cement paste and improving the particle packing in the interfacial transition zone (between cement paste and the aggregates).In this experimental investigation the behavior of HPC with silica fume and fly ash with and without quartz powder were studied. The water-binder ratio was kept 0.3 and 20 % quartz flour as partial replacement of fine aggregate for all cases. Materials and methods. Used materials in Vietnam, as follow, Sulfate-resisting Portland cement - PCSR40 (type V) of company Luks Cement (Vietnam) Limited was used in the work. Crushed granite of fraction 9.5…20 mm - as coarse aggregate, Natural sand from Huong river of 0.15…2.5 mm fraction with the fineness modulus of about 3.0 and quartz powder with an average particle size of 5…10 μm were used as fillers; Sika® Viscocrete®-151 is a superplasticizer based on a blend of 3rd generation PCE polymers was used as a plasticizing admixture. The ﬂg ash from Pha Lai thermal power plant and Sika silica Sikacrete® PP1 (particle size < 0.1 μm) was used as a mineral active admixture. The study of strength and technological properties of high-performance concrete was performed by using standard methods. Results. Established by icate that, the workability and strength increase at a certain level and after that, they decline with further increase in the replacement level of silica fume is 12.5 %, on the basis of 30 % FA replacement, the incorporation of 10 % SF showed equivalent or higher mechanical properties and durability compared to the reference samples. Conclusions. HPC consists of mineral admixtures such as silica fume and fly ash use combine quartz powder and superplasticizer helped in improving the strength and durability of concrete mixes due to the additional reduction in porosity of cement paste and an improved interface between it and the aggregate. With 30 % fly ash is optimum dosage used to replacement of cement, incorporation 10 % SF (by weight) and combine of partial replacement of fine aggregate by 20 % quartz powder. On the other hand, a few mathematical equations can be used to derive the durability properties of concrete based on its compressive strength.

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Effect of polycarboxylate and crushed quartz in UHPC: Microstructural investigation

Cited by 50 publications

References 21 publications

Synthesis of phosphonated comb-like copolymers and evaluation of their dispersion efficiency on CaCO3 suspensions. Part I: Effect of an increasing phosphonic acid content

Synthesis of phosphonated comb-like copolymers and evaluation of their dispersion efficiency on CaCO3 suspensions. Part I: Effect of an increasing phosphonic acid content

Interfacial Transition Zone in Mature Fiber-Reinforced Concretes

Effect of quartz powder and mineral admixtures on the properties of high-performance concrete

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