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effects of nigerian limestone and superplasticizer on

Rheological and Mechanical Characteristics of Self- Compacting Concrete ...

the dosage of superplasticizer needed to obtain similar slump flow compared to concrete made with Portland cement only. Ede and Adegbite (2014) in their study on the rheological properties of developed SCC using various dosages of limestone powder and super-plasticizer confirmed that limestone powder can be used to enhance the

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limestone and gritsand ratio for concrete - villagoofy

How to Mix Portland Cement With Sand Hunker. Portland cement is made up of a number of compounds, but primarily consists of limestone and clay It can be mixed with water, sand and other materials for use in building and sculpting projects Portland cement is so named because the color of the cement is akin to the limestone from the Isle of Portland in the English Channel...

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A Comparative Study on Egg Shell Concrete with Partial ... - IJERT

Conplast SP430 was used as a superplasticizer. It is a chloride free, super plasticizing admixture. It was supplied as a brown solution which instantly disperses in water. Concrete Mix Design. Mix proportion used in this study was 1:1.61:2.65 (M40) conforming to IS 10262-2009 with water-cement ratio of. 0.4 and superplasticizer of 0.75%. Mix ...

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Cement Replacement Materials (CRM) in Concrete - Structville

Jan 20, 2021In the study of Lomboy et al (2016), the effect of limestone fines replacement of cement is shown below. ... In a 2009 study carried out in Nigeria, the effects of partial replacement of concrete with RHA is shown ... the use of ground POFA in the concrete required slightly higher amounts of superplasticizer than those required by the control ...

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What is the Special Properties of Nitinol - In Win Development

its expansion rate is more than 20%, its fatigue life is up to 1*10 to the 7th power, its damping characteristics are 10 times higher than that of ordinary springs, and its corrosion resistance is better than the current best medical stainless steel, so it can meet various engineering and it is a very excellent functional material for medical .

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DESIGN, PRODUCTION AND PLACEMENT OF SELF-CONSOLIDATING By Kamal Henri ...

DESIGN, PRODUCTION AND PLACEMENT OF SELF-CONSOLIDATING CONCRETE: PROCEEDINGS OF SCC2010, MONTREAL, CANADA, SEPTEMBER 26-29, 2010 (RILEM BOOKSERIES) By Kamal Henri Khayat, Dimitri Feys - Hardcover.

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Optimization of ultra-high performance concrete, quantification of ...

superplasticizer content, coarse-to-fine aggregate ratio and steel fiber volume frac-tion. The values of packing density, water film thickness and excess paste film thickness were calculated considered in the optimization experimental program. The trends in the effects of packing density, water film thickness and excess paste film

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Effects of Calcium Carbonate Admixture from Common Cockle Shell

In the study of Li, Huo, and Du (2018), limestone is used as a mineral admixture in concrete. As stated in the article from the International Plant Nutrition Institute, Limestone contains approximately 40% calcium carbonate. But using this material may have a negative effect to the environment.

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Evaluation of the Effects of Different Additives on Compressive ... - IMIST

plasticizer, air entrainment, and superplasticizer) and amount (5.7%, 7.7%, and 9.5% of the total mass). The results show that all factors had a significant influence on the variable response. For example, the use of the superplasticizer additive resulted in higher compressive strength, lower density,

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Properties of concrete with binary binder system of calcined dolomite ...

This behaviour is attributed to the porosity of RHA, whose particles contain macro-and meso-pores inside and on the surface, resulting in a very large specific surface area. Subsequently, a greater amount of water is required to wet this large surface area, resulting in a decrease in free water, a lower slump, and the water/binder ratio.

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Data on effect of a reducer of water and retarder of setting time ...

This experiment has achieved using the Vicat apparatus according to the standard (EN 197-1) [2 x [2] Khudhair, M.H.R., El Youbi, M.S., and Elharfi, A. Effect of partial substitution of clinker by limestone fillers: study of its influence on the physical-chemical properties and the mechanical performance. Moroc. J. Chem. 2017; 5: 153-163

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Investigation on Palm Kernel Ash as Partial Cement Replacement in High ...

effect of this Superplasticizer admixture is its high range water reducing at equal consistency. It is a dark brown coloured liquid complying with BS 5075 part III and ASTM-C 494 Type F (as provided by the manufacturer). The specific gravity is 1.19±0.01 kg /l at 20°C and solid content is 43% by mass.

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(PDF) Experimental Study of Conplast SP430 in Concrete ... - ResearchGate

Consequently, this study involves the application of Conplast SP 430 Superplasticizer on three different cement brands in northern part of Nigeria. The same Grade 42.5N of the three cements were ...

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Effects of Environmental Factors on Concrete Carbonation Depth and ...

2.1. Raw Materials. The P + O 42.5 Portland cement was provided by China Building Materials Academy. The fly ash produced by Hunan Xiangtan Power Plant was low calcium fly ash (i.e., F class). The physical properties of cement and fly ash are listed in Table 1, and the chemical compositions of fly ash are listed in Table 2.River sands and continuous grading limestone gravels with a grain size ...

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Effect of Nano Titanium Dioxide on Properties of Epoxy Resin coating

Effect of TiO2 nanoparticles on hardness of Epoxy Resin With the increase of filler content, the hardness of epoxy resin increased at first, and then remained basically unchanged. When the content of nano-TiO2 is 5%, the hardness is 91.3, which is 16.7% higher than that of pure epoxy resin.

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Mechanical and microstructural properties of high-performance concrete ...

high dosage of superplasticizer (Faleschini et al., 2015; Harbec et al., 2017). Utilised materials are typically carefully selected, high-quality constituents with an optimised mix design. The aggregates should be robust, durable, and compatible with cement paste in rigidity and strength (Aitcin, 2004).

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The Application of Response Surface Methodology in ... - SpringerLink

It becomes pertinent to improve the performance of sandcrete blocks with the use of eco-friendly material because it is the conventional walling unit system in Nigeria. This study evaluates the presence of calcined clay as a locally sourced material in producing hollow sandcrete blocks, using the Box and Behnken Design of Response Surface Methodology as experimental design. The design ...

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Effect of Clay Fines on the Behavior of Self-Compacting Concrete

The technology of concrete has significantly increased in recent years through the use of superplasticizer and availability of mineral additions. ... Following this study, it was found that the powder addition reduce heat of hydration compared to limestone addition. A decrease of 7.2% was recorded after 120 hours, whereas before 24 hours ...

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The Effect of Superplasticizer - EDULOC

The Effect of Superplasticizer. May 20,2022; ... Bloomberg said, recently, according to a draft EU file, African countries, especially in western Africa Nigeria, Senegal and Angola have a large untapped liquefied natural gas (LNG), the European Commission will adopt this file about enhanced external energy supply later this month, as part of ...

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Optimization of ultra-high performance concrete, quantification of ...

trends in the effects of packing density, water film thickness and excess paste film thickness on compressive strength and fresh mix flow were investigated. The results were used to identify viable ranges of these defining characteristics for the category of UHPC. Response surface analysis of the fresh mix flow and the hardened concrete

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Main Features of Inconel625 - pingsnyc

Russia and Ukraine is an important exporters of oil, natural gas, metals, fertilizers, rare gases and other industrial raw materials. Affected by the further intensification of the tension of the war, the global market has become more worried about the supply of the Inconel625, and panic spreads in the futures market.

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Welcome to Dangote Cement Plc - We are an Integrated Cement Business in ...

Our vision is for West and Central Africa to be cement and clinker self-sufficient, with Nigeria the main export hub. Dangote Cement is focusing on an 'export to import' strategy in West and Central Africa. Nigeria has a relative abundance of quality limestone especially in key southern regions near to demand centers and export facilities.

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Some Structural Performance Evaluation of Concrete Reinforced With ...

brunch fibre (OPE-FBF), and potable water. The cement used was Portland limestone cement of 42.5 grade satisfying the requirement of requirements NIS 444 (2014) and BS EN 197-1 (2000). The fine aggregate used was river sand which was obtained from a River FUOYE flowing adjacent to the Ikole Campus of the Federal University, Oye-Ekiti, Nigeria.

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Graphene Properties and Graphene Uses - nhlhotstove

Graphene is a two-dimensional crystal, which consists of carbon atoms with sp2 hybrid orbitals to form two-dimensional carbon nanomaterials with hexagonal honeycomb lattice.

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RESEARCH PROJECT MATERIALS - Project Topics for Student

EFFECTS OF NIGERIAN LIMESTONE AND SUPERPLASTICIZER ON THE HARDENED PROPERTIES OF SELF COMPACTING CONCRETE, STUDY OF REED-BED OF AN URBAN WASTEWATER IN A NIGERIAN COMMUNITY, UNIQUE SHAPED STRUCTURES: MODELLING, DESIGN AND VERIFICATION OF A WATER DROP-SHAPED BUILDING,

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Graphene Properties and Graphene Uses - krissyskage

Graphene is a two-dimensional crystal, which consists of carbon atoms with sp2 hybrid orbitals to form two-dimensional carbon nanomaterials with hexagonal honeycomb lattice.

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Graphene Properties and Graphene Uses - integra927

Graphene is a two-dimensional crystal, which consists of carbon atoms with sp2 hybrid orbitals to form two-dimensional carbon nanomaterials with hexagonal honeycomb lattice.

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Effect of Superplasticizer on Workability and Properties of Self ...

[1] concluded from the result gotten from the fresh and hardened properties of effect of superplasticizer at 0.25, 0.30 and 0.35% with 10% fly ash as a mineral admixture in replacement of cement, that increase of the superplasticizer dose lead to marginal reduction in unit weight but addition with gaining self-compatibility of the mixes.

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Formulation Et Caractérisation Des Mortiers Autoplaçants À Base De ...

Moteur de recherche des thèses et mémoires soutenus en Algerie

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Evaluation of Fresh and Hardened Properties of Self-Compacting Concrete

3.2. Hardened Concrete Properties. The average densities and compressive strengths of SCC and conventional concrete (Control) specimens are presented in Table 3 and Table 4 respectively; while their graphical illustrations are presented in Figure 5 and Figure 6 respectively. The same mean density of 2500 kg/m 3 was obtained for the control and SCC-2 mixes, while that of SCC-1 was 2510 kg/m 3 ...

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Effects of limestone and super-plasticizer on the fresh ... - IISTE

influence of limestone powder and High Range Water Reducing Super plasticizer on the fresh properties of SCC, is considered. For the flow-ability, slump test was adopted, for passing ability, L-box test is used and for the, viscosity/fluidity, V-funnel test is executed. 2. Materials and Methods,

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Role of Gypsum in Cement and its Effects - The Constructor

Effects of Gypsum on Cement Gypsum prevents Flash Setting of cement during manufacturing. It retards the setting time of cement. Allows a longer working time for mixing, transporting and placing. When water is mixed to cement Aluminates and sulfates get react and evolve some heat but gypsum acts as coolant and brings down the heat of hydration.

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Effect of limestone filler content and superplasticizer dosage on ...

Effect of limestone filler content and superplasticizer dosage on rheological parameters of highly flowable mortar under light pressure conditions Cement and Concrete Research, 2010 Eric Wirquin

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Characteristic and Effects of A Superplasticizer Quantity Variation in ...

This study investigates the properties of superplasticized concrete and compared results to that of normal concrete. Four different concrete proportioning of 1:2:3 mix ratio have been considered. A0 is normal concrete having 0.4 water cement ratio (w/c) and is the control while A1, A2 and A3 are superplasticized concretes having 0.3 water cementitious materials ratio (w/cm) with varied ...

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Limestone calcined clay cement and concrete: A state-of-the-art review ...

Nov 1, 2021Effect of fineness in clinker-calcined clays-limestone cements. M. Leng, A. Georges, Alujas Diaz Adrian, M. Fernando, Scrivener Karen Louise. Materials Science. 2015. This paper looks at the effect of fineness of the different components in a blend containing 55% Portland cement, 30% calcined clay and 15% limestone.

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Study on the Effect of Varying Temperature of Viscosity ... - IJERT

It is associated with dose and kind of superplasticizer and its temperature resistance in terms of workability. It is also associated with cement type and kind of superplasticizer. In this case, the effect of varying temperature of V.M.A on the properties of fresh self-compacting concrete need to be investigated. 2.0 LITERATURE REVIEW

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The Effect of Superplasticizer - EDULOC

May 20, 2022The experimental results show that when the addition amount of FDN superplasticizer increases from 0.25% to 0.5%, the 3D compressive strength increases from 21.1mpa to 28.9mpa, with a growth rate of 36.9%. The 7d strength increased from 35.6MPa to 44.8MPa, with an increased rate of 25.8%. The 28d strength increased by 13.6% from 51.4MPa to 58.4MPa.

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Performance of Millet Husk Ash in Self Compacting Concrete

Portland Limestone Cement (CEM II/A-L) of grade 42.5 N manufactured by BUA, Nigeria was used in this study. The oxide composition and physical properties of the cement is presented in Table 1 and 2. 2.1.2 Millet husk ash (MHA) The millet husk was collected from a dump site around a farmland in Kano State, Nigeria and burned to

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Evaluation of the Effects of Different Additives on Compressive ... - IMIST

example, the use of the superplasticizer additive resulted in higher compressive strength, lower density, lower air void, and lower thermal conductivity while the use of additives had little influence on the response variables in relation to the other factors. Al-adili [14] examined the effect of different additives

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USE of GUM Arabic as a Superplasticizer in Self- Compacting Concrete

Limestone Filler Limestone filler was purchased from Mineral Enterprises Limited located in Athi river, kenya. It had 85% calcium carbonate, water demand of 38% and bulk density of 1381 Gum Arabic Gum Arabic for this study was obtained from farms in Isiolo, Northern Kenya. Chemical Superplasticizer

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