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effect of limestone composition and microstructure on the

13Feb 713

Phase composition, microstructure and properties of ...

The effect of La203-doping on the sinterability of Egyptian dolomite and limestone-derived lime on firing up to 1600°C was investigated. The La203/CaO ratios ranged between 0.4 and 1.5 mole% of the investigated materials. The composition of the phases formed on firing and the microstructures of the obtained grains were studied using chemical analysis, X-ray diffraction and reflected light ...

20Feb 529

Influence of gypsum and limestone, used as mineral ...

 · The impact of limestone and gypsum as additives on phase composition and properties of AAC was determined. In the initial study on the laboratory scale, influence of limestone on the microstructure of AAC was determined. Later, on a technical scale, properties such as compressive strength, dry density, thermal conductivity coefficient, drying ...

19Feb 934

(PDF) Effect of limestone aggregate type and water–cement ...

Effect of limestone aggregate type and water–cement ratio on concrete strength. ... The strength of rocks is closely related to their mineralogical composition. Ceyhan limestone is mainly composed of calcite crystals having occasional non-continuous fracture and Fe 2 O 3 content in the same fracture. ... The microstructure of concrete depends ...

18Feb 1219

Effect of limestone powder on mechanical properties and ...

In order to enhance the large-scale and high-quality application of limestone powder (LP) and phosphogypsum in the construction industry. Therefore, this paper mainly studies the effect of LP on the physical and mechanical properties of phosphogypsum-based composites, and clear the mechanism of action from the micro level. Based on the results, the conclusions were as follows: LP has the ...

1Feb 1939

The Effect of the Composition and Microstructure of Gray ...

 · The Effect of the Composition and Microstructure of Gray Cast Iron Brake Rotor on Squeal Noise. 2013-01-2031. The performance of brake system is dependent on the interaction between brake pad and rotor at the friction interface. The mechanical properties of the brake rotor that is made of gray cast iron are directly influenced by composition ...

11Feb 1542

Effect of MgO on the Composition, Structure and Properties ...

The influence of MgO on the composition, structure and properties of alite-calcium strontium sulphoaluminate cement were investigated by means of X-ray diffraction, SEM–EDS and light analysis. The results show that when the mass fraction of MgO is 1~5%, the early strength of cement can be enhanced significantly. The optimal content of MgO in the cement clinker is 2% and the compressive ...

24Feb 1991

Effect of strontium substitution on the composition and ...

 · The purpose of the present study is to examine the effect of Sr 2+ concentration on the composition and microstructure of calcium phosphates samples prepared by sol–gel chemistry. Sol–Gel process has been used because of its many advantages like the lower temperature involved in the preparation and the possibility to prepare materials as ...

29Feb 889

Effect of limestone powder in manufactured sand on the ...

In this paper, X ray diffraction test and Scanning electron microscope test were designed to investigate the effect of limestone powder (LP) in manufactured sand on the hydration products and microstructure of full recycled coarse aggregate concrete samples.

20Feb 1606

Effects of Alkali Treatment on the Microstructure ...

effect of alkaline treatment at room temperature on its microstructure, structure, composition, thermal behavior, mechanical properties, and color. To this end, slack raw fibers were soaked in three NaOH solutions (2.5%, 5%, and 10% by weight) for 12 hours. SEM observations revealed

24Feb 901

Investigation of porosity and permeability effects from ...

Investigation of porosity and permeability effects from microstructure changes during limestone dissolution Catherine Noiriel,1,2 Philippe Gouze,1 and Dominique Bernard3 Received 21 September 2004; revised 29 October 2004; accepted 17 November 2004; published 21 December 2004.

26Feb 550

(PDF) Investigations About the Effect of Aggregates on ...

Limestone and granitic coarse aggregates have the same Faury maximum dimension (9.52) and similar fineness modulus respectively 5.5 and 5.2. Schist sand has a lower maximum dimension (2.78) and a fineness modulus of 2.38. Mix proportion, strength testing and microanalysis of the bindersThe samples composition is shown in Table 4.

27Feb 969

Microstructural characterization of limestone exposed to ...

 · Highlights: • The microstructure of limestone (25 °C–800 °C) was analyzed by XRD, SEM and TG-DSC. • The microstructural properties of the crystal are anisotropic in different crystal plane directions. • Microstructure controls the macroscopic properties of limestone. - Abstract: Limestone ...

4Feb 839

Effect of Microstructure and Composition of Limestone ...

STP691 Effect of Microstructure and Composition of Limestone, Marble, Basalt, and Quartzite Aggregate on Concrete Durability in Presence of Solutions of Calcium Chloride and Magnesium Sulfate

22Feb 1233

THE EFFECT OF PALM OIL FUEL ASH (POFA) WITH …

THE EFFECT OF PALM OIL FUEL ASH (POFA) WITH LIMESTONE AS A PARTIAL CEMENT REPLACEMENT MATERIAL TOWARD CONCRETE MICROSTRUCTURE AND HYDRATION NUR AYNA BINTI AZMI Report submitted in fulfillment of the requirements for the award of the degree of Bachelor of Engineering (Hons) in Civil Engineering Faculty of civil Engineering and Earth Resources

19Feb 738

Effects of limestone petrography and calcite ...

Limestone represents the main raw material for ordinary Portland cement clinker production. In this study eight natural limestones from different geological environments were chosen to prepare raw meals for clinker manufacturing, aiming to define a parameter controlling the burnability. First, limestones were characterized by X-Ray Fluorescence, X-Ray Powder Diffraction and Optical Microscopy ...

7Feb 1084

THE MICROSTRUCTURE AND MECHANICAL PROPERTIES …

The limestone was purchased from Jinan city, Shandong Province, and was ground for 30 minutes. The mean diameter of the ground limestone is 8.26 μm, while the specific surface area is up to 574 m2∙kg-1. Table 1. The composition of the calcined clay and limestone (mass fraction/%). ComponentsCaOSiO 2 Al 2 O 3 K 2 O 2 O 3 FeTiO 2 LOI*

4Feb 764

Effect of limestone powder on microstructure of concrete ...

 · The effect of limestone powder on microstructure of concrete was studied by using mercury intrusion porosimetry (MIP), backscattering scanning electron(BSE), scanning electron microscopy (SEM) and X-ray diffraction (XRD) techniques. The experimental results show that the compressive strength of concrete containing 100 kg/m3 limestone powder can meet the strength …

27Feb 663

The Effects of Composition and Microstructure on the ...

The CoCrAlY contained HCP α-Co, β-CoAl, and a Co-rich yttride. The experimental conditions were: Type I and Type II hot corrosion, cyclic oxidation, and intermittent hot corrosion. The effects of alloy composition and microstructure on the resistance to these modes of degradation were determined using scanning electron microscopy and kinetic ...

25Feb 681

The effect of chemical composition on microstructure and ...

The effect of chemical composition on microstructure and properties of intercritically reheated coarse-grained heat-affected zone in X70 steels . Abstract . The current study investigates the effect of different levels of Ti, N, and Ti/N ratios on microstructure and

21Feb 860

Effect of sintering temperature of potassium feldspar ...

limestone (CaCO 3) and/or dolomite (CaMg(CO ) 2) as the additives, crystalline struc-ture breakdown of potassium feldspar is achieved by high‐temperature treatment and a K‐containing multi‐nutrient silicate fertilizer is thus produced. Effect of sintering temperature on the available nutrient contents, mineral phases, and microstructure

14Feb 1005

Effect of Limestone Addition on the Early Age Hydration ...

Limestone and slag exert physico-chemical effects on cement hydration and the resultant microstructure. In limestone containing cements, the carbonate species interact with the dissolved aluminates to form carboaluminates, thus stabilizing ettringite. Reaction of slag mainly produces

2Feb 1816

EFFECT OF TEMPERATURE ON THE STRUCTURE AND …

Keywords: Thermal treatment, Microstructure, Compressive strength, Fly ash and blended cement This study aimed to investigate the effect of heat treatment on microstructure and phase composition of pastes containing fly ash (FA) and limestone (LS). Two groups of cement pastes were prepared. In the first group, Portland cement (OPC) has been

6Feb 1503

Effect of Composition and Microstructure on the Seawater ...

Effect of Composition and Microstructure on the Seawater Corrosion Resistance of Nickel Aluminum Bronze. by Harold T. Michels, Copper Development Association Inc., and Robert M. Kain, LaQue Center for Corrosion Technology, Inc; Paper Number 03262 reproduced with permission from Corrosion/2003 Annual Conference and Exhibition, San Diego, California; ©NACE International.

30Feb 1421

Effect of limestone on rheological, shrinkage and ...

The effect of limestone powder (5%, 10% and 20%) on the rheological properties, drying shrinkage and mechanical properties of alkali-activated slag/fly ash grouting materials (AASFGM) are investigated. The results show that AASFGM with or without limestone powder …

25Feb 1188

Effect of chemical composition and microstructure on the ...

Effect of chemical composition and microstructure on the mechanical behavior of fish scales from Megalops Atlanticus. Gil-Duran S(1), Arola D(2), Ossa EA(3). Author information: (1)Production Engineering Department, School of Engineering, Universidad Eafit, Medellín, Colombia.

29Feb 1316

Influence of limestone content, fineness, and composition ...

 · The influence of the fineness, concentration, and chemico-mineralogical composition of limestone on the workability, reaction kinetics, compressive strength, microstructure, and binder gel characteristics of sodium carbonate–based waste-activated …

15Feb 1328

Effect of phase composition and microstructure on the ...

 · Zhang et al. investigated the effect of microstructure on the corrosion behaviour of an Al-5.4 wt% Ni alloy fabricated by equal-channel angular pressing (ECAP). They have found that the more homogeneous and finer α-Al/Al 3 Ni structure plays a vital role in improving the corrosion resistance of the Al-5.4 wt% Ni alloy.

28Feb 891

Effects of alkali treatment on the microstructure ...

Full Article. Effects of Alkali Treatment on the Microstructure, Composition, and Properties of the Raffia textilis Fiber Raymond Gentil Elenga, a, * Philippe Djemia, b David Tingaud, b Thierry Chauveau, b Jean Goma Maniongui, a and Guy Dirras b The Raffia textilis fiber has a specific strength of 660 MPa cm 3 /g and scales and hollows on its surface.

30Feb 937

Effects of limestone petrography and calcite ...

Later, when the melt appears this correlation vanishes; however differences in the early burnability still reflect on the final clinker composition and texture. Effects of limestone petrography and calcite microstructure on OPC clinker raw meals burnability / M. Galimberti, N. Marinoni, G. Della Porta, M..I. Marchi, M. Dapiaggi.

11Feb 1789

[PDF] THE MICROSTRUCTURE AND MECHANICAL PROPERTIES …

Limestone, calcined clay and cement (LC) are one of the low carbon cement materials which are used as a partial substitution of clinker and Portland cement. In this study, the effects of limestone and calcined clay (LC) on the mechanical properties and microstructure of mortars were studied under multi-scales. It could be concluded that the compressive strength decreased slightly with an ...

15Feb 1282

Effects of limestone petrography and calcite ...

 · Soltan et al. pointed out how the fossil content and the parent calcite microstructure in grainstones reflect on the reactivity of the derived lime; furthermore, the mineralogical and chemical composition has been proved to be the main controlling variable on the reactivity of mud-supported limestones even after calcination (Soltan et al. 2012 ...

7Feb 1898

Study on Strength and Microstructure of Cement Pastes ...

 · The strength and microstructure of the pastes after different flowing acid attack periods were investigated by using strength test, X-ray diffraction (XRD), and scanning electron microscopy (SEM) techniques in this study, which reveals the effect of limestone powder on flowing acid resistance mechanism of cement paste.

22Feb 1378

Investigations about the effect of aggregates on strength ...

Limestone and granitic coarse aggregates have the same Faury maximum dimension (9.52) and similar fineness modulus respectively 5.5 and 5.2. Schist sand has a lower maximum dimension (2.78) and a fineness modulus of 2.38. 2.2. Mix proportion, strength testing and microanalysis of the binders The samples composition is shown in Table 4. In this

30Feb 1359

The Effect of Ground Limestone Addition on Carbonation …

saturated material the effect of the humidity can be avoided thus enabling the resistivity to be related mainly to the microstructure of the material (assuming that the composition of the pore solution does not significantly change in the different concrete). 30 40 50 60 70 80 90 0 10 20 30 40 Limestone content (% vs binder) Compressive ...

27Feb 990

Effects of limestone petrography and calcite ...

Then, each limestone was admixed with clay minerals to achieve the adequate chemical composition for clinker production. Raw meals were thermally threated at seven different temperatures, from 1000 to 1450 °C, to evaluate their behaviour on heating by ex situ X-Ray Powder Diffraction and to observe the final clinker morphology by Scanning ...

20Feb 1063

The Effect of Limestone Filler on the Properties of Self ...

composition and specific surface according to Blaine method) is given in Table 1.The composition of concrete mixtures is given in Table 2. Table 1. Chemical composition of microfillers and Blaine specific surface. Limestone powder Fly ash Component L-1 L-2 FA SiO2 1,35 0,13 52,77 Fe2O3 0,50 0,20 7,32 Al2O3 0,46 0,20 24,98 CaO 51,60 52,38 3,42

22Feb 635

Influence of microstructure on replacement and porosity ...

 · This study focused on understanding the effects of initial starting material permeability and resultant differences in transport pathways on porosity and mineralogical changes during limestone dolomitization.A series of replacement experiments (32–317 days in duration) have been conducted in which 1.59 cm (5/8 in.) diameter cores of two ...