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mechanical behaviour of portland cement mortars with

Mechanical Fracture Properties of Cement Mortars with Diatomite in ...

The paper is focused on the mechanical fracture properties of hardened cement mortars in which Portland cement is partially replaced by reactive admixtures. These properties are evaluated in relation to the mortars' microstructure through the size and content of pores. The cement in the mortars was partially replaced by a diatomite that contains amorphous SiO2.

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MECHANICAL PROPERTIES OF CEMENT MORTAR WITH GRAPHENE OXIDE - Exeley Inc.

The paper presents the studies on the mechanical properties of cement mortar reinforced with the 0.03 wt.% of graphene oxide (dosage by weight of cement). Graphene oxide proved to accelerate the cement hydration, in particular at the early stages of mortar hardening, hence improving the mortar performance during mechanical tests.

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Corrosion Behavior of AISI 1018 Carbon Steel in Localized ... - MDPI

repairs are repair mortars commonly made with ordinary Portland cement (OPC) mortars, engineered cementitious composites (ECC), with pozzolanic additions such as fly ash (FA) or silica fume (SF). Several tests have been carried out to evaluate only the mechanical behavior [23-25], and under

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Mechanical Properties of Alkali-Activated Slag Fiber Composites Varying ...

Each specimen mixed with PVA fibers showed strain-hardening behavior due to multi-microcracks, and all the specimens showed a high tensile strain of over 2.0 %. Such a result can be explained by the stress performance index, which is the ratio of the initial crack stress to the tensile stress.

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Characterizing and Modeling the Mechanical Properties of the Cement ...

Cement mortar with fly ash usually has retardation of hydration and delay of setting time due to the presence of SO −2 ions in the fly ash surface; with lower w/c, mortar usually has higher strength due to the presence of many cement hydrates [ 4 ]. Several studies have shown that the fly ash is effective for improving various properties of mortar.

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CiteSeerX — Mechanical behaviour of Portland cement mortars with ...

Mechanical behaviour of Portland cement mortars with incorporation of (1999) Cached. Download Links [repositorium.sdum.uminho.pt] ... {D. A. Pereiraa and Barroso De Aguiarb and F. Castroc and M. F. Almeidad and J. A. Labrinchae}, title = {Mechanical behaviour of Portland cement mortars with incorporation of}, year = {1999}} Share. OpenURL .

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Effect of a partial replacement of Portland cement by date seeds on the ...

substitution of a quantity of Portland cement by Date Seeds (DS) powder on the mechanical strength, setting time and durability towards acid environment elaborate mortars. Moreover, we will compare the behavior of prepared mortars with only cement (CEM II 32.5 N) and the mortars containing different dosages of DS.

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Revealing the dependence of the physiochemical and mechanical ...

The microstructure and mechanical properties of the GO-cement mortar have been studied by Lv et al.5 and the results showed that the inclusion of GO in the cement mortar results in enhancements in its tensile, compressive, and flexural strengths through formation of the flower-like hydration crystals.

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Mechanical Properties of Alkali-Activated Slag Fiber Composites Varying ...

Similar to ordinary Portland cement, alkali-activated ground granulated blast furnace slag (GGBS) also has hydraulic reaction characteristics so that hardened alkali-activated GGBS mortars have the mechanical characteristics of high strength at early and long-term ages, and are known to exhibit advantages such as a high resistance to chemical ...

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Mechanical behavior and durability of latex modified mortars - CERIST

manufacture of control mortars was 1/2. This ratio was validated after the mechanical strength test of two mortars with two different ratios (W/C) equal to 0.5 and 0.55. The results of the mechanical behavior, at 60 days, are summarized in Table 5. The values shown

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The Influence of Water/Binder Ratio on the Mechanical Properties of ...

Aug 16, 2021The Influence of Water/Binder Ratio on the Mechanical Properties of Lime-Based Mortars with White Portland Cement . by Dejan Vasovic *, Jefto Terzovic, Ana Kontic ... Alvarez, J.I. Masonry repair lime-based mortars: Factors affecting the mechanical behavior. Cem. Concr. Res. 2003, 33, 1867-1876. [Google Scholar] Lawrence, M. A Study of ...

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Effect of Nanosilica on Mechanical and Microstructural ... - IISTE

ASTM C 150 Type I Portland cement was used in this study. The chemical composition of Portland cement used in the preparation of mortar specimens is shown in Table 1. The fine aggregate used in this study was dune sand. The specific gravity of the fine aggregate was 2.56, and the absorption was 0.4%.

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Effect of a partial replacement of Portland cement by date seeds on the ...

Mechanical strength The changes in mechanical properties of Portland cement mortars due to the addition of ground date seeds (DS) to the mix have been studied. Compression has been determined in relation to the amount of biomass material added to the mix.

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Improvement of Mechanical Behavior of Rubber-Cement Mortars by ...

Oct 10, 2021After 28 days, the control cement reaches a compressive strength of 52 MPa; meanwhile, the catalyzed composite incorporating 10% by weight rubber scrap and 2.5% by weight of silica fume withstands a compressive strength of 61 MPa. Without a catalyst, the same material tolerates just 40 MPa. Access content Please select your options to get access

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Improvement of Mechanical Behavior of Rubber-Cement Mortars by ...

Oct 1, 2021After 28 days, the control cement reaches a compressive strength of 52 MPa; meanwhile, the catalyzed composite incorporating 10% by weight rubber scrap and 2.5% by weight of silica fume withstands...

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Behavior of blended cement mortars containing nano-metakaolin at ...

Mechanical behavior of activated nano silicate filled cement binders S. Shebl, L. Allie, M. Morsy, H. Aglan Materials Science, Engineering 2009 This investigation aimed to develop structural blended cement pastes with high mechanical properties for building envelope purposes. The effect of nano silicate (NS) replacement on the properties of. 64

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Interlacing the evaluation of mechanical properties of mortar cement ...

The developed models have a high relationship between the predicted values of compressive strength and the reference values of compressive strength. The r2 values for the PLS models are more significant than 0.990, which means that the behavior of the dependent variable is primarily explained by the behavior of the independent variable under study.

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The Effect of Molar Ratios of the Monomers on the Physico-Mechanical ...

that of ordinary Portland cement. Key words:Copolymer Portland cement mortar Water consistency Setting time Combined water Compressive strength INTRODUCTION increased durability, greater fatigue strength and A large amount of technical literature is available on mortar and concrete [9-12]. The workability of the fresh the behavior of Portland ...

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Effect of Nano-clay on Mechanical Properties and Microstructure of ...

Materials Science, Engineering — The effect of nano-clay on the mechanical properties and microstructure of Portland cement mortar was investigated. The main objective of this research is to constitute a blended cement mortar with high mechanical properties. The nano-clay used in this investigation was nano-kaolin.

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Fabrication and Mechanical Behavior of Portland Cement Mortars ...

Feb 17, 2022The mechanical results found revealed a systematic reduction of the maximum mechanical resistance by increasing the volume of Ichu fibers added in the studied mortar mixtures, on the other hand, a...

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Spatial distribution of mechanical and electrical properties of cement ...

Abstract The hardness was found to be lower (by {approximately}10 in Rockwell H scale) and the volume electrical resistivity was found to be higher (about doubled) at the edge (up to a depth of {approximately}5 cm for curing at 100% relative humidity) than at the center of a cement mortar specimen prior to loading.

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Determination of The Mechanical Properties of Cementitious Mixtures ...

This model allows the prediction of the global mechanical behavior of the mortars based on the ... For the formulation of mortars, a Portland cement CEM I 52.5N has been used. It is composed of over

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MECHANICAL BEHAVIOR OF THERMAL MORTARS WITH EXPANDED ... - ULisboa

industrial and another traditional cementitious mortars, were produced in the laboratory with the purpose of comparing and evaluating their mechanical behavior. The two chosen industrial mortars were the Weber.Therm Aislone, from Weber Saint-Gobain, and Isodur, from Secil Martingança, their known characteristics are displayed in the Table 2.1.

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Long term mechanical strength behaviour in fly ash/Portland cement ...

For old mortars containing a high volume of ground fly ashes (60% replacement) residual lime due to hydration of Portland cement has not been detected, suggesting that the optimum replacement in order to produce the maximum quantity of pozzolanic reaction products would be lower than 60%. © 2002 Society of Chemical Industry Citing Literature

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Influence of Nano-SiO2 Addition on Microstructure and Mechanical ...

This study investigates the mechanical properties (compressive and flexural strengths) and microstructural properties (as determined by scanning electron microscopy) of the interfacial transition zone between cement pastes and aggregates of mortars applicable for the casting of thin ferrocement elements combining with nanosilica.

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Effect of Morphology and Dispersibility of Silica ... - SpringerOpen

For the Portland cement paste, it is assumed that 1 ml of hydrated cement occupies 2.06 mL of space, the ... Bhattachharyya, S.K. et al. Effect of Morphology and Dispersibility of Silica Nanoparticles on the Mechanical Behaviour of Cement Mortar. International Journal of Concrete Structures and Materials 9, 207-217 (2015 ). https://doi ...

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(PDF) The Effects of Magnesium Borate Whiskers on the Mechanical ...

1 day agoThe Effects of Magnesium Borate Whiskers on the Mechanical Performance of Oil Well Cement September 2022 Advances in Materials Science and Engineering 2022(2):1-10

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Effects of slag-based cementitious material on the mechanical behavior ...

The type and quantity of the binder considerably influence the mechanical behavior and cost of CPB. Typically, ordinary Portland cement (OPC) is the most widely used cementitious material in CPB as it augments desirable mechanical behaviors. OPC, when used as the sole binder, is responsible for more than 70% of the total cost of CPB.

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Thermal and Mechanical Behavior of Composite Mortars Containing Natural ...

With concrete and mortar being the most prevailing construction materials, the manufacturing of cement still represents a huge pollution risk. Production rate of Portland cement is set at approximately 3000 Mt/year [1, 2].

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Effect of graphene on mechanical properties of cement mortars - DeepDyve

Functionalized graphene nano-sheets (FGN) of 0.01%−0.05% (mass fraction) were added to produce FGN-cement composites in the form of mortars. Flow properties, mechanical properties and microstructure of the cementitious material were then investigated. The results indicate that the addition of FGN decreases the fluidity slightly and improves mechanical properties of cement-based composites ...

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Influence of cellulose nanocrystals on the rheological behaviour of ...

on Brazilian Portland cement and pure limestone pastes and mortars. Dry CNC was characterized by SEM and dispersion in water was monitored using optical microscopy. Mini-slump and rotational rheometry were employed to evaluate the effects of CNC in water and in suspensions. Flow table was used to assess flow behaviour

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Nondestructive evaluation of the mechanical behavior of cement-based ...

The present paper describes the acoustic emission (AE) behavior and the mechanical properties of Portlant cement-based mortars due to the addition of multi wall carbon nanotubes (MWCNTs). This research aims in investigating the crack growth behavior of modified cement mortar with MWCNTs that act as nanoreinforcement during an unaxial compression test using acoustic emission technique. MWCNTs ...

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Investigation of physical and mechanical properties of mortars produced ...

Jan 20, 2022To examine the high-temperature behavior of the produced mortar samples, they were exposed to temperatures of 200 °C, 400 °C, 600 °C and 800 °C in a high-temperature oven. By determining the bending and compressive strengths after heating, the strength losses between pre-heating and post-heating were determined.

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SciELO - Brasil - Avaliação das propriedades mecânicas na fratura de ...

Cement-based composite materials, including cement paste, mortar and concrete, are the most commonly used materials in civil construction. However, its brittle nature, high hardness, low tensile strength and propensity to cracking are key factors that compromise durability and result in high maintenance costs for structures.

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The mechanical properties of Portland cement mortars blended with ...

Portland cement mortars were used to study the effect of the nanoparticles on the compressive and flexural strength of the cementing matrices. We found that only NS had a significant effect on the C-S-H formation for up to 21 days of hydration, and that MWCNT did not present a positive effect on the mechanical strength of mortars due to the ...

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Experimental Investigation on Nanosilica and The Behaviour of Ordinary ...

paper aim is to study the mechanical properties of the specimen using the nano silica by replacement of the cement. The ratio in weight of the nano cement with respect to normal cement. The mortar specimen size is 70.6x70.6x70.6 mm. The concrete cube size is 150 x 150 x 150 mm was maintained and water cement ratio 0.40 was maintained throughout the

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Mechanical behaviour of various mortars made by ... - ScienceDirect

From the examination of mechanical behaviour of the mortars (Table 6), we can see that, in the first 28 days, the mortars prepared with the cement obtained by the replacement of clinker by limestone (cement CL and CL 1) decrease the mechanical strengths than the replacement of clinker by fly ash (cement KF 10, KF 20 and KF 30) in the same period.

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Mechanical behaviour of Portland cement mortars with incorporation of ...

Mechanical behaviour of Portland cement mortars with incorporation of Al-containing salt slags - ScienceDirect Cement and Concrete Research Volume 30, Issue 7, July 2000, Pages 1131-1138 Paper Mechanical behaviour of Portland cement mortars with incorporation of Al-containing salt slags

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Soundness in Mortars of Portland Cement with Substitutions Using Cactus ...

The use of dehydrated fibres of cactus, Opuntia ficus-indica (FN), and starch ( starch,Zea Mays (MZ)) as partial substitutes for the total mass of Portland Cement (CP) in the making ofmortar, aims at modifying its physical and mechanical properties, reducing the amount of cementand the CO2 emission. Four mixtures of CP mortar were designed incorporating a superplasticizeradditive with a ...

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Mechanical properties and microstructure of Portland cement concrete ...

The feasibility of using coral reef sand (CRS) in Portland cement concrete is investigated by testing the mechanical property and microstructure of concrete. The composition, structure and properties of the CRS are analyzed. Mechanical properties and microstructure of concrete with CRS are studied and compared to concrete with natural river sand. The relationship between the microstructure and ...

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