scholarly journals Inhibition of Cracks on the Surface of Cement Mortar Using Estabragh Fibers

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Tahereh Soleimani ◽  
Ali Akbar Merati ◽  
Masoud Latifi ◽  
Ali Akbar Ramezanianpor
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Bending Strength ◽  
Cement Mortar ◽  
Physical And Mechanical Properties ◽  
Cement Composite ◽  
Cement Composites ◽  
Surface Cracks ◽  
Reinforced Cement ◽  
Mortar Matrix

The influence of adding Estabragh fibers into the cement composites of mortar on surface cracks and mechanical properties of mortar has been studied at various fiber proportions of 0.25%, 0.5%, and 0.75%. The mortar shrinkage was evaluated by counting the number of cracks and measuring the width of cracks on the surface of mortar specimens. Although the Estabragh fibers loss their strength in an alkali environment of cement composites, the ability of Estabragh fibers to bridge on the microcracks in the mortar matrix causes a decrease in the number of cracks and in their width on the surface of the mortar samples in comparison with the plain mortar. However, considering the mechanical properties of specimens such as bending strength and compressive strength, among all fiber proportions, only the specimens with 0.25% of Estabragh fiber performed better in all respects compared to the physical and mechanical properties of reinforced cement composite of mortar. Consequently, by adding 0.25% of Estabragh fibers to the cement mortar, a remarkable inhibition in crack generation on fiber-containing cement composite of mortar is achieved.

Reinforced Cement Composites – Effect of Hybrid Fibres on Selected Properties

2015 ◽  
Vol 824 ◽  
pp. 179-183
Author(s):  
Dana Koňáková ◽  
Eva Vejmelková
Keyword(s):  
Mechanical Properties ◽  
Thermal Loading ◽  
Bending Strength ◽  
Linear Thermal Expansion Coefficient ◽  
Linear Thermal Expansion ◽  
Cement Composite ◽  
Polypropylene Fibre ◽  
Cement Composites ◽  
Matrix Density ◽  
Reinforced Cement

In this article selected properties of a glass and polypropylene fibre reinforced cement composite materials are studied. They are determined either after preceding thermal treatment or during thermal loading. Basic physical properties (in concrete terms bulk density, matrix density and open porosity), mechanical properties (in concrete terms tensile strength and bending strength) are determined after subjecting the specimens to the pre-heating temperatures of 600°C, 800°C and 1000°C. The linear thermal expansion coefficient is measured directly as functions of temperature up to 1000°C. The critical temperature for the glass and polypropylene fibre reinforced cement composite when most properties are worsening in a significant way is found apparently 500°C.

Cellulose Fibres as a Reinforcing Element in Building Materials

2017 ◽  
Author(s):  
Viola Hospodarova ◽  
Nadezda Stevulova ◽  
Vojtech Vaclavik ◽  
Tomas Dvorsky ◽  
Jaroslav Briancin
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Compressive Strength ◽  
Building Materials ◽  
Reference Sample ◽  
Physical And Mechanical Properties ◽  
Natural Fibre ◽  
Cement Composites ◽  
Cellulose Fibres ◽  
Cellulosic Fibres

Nowadays, construction sector is focusing in developing sustainable, green and eco-friendly building materials. Natural fibre is growingly being used in composite materials. This paper provides utilization of cellulose fibres as reinforcing agent into cement composites/plasters. Provided cellulosic fibres coming from various sources as bleached wood pulp and recycled waste paper fibres. Differences between cellulosic fibres are given by their physical characterization, chemical composition and SEM micrographs. Physical and mechanical properties of fibre-cement composites with fibre contents 0.2; 0.3and 0.5% by weight of filler and binder were investigated. Reference sample without fibres was also produced. The aim of this work is to investigate the effects of cellulose fibres on the final properties (density, water absorbability, coefficient of thermal conductivity and compressive strength) of the fibrecement plasters after 28 days of hardening. Testing of plasters with varying amount of cellulose fibres (0.2, 0.3 and 0.5 wt. %) has shown that the resulting physical and mechanical properties depend on the amount, the nature and structure of the used fibres. Linear dependences of compressive strength and thermal conductivity on density for plasters with cellulosic fibres adding were observed.

scholarly journals Zastosowanie popiołu lotnego i szkła kineskopowego w zaprawach cementowych

2018 ◽  
Vol 27 (3) ◽  
pp. 348-354 ◽  
Author(s):  
Jakub Jura ◽  
Małgorzata Ulewicz
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Cement Mortar ◽  
Physical And Mechanical Properties ◽  
Waste Materials ◽  
Glass Cullet ◽  
Glass Waste ◽  
Cement Mortars ◽  
Resistance Tests ◽  
Made In

The article presents the results of research aimed at using glass waste and ash from biomass. The tests were carried out for cement mortars samples with using glass cullet, ash from biomass and using both wastes in 50/50 proportions. The physical and mechanical properties of the standard mortar and modified mortars were tested. Standard mortar and cement mortar samples were made in which 10, 20 and 30% of the cement mass was used as part of the standard sand. The samples were made of CEM I 42.5R. Mortars containing fly ash addition had an increased compressive strength and a smaller drop in compressive strength after frost resistance tests than standard mortar. The use of glass cullet in the amount of up to 20% did not reveal any changes in the mechanical properties of mortars, but using them in a larger amount resulted in unfavorable results. The use of a mixture of these two waste materials did not improve the results. The research has shown the possibility of using this waste to modify cement mortars.

Influence of Silica Based Carbon Nano Tube Composites in Concrete

2017 ◽  
Vol 26 (1) ◽  
pp. 096369351702600
Author(s):  
BLP Dheeraj Swamy ◽  
Vaibhav Raghavan ◽  
K Srinivas ◽  
K Narasinga Rao ◽  
Mahadevan Lakshmanan ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Mechanical Performance ◽  
Cement Mortar ◽  
Cement Composite ◽  
Small Scale ◽  
Cement Composites ◽  
Potential Candidate ◽  
Carbon Nano Tube ◽  
Portland Cement Paste

This study focuses on the utilization of highly densified materials in cementitious composites with objectives of improving the mechanical performance and minimizing the number and size of defects. Due to their excellent mechanical properties, carbon nanotubes (CNTs) are now viewed as potential candidate for reinforcement in cement composites. The present paper reports the use of carbon nanotubes (CNTs) as reinforcement to improve the mechanical properties of portland cement paste and creating multifunctional concrete. In order to increase the bonding, and strength, a material with intermediate fineness, highly densified silica fumes, was also utilized. The densified silica fumes along with CNT are added to cement mortar in various proportions. Small-scale specimens were prepared to measure the mechanical properties as a function of nanotube concentration and distribution. Furthermore, properties like shrinkage, permeability and alkalinity of the resultant composite were also investigated. The study addresses the significance of CNT as an additive to the enhancement of properties of cement composite.

Cement Building Materials with Powdered Optical Discs as a Filler

2021 ◽  
Vol 887 ◽  
pp. 415-421
Author(s):  
V. Ezerskiy ◽  
N.V. Kuznetsova ◽  
A.D. Seleznev
Keyword(s):  
Compressive Strength ◽  
Composite Material ◽  
Building Materials ◽  
Bending Strength ◽  
Physical And Mechanical Properties ◽  
Cement Composite ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Optical Discs ◽  
Filler Mass

The object of study is a cement composite material with powdered utilized optical discs. The objective is to establish the dependences of the main strength characteristics – com-pressive strength, bending strength, and density – on the amount of waste added into the mix-ture and the water-cement ratio.The compositions of the mixtures for the production of the cement composite material samples consisted of the following components: cement, sand, powdered waste in the form of utilized optical discs and water.Based on the results of testing the samples, mathematical models have been developed which describe the dependences of the physical and mechanical properties of the cement com-posite material samples on the fraction of waste and water-cement ratio. It was found that with an increase in the amount of powdered waste added into the mixture, it reduces the compressive strength, bending strength, and density of the samples under study, however, the optimization of the water-cement ratio makes it possible to obtain equal strength compositions with a differ-ent fraction of waste.Component compositions of cement composite material mixtures with the addition of powdered utilized optical discs in the amount of 10 to 25 % of the total filler mass, which can provide construction products with a compressive strength class B20, are presented.

scholarly journals Performance of Carbon Fiber Filament Reinforcing Cement Mortar

2021 ◽  
Vol 7 (10) ◽  
pp. 1693-1701
Author(s):  
Ahmed Hamed El-Sayed Salama ◽  
Walid Fouad Edris
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Carbon Fiber ◽  
Flexural Strength ◽  
Cement Mortar ◽  
Physical And Mechanical Properties ◽  
Experimental Program ◽  
Flow Table ◽  
Compressive And Flexural Strengths ◽  
Measured Density

This paper aims to study the effect of Carbon Fiber Filament (CFF) with different ratios and lengths on the physical and mechanical properties of cement mortar. An experimental program included 3 cm fixed length of CFF with 0, 0.25, 0.5, 0.75, and 1% different ratios by weight of cement addition were used in cement mortar cubes. Another experimental program of 0.5% CFF ratio with 1, 2, 3, 4, and 5 cm different lengths by weight of cement addition was used in cement mortar prisms. The physical and mechanical properties of cement mortar containing CFF were experimentally investigated at 7 and 28 days of curing. Workability, by means of flow table test, were measured. Density is conducted for cubes and prisms at the age of 28 days. At ages of 7 and 28 days, compressive and flexural strengths were studied. The study showed a reduction in workability with the increase of CFF ratios and lengths by 0.0 to 2.7% and by 0.9 to 5.4% respectively. Moreover, an improvement in density, compressive, and flexural strengths was observed. At ages of 7 and 28 days, the results showed that compressive strength increased by 33 and 31% respectively at 0.5% of CFF ratio while the flexural strength increased by 125 and 327% respectively with CFF length of 5 cm. Doi: 10.28991/cej-2021-03091753 Full Text: PDF

scholarly journals Effects of Silica Nanoparticle Addition on Physical and Mechanical properties of Sugar Palm Fibers Reinforced Cement Composite Concrete

2020 ◽  
Vol 1 (1) ◽  
pp. 24
Author(s):  
Bintoro Siswo Nugroho ◽  
Yoga Pebrianto ◽  
Irfana Diah Faryuni ◽  
Asifa Asri
Keyword(s):  
Mechanical Properties ◽  
Physical And Mechanical Properties ◽  
Silica Nanoparticle ◽  
Cement Composite ◽  
Nano Silica ◽  
Water Testing ◽  
The Matrix ◽  
Reinforced Cement ◽  
Positive Effect

This study examines the effect of nanosilica addition to the physical and mechanical properties of sugar palm fibers (SPFs) reinforced cement composite concrete. The composite concrete ingredients are SPFs as the filler, cement and nano-silica as the matrix, CaCl2 as the catalyst, and water. Testing and fabrication of the composite concrete were performed according to the standard of ASTM C 1185 and ASTM C 1186. The results obtained show that, in general, the addition of nanosilica improves the quality of the composite concrete. A positive effect is attained by adding nanosilica to its optimum amount. The excessive addition of nanosilica reduces the quality of the composite. The composite's mechanical property that is negatively affected by the addition of the nanosilica is the elasticity, in which more nanosilica added stiffer the composite.

scholarly journals PHYSICAL AND MECHANICAL PROPERTIES OF CEMENT MORTAR USING LIME AND BAMBOO-ASH AS PARTIAL REPLACEMENTS

2018 ◽  
Vol 30 (2) ◽  
Author(s):  
Nkumah Lucky David ◽  
Lasisi Kayode Hassan
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Absorption Rate ◽  
Cement Mortar ◽  
Significant Proportion ◽  
Physical And Mechanical Properties ◽  
Partial Replacement ◽  
Increase With Increase ◽  
Mix Proportion ◽  
Masonry Mortar

The effect of varying different proportion of bamboo ash and lime as partial replacement for cement in mortar were studied. Bamboo stalks were collected and burned into bamboo ash in furnace. The results of the physical and mechanical properties of the cement and aggregate used were within the requirements stipulated by relevant standards. The mix proportion 1:6 was used out of which 2%, 4% of bamboo ash and 2%, 4% of lime were used to partially replace cement in the mortar. The compressive strength of most of the mortar cubes increases with curing days and their values lie within the required strength of 2.5 N/mm2 – 6.5 N/mm2 as stipulated by relevant codes. The water absorption rate was observed to increase with increase in bamboo ash and lime content, while the density decreases as the percentage of bamboo ash and lime in the mortar increases by mass. The study therefore can be concluded that in the presence of significant proportion (i.e. 4% or more) of bamboo ash the strength of mortar increased hence making it adequate for the production of masonry mortar and reduces building failure.

scholarly journals Modeling of properties of fiber reinforced cement composites

2008 ◽  
Vol 6 (2) ◽  
pp. 165-172
Author(s):  
Dragica Jevtic ◽  
Dimitrije Zakic ◽  
Aleksandar Savic
Keyword(s):  
Fiber Reinforcement ◽  
Physical And Mechanical Properties ◽  
Cement Composite ◽  
Cement Composites ◽  
Fiber Reinforced ◽  
Deformation Properties ◽  
Concrete Type ◽  
Reinforced Cement ◽  
Mechanical Strengths ◽  
Modeling Of Properties

This paper presents the results of authors' laboratory testing of the influence of steel fibers as fiber reinforcement on the change of properties of cement composite mortar and concrete type materials. Mixtures adopted - compositions of mortars had identical amounts of components: cement, sand and silica fume. The second type of mortar contained 60 kg/m3 of fiber reinforcement, as well as the addition of the latest generation of superplasticizer. Physical and mechanical properties of fiber reinforced mortars and etalon mixtures (density, flexural strength, compressive strength) were compared. Tests on concrete type cement composites included: density, mechanical strengths and the deformation properties. The tests showed an improvement in the properties of fiber reinforced composites.

scholarly journals Improvement of Flexural and Compressive Strength of Cement Mortar by Graphene Nanoplatelets

2021 ◽  
Vol 15 (1) ◽  
pp. 165-171
Author(s):  
Yu Chen ◽  
Xingchen Li ◽  
Chuangchuang Li ◽  
Nana Zhang ◽  
Ronggui Liu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Cement Hydration ◽  
Cement Mortar ◽  
Structural Strength ◽  
Graphene Nanoplatelets ◽  
Research Trend ◽  
Cement Matrix ◽  
Cement Composites ◽  
Engineering Structures

Background: In order to provide space for improving the durability of engineering structures by enhancing strength, the addition of nanomaterials has become a research trend in recent years. Graphene and its derivatives have unique properties and have been used in certain fields, which has also stimulated continuous and in-depth research on whether it can improve structural strength. Objective: This paper investigates the mechanical properties and mechanism of cement-based materials reinforced by Graphene Nanoplatelets (GNPs). Methods: Macroscopically, the flexural strength and compressive strengths of cement mortar were tested. Microscopically, the structure and composition were characterized and analyzed by SEM, EDS, and XRD. Results: The results show that the mechanical properties of modified cement mortar are directly related to the GNPs content. When the GNPs content is 0.04wt%, the flexural and compressive strength can still be increased by 12.8% and 33.9% after 28 d. Furthermore, the appropriate content of GNPs dispersed in the cement matrix played a role in promoting cement hydration. The interconnection with hydration products further reduces cracks and pores so that the cement composites form a denser microstructure. Conclusion: The results obtained above would provide references for understanding the reinforcement mechanism of GNPs.

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