Properties of Cement Composites Containing Coir Pith

2014 ◽  
Vol 982 ◽  
pp. 136-140 ◽  
Author(s):  
Eva Vejmelková ◽  
Dana Koňáková ◽  
Anna Krojidlová ◽  
Veronika Hovorková ◽  
Monika Čáchová ◽  
...  
Keyword(s):  
Moisture Transport ◽  
Building Materials ◽  
Agricultural Waste ◽  
Cement Matrix ◽  
Cement Composites ◽  
Coir Fiber ◽  
Transport Parameters ◽  
Coir Pith ◽  
Adhesion Ability ◽  
Mechanical Strengths

Application of agricultural waste materials as building materials not just provides solutions of environmental problems related to the waste management, but it also decreases the use of limited available natural resources and energy. The research in this work is focused on using coconut waste, in the form of natural and chemically treated coir pith, as admixture partially replacing cement in cement composites. The coir pith is the residue acquired during the extraction coir fiber from the outer protective husk of the coconut. Basic physical properties, mechanical, thermal and hygric parameters of several mixtures were studied. The results of measurements showed the influence of amount of coconut addition primarily on parameters such as the bulk density, open porosity, mechanical strengths, moisture transport parameters and thermal parameters. Restrictions for utilization of this waste material relate primarily with its low adhesion ability to the cement matrix.

Influence of Moisture Content on the Thermal Properties of Concrete Containing Agricultural Waste Materials

2016 ◽  
Vol 677 ◽  
pp. 241-245
Author(s):  
Dana Koňáková ◽  
Monika Čáchová ◽  
Eva Vejmelková
Keyword(s):  
Thermal Properties ◽  
Moisture Content ◽  
Physical Properties ◽  
Agricultural Waste ◽  
Thermal Characteristics ◽  
Waste Materials ◽  
Experimental Measurements ◽  
Transport Parameters ◽  
Cement Replacement ◽  
Coir Pith

This article deals with concrete containing waste material originating in a coir fibres extraction from outer protective peel of a coconut. Coir pith is used as cement replacement in amount of 5% and 10%. The influence of moisture content on the thermal properties of studied concrete is determined by means of experimental measurements of basic physical properties, hygric transport parameters and thermal characteristics. From achieved results it can be concluded, that the higher amount of coir pith is used, the better values of thermal characteristics material show. But at the same time thermal characteristics are more influenced by moisture content.

Study of Cement Composites Properties with Filler Based on Wood Pulp

2014 ◽  
Vol 897 ◽  
pp. 165-170 ◽  
Author(s):  
Lucia Kidalova ◽  
Nadežda Števulová ◽  
Anton Geffert
Keyword(s):  
Mechanical Properties ◽  
Building Materials ◽  
Raw Materials ◽  
Volume Ratio ◽  
Physical And Mechanical Properties ◽  
Wood Pulp ◽  
Cement Matrix ◽  
Cement Composites ◽  
Renewable Materials ◽  
Cellulosic Fibres

Sustainable building materials are based on the use of renewable materials instead of non-renewable. A large group of renewable raw materials are materials of plant origin containing cellulosic fibres which are used as filler into building material with reinforcement function of composite. This study aimed to establish the mechanical and physical properties of cement composites with organic filler, such as wood pulp. Pulp derived from wood pulping process is very interesting material as reinforcement in cement which contributes to a reduction of pollutants. In this paper, utilization of unbleached and bleached wood pulp in combination with cement matrix with emphasis on the physical and mechanical properties is studied. Varying the producing technology (wood pulp and cement ratio in mixture) it is possible to obtain composites with density from 940 to 1260 kg.m-3 and with compressive strength from 1.02 to 5.44 MPa after 28 days of hardening. The experimental results of mechanical properties indicate that cement composites with using unbleached wood pulp reaches higher values than composites based on bleached wood pulp. The percentage of water uptake increased with increasing the volume ratio of unbleached wood pulp in composite.

scholarly journals Innovative Husk-Crete Building Materials from Rice Chaff and Modified Cement Mortars

2020 ◽  
Vol 23 (2) ◽  
pp. 67-72
Author(s):  
Banjo Akinyemi ◽  
Temidayo E. Omoniyi ◽  
Olugbenga Elemile ◽  
Oluwafemi Arowofila
Keyword(s):  
Building Material ◽  
Building Materials ◽  
Agricultural Waste ◽  
Styrene Butadiene Rubber ◽  
Cement Matrix ◽  
Butadiene Rubber ◽  
Matrix System ◽  
Split Tensile Strength ◽  
Cement Mortars ◽  
Styrene Butadiene

AbstractThe study considers the use of rice chaffs (husks) as an aggregate in a composite cement matrix system. Cement mortars were modified using styrene butadiene rubber polymer for strengthening. The goal is to develop a lightweight building material with good thermal insulation properties out of agricultural waste. The compressive strength, split tensile strength and flexural strength were experimentally evaluated. Further analyses of the samples were carried out by means of scanning electron microscope and energy dispersive spectroscopy. The key results obtained were presented and analysed with the performance of the proposed husk-crete building material showing adequate properties essential for a lightweight structural material with possible applications for non-structural purposes.

Utilizing Agricultural Waste as an Environmentally Friendly Cement Composite

2019 ◽  
Vol 891 ◽  
pp. 132-136
Author(s):  
Varinthorn Boonyaroj ◽  
Sirichai Saramanus
Keyword(s):  
Fiber Volume Fraction ◽  
Volume Fraction ◽  
Agricultural Waste ◽  
Cement Composite ◽  
Cement Composites ◽  
Coir Fiber ◽  
Fiber Volume ◽  
Coconut Coir ◽  
White Portland Cement ◽  
Potential Use

Utilizing coconut coir fiber can offer an alternative method of adding value to agricultural wastes and help to conserve the environment with green products. The aim of this research was to investigate the potential use of coconut coir fiber as an eco-friendly material for cement composites. The properties of these cement composites mixed with varying proportions of paper waste were compared to ordinary white Portland cement. In addition, the surface structure and chemical characteristics of the samples were examined with a scanning electron microscope (SEM) and an energy-dispersive x-ray spectrometer (EDS). The results showed that the cement composites consisted mainly of the elements carbon (C), oxygen (O), and calcium (Ca) in the range of 34-44%, 42-49%, and 11-19% by weight, respectively. The density of OPC, 0%, 50%, 100% of coconut coir fiber cement composite at 28 days curing time were found 1.85±0.03 g/cm3,1.72±0.02 g/cm3, 1.66±0.05 g/cm3, 1.56±0.02 g/cm3, respectively. Moreover, the compressive and flexural strength of the cement composites decreased with an increase in the coconut coir fiber volume fraction.

scholarly journals Sound-Absorbing and Thermal-Insulating Properties of Cement Composite Based on Recycled Rubber from Waste Tires

2021 ◽  
Vol 11 (6) ◽  
pp. 2725
Author(s):  
Jakub Svoboda ◽  
Tomáš Dvorský ◽  
Vojtěch Václavík ◽  
Jakub Charvát ◽  
Kateřina Máčalová ◽  
...  
Keyword(s):  
Building Materials ◽  
Absorption Capacity ◽  
Acoustic Properties ◽  
Strength Characteristics ◽  
Cement Composites ◽  
Waste Tires ◽  
Natural Aggregate ◽  
Thermal Insulating ◽  
Recycled Rubber ◽  
Insulating Properties

This article describes an experimental study aimed at investigating the potential use of recycled rubber granulate from waste tires of fractions 0/1 and 1/3 mm in cement composites as a 100% replacement for natural aggregates. The use of waste in the development and production of new building materials represents an important aspect for the sustainability and protection of the environment. This article is focused on the sound-absorbing and thermal-insulating properties of experimental cement composites based on recycled rubber from waste tires. The article describes the grain characteristics of recycled rubber, sound absorption capacity, thermal conductivity and strength characteristics. The results of this research show that the total replacement of natural aggregate with recycled rubber in cement composites is possible. Replacing natural aggregate with recycled rubber has significantly improved the thermal and acoustic properties of the prepared cement composites, however, at the same time; there was also the expected decrease in the strength characteristics due to the elasticity of rubber.

scholarly journals The Influence of Cement Substitution by Biomass Fly Ash on the Polymer–Cement Composites Properties

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3079
Author(s):  
Beata Jaworska ◽  
Dominika Stańczak ◽  
Joanna Tarańska ◽  
Jerzy Jaworski
Keyword(s):  
Fly Ash ◽  
Building Materials ◽  
Raw Materials ◽  
Combustion Process ◽  
Biomass Combustion ◽  
Cement Composites ◽  
Cement Mortars ◽  
Mineral Additive ◽  
Biomass Fly Ash

The generation of energy for the needs of the population is currently a problem. In consideration of that, the biomass combustion process has started to be implemented as a new source of energy. The dynamic increase in the use of biomass for energy generation also resulted in the formation of waste in the form of fly ash. This paper presents an efficient way to manage this troublesome material in the polymer–cement composites (PCC), which have investigated to a lesser extent. The research outlined in this article consists of the characterization of biomass fly ash (BFA) as well as PCC containing this waste. The characteristics of PCC with BFA after 3, 7, 14, and 28 days of curing were analyzed. Our main findings are that biomass fly ash is suitable as a mineral additive in polymer–cement composites. The most interesting result is that the addition of biomass fly ash did not affect the rheological properties of the polymer–cement mortars, but it especially influenced its compressive strength. Most importantly, our findings can help prevent this byproduct from being placed in landfills, prevent the mining of new raw materials, and promote the manufacture of durable building materials.

scholarly journals Preparation and Mechanical Properties of Graphene Oxide: Cement Nanocomposites

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Fakhim Babak ◽  
Hassani Abolfazl ◽  
Rashidi Alimorad ◽  
Ghodousi Parviz
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Graphene Oxide ◽  
Cement Mortar ◽  
Cement Matrix ◽  
Cement Composites ◽  
Xrd Diffraction ◽  
Calcium Silicate Hydrates ◽  
The Matrix ◽  
Scanning Electron

We investigate the performance of graphene oxide (GO) in improving mechanical properties of cement composites. A polycarboxylate superplasticizer was used to improve the dispersion of GO flakes in the cement. The mechanical strength of graphene-cement nanocomposites containing 0.1–2 wt% GO and 0.5 wt% superplasticizer was measured and compared with that of cement prepared without GO. We found that the tensile strength of the cement mortar increased with GO content, reaching 1.5%, a 48% increase in tensile strength. Ultra high-resolution field emission scanning electron microscopy (FE-SEM) used to observe the fracture surface of samples containing 1.5 wt% GO indicated that the nano-GO flakes were well dispersed in the matrix, and no aggregates were observed. FE-SEM observation also revealed good bonding between the GO surfaces and the surrounding cement matrix. In addition, XRD diffraction data showed growth of the calcium silicate hydrates (C-S-H) gels in GO cement mortar compared with the normal cement mortar.

Moisture Transport in Wood-Based Structural Panels under Transient Hygroscopic Conditions

2020 ◽  
Vol 70 (3) ◽  
pp. 283-292
Author(s):  
Daniel Way ◽  
Frederick A. Kamke ◽  
Arijit Sinha
Keyword(s):  
Moisture Transport ◽  
Transport Model ◽  
Oriented Strand Board ◽  
Primary Objective ◽  
Accelerated Weathering ◽  
Wood Composite ◽  
Transport Parameters ◽  
Moisture Profile ◽  
Cyclic Changes ◽  
Wood Based Composite

Abstract Development of moisture gradients within wood and wood-based composites can result in irreversible moisture-induced damage. Accelerated weathering (AW), generally employing harsh environmental conditions, is a common tool for assessing moisture durability of wood composite products. Use of milder AW conditions, such as cyclic changes in relative humidity (RH), may be of interest to the wood-based composites industry in assessing moisture durability under more realistic conditions. The primary objective of this study was to determine whether moisture profile development in oriented strand board and plywood during cyclic RH changes could be reasonably predicted with a simple moisture transport model, which may be practical for wood-based composite industry members seeking to develop new AW protocols. The diffusion model based on Fick's second law with empirically determined moisture transport parameters fits the experimental data reasonably well for the purpose of screening RH parameters.

scholarly journals Application of the nanoindentation method in assessing of properties of cement composites modified with silica-magnetite nanostructures

2018 ◽  
Vol 163 ◽  
pp. 02002 ◽  
Author(s):  
Elzbieta Horszczaruk ◽  
Roman Jedrzejewski ◽  
Jolanta Baranowska ◽  
Ewa Mijowska
Keyword(s):  
Mechanical Properties ◽  
Magnetite Nanoparticles ◽  
Positive Influence ◽  
Cement Matrix ◽  
Core Shell ◽  
Indentation Modulus ◽  
Cement Composites ◽  
Interfacial Zone ◽  
Berkovich Indenter ◽  
The Core

The results of investigation of the cement composites modified with 5% of silica-magnetite nanostructures of the core-shell type are presented in the paper. The nanoindentation method employing three-sided pyramidal Berkovich indenter was used in the research. The mechanical properties and microstructure of the modified cement composites were evaluated on the basis of the values of hardness and indentation modulus measured inside the cement matrix and in the aggregate-paste interfacial zone. The results were compared with those obtained for the reference composites without nanostructures. The positive influence of the presence of silica-magnetite nanoparticles on the tested properties was found out.

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