Strength properties and potential uses of rattan–cement composites

2005 ◽  
Vol 4 (4) ◽  
pp. 343-352 ◽  
Author(s):  
Olorunnisola ◽  
Pitman ◽  
Mansfield-William
Keyword(s):  
Strength Properties ◽  
Cement Composites

The study of strength of wood-cement composites based on waste wood

2015 ◽  
Vol 5 (3) ◽  
pp. 191-199
Author(s):  
Филичкина ◽  
Maria FilichkinaM ◽  
Копарев ◽  
Vladimir Koparev
Keyword(s):  
Cement Composite ◽  
Strength Properties ◽  
Material Strength ◽  
Cement Composites ◽  
Compression Method ◽  
Waste Wood ◽  
Good Range ◽  
Wood Cement Composites ◽  
Construction Product

The article presents the results of studies on the production of wood-cement composite with various fillers, such as sawdust, gravel, bark and shavings, the binder acts as a cement. The developed technology allows producing the construction product with a good range of strength properties depending on the product. In the work carried out tests of samples on the strength of a compression method on the equipment VSFEU. The result of testing the strength of steel obtained dependence of material strength on the fraction of components in the mixture components, which then led to the conclusion that the strength limits varied from 0.38 MPa to 2.72 MPa.

scholarly journals Development of Waste-Based Alkali-Activated Cement Composites

Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5815
Author(s):  
Adrienn Boros ◽  
Csilla Varga ◽  
Roland Prajda ◽  
Miklós Jakab ◽  
Tamás Korim
Keyword(s):  
Compressive Loading ◽  
Storage Conditions ◽  
Strength Properties ◽  
Specimen Size ◽  
Cement Composites ◽  
Experimental Parameters ◽  
The Matrix ◽  
Kaolin Wool ◽  
Furnace Slag ◽  
Alkali Activated

Nowadays, global warming and the ensuing climate change are one of the biggest problems for humanity, but environmental pollution and the low ratio of waste management and recycling are not negligible issues, either. By producing alkali-activated cements (AACs), it is possible to find an alternative way to handle the above-mentioned environmental problems. First, with a view to optimizing experimental parameters, metakaolin-based AACs were prepared, and in it, waste tire rubber was used as sand replacement (5–45 wt %). Insufficient wetting between the rubber particles and the matrix was corrected through different surface treatments of the rubber. For improving the mechanical/strength properties of the specimens, fibrous waste kaolin wool (0.5–1.5 wt %) was added to the AAC matrix. Considering the results of model experiments with metakaolin, blast-furnace-slag-based AAC composites were developed. The effects of storage conditions, specimen size and cyclic loading on the compressive strength were investigated, and the resulting figures were compared with the relevant values of classic binders. The strength (44.0 MPa) of the waste-based AAC composite significantly exceeds the required value (32.5 MPa) of clinker saving slag cement. Furthermore, following cyclic compressive loading, the residual strength of the waste-based AAC composite shows a slight increase rather than a decrease.

scholarly journals Composite grouting mortar based on 3D-NKM - nanocrystalline inoculant

2018 ◽  
Vol 196 ◽  
pp. 04061 ◽  
Author(s):  
Marina Panfilova ◽  
Nikolay Zubrev ◽  
Olga Novoselova ◽  
Sania Efremova
Keyword(s):  
Frost Resistance ◽  
Raw Materials ◽  
Physical And Mechanical Properties ◽  
Strength Properties ◽  
Nanocrystalline Powder ◽  
Cement Composites ◽  
Reliable Operation ◽  
Nano Additives ◽  
Composite Solution

For the waterproofing of tunnels and the uniform distribution of space between the lining of tunnels and rock, composite injection solutions are used. To improve the physical and mechanical properties of cement composites, the nanoconstruction effect is used, which is possible when using nanoparticles with extended geometry. Nano-additives and nanomodifiers consisting of nanoparticles, both natural and artificial and technogenic, can be used for the production of cement-containing solutions and concretes. For example, under certain conditions nanocrystalline powder of oxides and hydroxides of aluminum to nanotechnogenic raw materials can be referred to wastes of technogenic origin. The paper investigated the effect of nano-additives-boehmite, which is a waste of production, to increase the strength and frost resistance of plugging materials made on the basis of cement when administered. It is established that the use of boehmite as an additive in cements leads to an increase in the strength properties of concrete and increase its frost resistance, which is a prerequisite for long-term and reliable operation of the composite solution. Thus, the composite solution modified by boehmite is the basis for the creation of plugging solutions

scholarly journals Lignin-Based Hybrid Admixtures and their Role in Cement Composite Fabrication

Molecules ◽  
2019 ◽  
Vol 24 (19) ◽  
pp. 3544 ◽  
Author(s):  
Łukasz Klapiszewski ◽  
Izabela Klapiszewska ◽  
Agnieszka Ślosarczyk ◽  
Teofil Jesionowski
Keyword(s):  
Hybrid Materials ◽  
Cement Mortar ◽  
Cement Composite ◽  
Strength Properties ◽  
Cement Composites ◽  
Mechanical Method ◽  
Efficient Manner ◽  
Sustainable Building ◽  
Organic Hybrid ◽  
Composite Fabrication

In this study, a technology for obtaining functional inorganic-organic hybrid materials was designed using waste polymers of natural origin, i.e., kraft lignin and magnesium lignosulfonate, and alumina as an inorganic component. Al2O3-lignin and Al2O3-lignosulfonate systems were prepared by a mechanical method using a mortar grinder and a planetary ball mill, which made it possible to obtain products of adequate homogeneity in an efficient manner. This was confirmed by the use of Fourier transform infrared spectroscopy and thermogravimetric analysis. In the next step, the developed hybrid materials were used as functional admixtures in cement mixtures, thus contributing to the formation of a modern, sustainable building material. How the original components and hybrid materials affected the mechanical properties of the resulting mortars was investigated. The admixture of biopolymers, especially lignin, led to cement composites characterized by greater plasticity, while alumina improved their strength properties. It was confirmed that the system containing 0.5 wt.% of alumina-lignin material is the most suitable for application as a cement mortar admixture.

scholarly journals Utilization of wastes from medium density fiberboards production as an aggregate for lightweight cement composite

2018 ◽  
Vol 174 ◽  
pp. 02005 ◽  
Author(s):  
Dorota Małaszkiewicz ◽  
Magdalena Sztukowska
Keyword(s):  
Compressive Strength ◽  
Lightweight Concrete ◽  
Medium Density Fiberboard ◽  
Cement Composite ◽  
Strength Properties ◽  
Cement Composites ◽  
Medium Density ◽  
Wood Fibers ◽  
Resin Binder ◽  
Wood Cement Composites

The possibility of recycling waste from medium density fiberboard (MDF) production into wood-cement composites was evaluated. A large quantity of lignocellulosic wastes is generated worldwide from various sources, including wood and furniture industries, leading to environmental concerns. Medium density fiberboard (MDF) is an engineered wood product, which is made from wood fibers (mainly form coniferous trees) with wax and a resin binder. This paper presents an experimental study which investigated the potential utilization of medium density fiberboard wastes (MDFW) for producing lightweight insulation concrete. The wastes were screened on #8 mm sieve to exlude big irregular elements which could negatively affect compaction and strength properties. All lignocellulosic substrates have detrimental effects on cement setting so different techniques were applied to offset the retarding effect of compounds like sugar and tannin present in the bio-based particles before mixing the wastes with cement. One type of cement CEM I 42,5 R was used in the experiment. Flexural strength, compressive strength in air-dry and wet states, and water absorption of lightweight concrete were tested. Compressive strength ranging from 0,5 to 5.3 MPa was obtained depending on the material used for the initial impregnation of MDFW fibers.

Influence of Co-Polymer Dispersion Additives onto Shrinkage Strains for Cementitous Mortars and Concretes

2011 ◽  
Vol 287-290 ◽  
pp. 1097-1101 ◽  
Author(s):  
Maciej Gruszczyński
Keyword(s):  
Bending Strength ◽  
Concrete Structures ◽  
Strength Properties ◽  
Cement Composites ◽  
Polymer Dispersion ◽  
Mass Reduction ◽  
Different Types

In the paper there is presented the influence of different types of co-polymer dispersion additives onto the magnitude of shrinkage and strength properties of cement composites. The effect of application of such additives was compared and confronted with the action of widely used classical admixture reducing shrinkage based on multi-molecular alcohol (propylene alcohol). As a result of conducted tests the significant reduction in shrinkage strains and increase in bending strength was observed due to the application of co-polymer dispersion with the amount of at least 5% of the cement mass. Reduction of shrinkage and improvement of serviceability properties to great extent prejudge the technical attractiveness of co-polymer and cement materials for the cases of concrete structures repairs and constructing industrial floors without joints.

Gypsum-Cement Composites Based on Volcanic Ash

2020 ◽  
Vol 1011 ◽  
pp. 136-143
Author(s):  
Tolya Khezhev ◽  
Tamerlan Badziev ◽  
Talib Soblirov ◽  
Timur Tamashev
Keyword(s):  
Portland Cement ◽  
Volcanic Ash ◽  
Water Resistance ◽  
Central Area ◽  
Cement Composite ◽  
Strength Properties ◽  
Cement Composites ◽  
Basalt Fibers ◽  
Initial Matrix ◽  
Optimization Parameters

The studies’ results to determine the gypsum, ash and Portland cement components proportions, which would ensure a decrease in the specific binder consumption, as well as the ash grain composition’s effect on the properties of the gypsum cement pozzolan composite, are presented. It was revealed that the use of volcanic ash together with Portland cement in gypsum concrete composites allows reducing gypsum consumption by up to 50% without a significant decrease in strength characteristics. At the same time, the developed gypsum concrete composites have increased water resistance. The influence of the ash particle size distribution on the strength properties of the composite is ambiguous; in the compositions with a high ash content it is advisable to use larger fractions, and with a content of less than 50% ash in the composite, - the small fractions. To study the parameters’ effect of the dispersed reinforcement with basalt fibers on the properties of a gypsum-cement composite, an experiment with such a second-order composite rotatable plan as regular hexagon was conducted. It was found that the maximum values ​​of optimization parameters are observed in the central area of ​​the plan with and . The compressive strength of a fiber gypsum cement pozzolan composite increases by 1.15-1.18 times, when bending, by 1.56-1.72 times with respect to the strength of the initial matrix.

Flexural and Compressive Strength of the Cement Paste with Recycled Concrete Powder

2017 ◽  
Vol 1144 ◽  
pp. 65-69
Author(s):  
Jaroslav Topič ◽  
Josef Fládr ◽  
Zdeněk Prošek
Keyword(s):  
Compressive Strength ◽  
Cement Paste ◽  
Cost Reduction ◽  
Negative Impact ◽  
Reference Sample ◽  
Strength Properties ◽  
Recycled Concrete ◽  
Cement Composites ◽  
Cement Production ◽  
Cement Replacement

In previous work focused on using recycled concrete powder as cement replacement the basic dependency of the mechanical properties on the amount of recycled concrete powder was defined. Influence of the amount of recycled concrete powder on the flexural and compressive strength was shown on 0, 33, 67 and 100 wt. % cement replacement. Based on the previous data the strength properties of the cement paste with recycled concrete powder below 33 wt. % was almost constant and strength properties were comparable with reference sample made of cement only. After the recycled concrete powder in cement paste exceeded amount of 33 wt. % the flexural and compressive strength decrease rapidly. In case of 67 wt. % amount of recycled concrete powder the compressive strength decrease about 65 %. The aim of this article is define critical amount of recycled concrete powder in cement paste when strength properties start decrease rapidly and cement replacement is no longer beneficial. This critical amount will be located somewhere between 30 and 50 wt. % of recycled concrete powder. Replacement below critical amount could lead to cost reduction of cement composites and also the negative impact of the cement production and concrete disposal on environmental could be reduced.

scholarly journals EFFECT OF WOLLASTONITE ON THE MECHANICAL CHARACTERISTICS OF CONCRETE

2020 ◽  
Vol 3 (5) ◽  
pp. 34-42
Author(s):  
A. Kozin ◽  
R. Fedyuk ◽  
Yu. Il'inskiy ◽  
S. Yarusova ◽  
P. Gordienko ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Physical And Mechanical Properties ◽  
High Strength ◽  
Strength Properties ◽  
Cement Clinker ◽  
Cement Matrix ◽  
Dual Function ◽  
Cement Stone ◽  
Cement Composites ◽  
Reinforcing Fiber

Improvement of the physical and mechanical properties of cement composites should be accompanied by the disposal of industrial waste of various generation. Therefore, the paper proposes the principles of controlling the strength properties of concrete, which consist in the complex effect of wollastonite obtained from boron production waste on the processes of structure formation of the cement matrix. When this introduced in an amount of 2-8 wt. % wollastonite has a dual function as a mineral filler and a reinforcing fiber. It has been proven that in the presence of wollastonite, the concrete mix becomes lighter without reducing its physical and mechanical properties. It was revealed that the early strength for all the developed compositions with the addition of wollastonite increases due to the acceleration of hydration processes. Calcium silicate, which is wollastonite CaSiO3, has a close chemical composition with cement clinker, especially with Ca2SiO4 belite and Ca3SiO5 alite. This leads to the formation of a chemically homogeneous and, as a result, hardened microstructure. Elongated wollastonite fibers with good adhesion to the cement stone provide effective micro-reinforcement of the concrete composite. Using the results will lead to the possibility of designing high-strength concretes, including for special structures

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