Sustainable cement mortar with recycled plastics enabled by the matrix-aggregate compatibility improvement

2022 ◽  
Vol 318 ◽  
pp. 125994
Author(s):  
Ahmed Al-Mansour ◽  
Shan Chen ◽  
Chengji Xu ◽  
Yu Peng ◽  
Jiyang Wang ◽  
...  
Keyword(s):  
Cement Mortar ◽  
The Matrix ◽  
Recycled Plastics

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.

scholarly journals STERIC EFFECT IN THE MATRIX OF THE FOAM CONCRETE

2020 ◽  
Vol 2018 (1) ◽  
pp. 121-122
Author(s):  
Andrey Savenkov ◽  
Ol'ga Yazina ◽  
Alena Ploskonosova ◽  
Egor Stafievskiy
Keyword(s):  
Compressive Strength ◽  
Steric Effect ◽  
Cement Mortar ◽  
Foam Concrete ◽  
The Matrix

The phenomenon of the steric effect in cement mortar of a hardening matrix of foam concrete is considered. The amount of reduction in compressive strength in a matrix of foam concrete of heat-insulating grades by density.

Study on the Technical Conditions of Old Newspaper(ONP)/ Recycled-Polypropylene(rPP) Composites

2012 ◽  
Vol 262 ◽  
pp. 418-421 ◽  
Author(s):  
Xiao Lin Zhang ◽  
Xiang Feng Bo
Keyword(s):  
Raw Materials ◽  
Flexural Modulus ◽  
Waste Recycling ◽  
Practical Significance ◽  
Molding Pressure ◽  
Elongation At Break ◽  
Plastic Composites ◽  
Recycled Polypropylene ◽  
The Matrix ◽  
Recycled Plastics

Use of resource-rich wastepaper/recycled plastics as raw materials in the production of wood-plastic composites(WPC) can alleviate the shortage of wood resources, reduce pollution and has a attractive prospect. In this paper, old newspaper fiber(ONPF)/recycled-polypropylene(rPP) Wood-Plastics Composite(WPC) was prepared by means of mixing processing and compression molding. The effects of technical conditions on the mechanical properties of WPC were investigated. The structure of composite was characterized by means of FTIR and SEM. The results show that, Wastepaper and waste-PP can be used as raw materials for preparation of WPC. The suitable preparation process for wastepaper/rPP composites was: wastepaper fiber 20%, blending temperature 175°C, blending time 15min, molding pressure 12MPa, molding temperature 175°C and molding time 10min. In these conditions, tensile strength and flexural strength of wastepaper/rPP composites are 23.6MPa and 28.8MPa respectively, increased by 20.9% and 12.6% compared to those of rPP matrix. The elongation at break of WPC is 10.6%, and the flexural modulus is 1328.9MPa，increased by 7.7% compared to those of rPP matrix. The structure analysis found that there is no chemical reaction between the fibers and the matrix. The research results have important practical significance in the field of printing and packaging waste recycling and utilization, environmental protection and energy saving.

scholarly journals Research on Crack Resistance of Semi-flexible Pavement Materials

2021 ◽  
Vol 248 ◽  
pp. 01020
Author(s):  
Wu Jiahong
Keyword(s):  
Low Temperature ◽  
Crack Resistance ◽  
Influencing Factors ◽  
Cement Mortar ◽  
Orthogonal Design ◽  
Flexible Pavement ◽  
Volume Stability ◽  
Pavement Materials ◽  
The Matrix ◽  
Matrix Porosity

Semi-flexible pavement has been widely used in China's road construction due to its excellent rutting resistance. Due to the large difference in volume stability between the matrix asphalt mixture and the cement mortar, the internal stress of the semi-flexible pavement material is concentrated and cracking is likely to occur. To explore the influence of different Influencing factors on the cracking resistance of semi-flexible pavement materials. This paper used the orthogonal design method to design the mix ratio of ordinary cement mortar. On this basis, admixtures (silica fume, ordinary emulsified asphalt, water-based epoxy resin) were added to prepare special cement mortar. Then, using cement mortar type, matrix porosity, matrix asphalt type, matrix aggregate type as the influencing factors, this article has studied his influence on the crack resistance of semi-flexible pavement materials. Tests show that cement mortar type, matrix porosity, matrix asphalt type, matrix aggregate type have varying degrees of influence on the crack resistance of semi-flexible pavement. The effect of matrix porosity on low temperature crack resistance is the greatest, followed by asphalt and cement mortar types, and the lowest by aggregate type. Enhancing the flexibility of cement mortar and enhancing the elastoplasticity of the matrix are conducive to improving the low-temperature performance of semi-flexible pavements.

scholarly journals Effect of Recycled Plastic in Mortar and Concrete and the Application of Gamma Irradiation - A Review

2018 ◽  
Vol 65 ◽  
pp. 05027 ◽  
Author(s):  
Aliyu Usman ◽  
Muslich Hartadi Sutanto ◽  
Madzlan Napiah
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Compressive Strength ◽  
Cement Mortar ◽  
Plastic Waste ◽  
Waste Plastic ◽  
Detailed Review ◽  
Concrete Production ◽  
Recycled Plastics ◽  
Recycled Waste

The utilization of a large amount of waste in concrete production is considered the best alternative for solving the issues associated with improper disposal. Plastic waste is considered as one of such waste and could be utilized in several applications. The drawback associated with the utilization of a large amount of plastic waste is the decrease in the mechanical properties of the mortar or concrete as the case may be. This paper presents a detailed review about waste recycled plastics and research published on the effect of non-irradiated recycled plastic on the mechanical properties of cement mortar and cement concretes as either fillers or aggregates and the application of gamma radiation on the recycled plastic waste. The effect of recycled waste plastic on compressive strength, flexural strength and splitting tensile strength is discussed in this paper.

Application of Styrene-Butadiene Rubber in Cement-Based Materials

2011 ◽  
Vol 306-307 ◽  
pp. 588-593 ◽  
Author(s):  
Ru Wang ◽  
Pei Ming Wang
Keyword(s):  
Water Retention ◽  
Water Adsorption ◽  
Cement Hydration ◽  
Cement Mortar ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Calcium Silicate Hydrates ◽  
Cement Based Materials ◽  
The Matrix ◽  
Styrene Butadiene

This paper summarizes the function of styrene-butadiene rubber (SBR) in cement-based materials, focusing on the achievements of the authors in recent years. The effect of SBR on the properties of cement mortar is introduced, i.e. the workability of fresh mortar such as the water-reduction and water-retention effects of SBR, the mechanical properties of hardened mortar such as the tensile bond strength, flexural and compressive strengths, flexibility and anti-impacting capacity, the waterproofness such as the capillary water adsorption and anti-penetration capacity, the microstructure such as the matrix structure and interface structure, and the cement hydration such as the calcium silicate hydrates, calcium aluminate hydrates and polymerization of [SiO4]4- tetrahedron.

scholarly journals Study on toughness and toughening mechanism of cement-based fiber materials

2019 ◽  
Vol 275 ◽  
pp. 02019
Author(s):  
Huixiao Hu ◽  
Qiang Li ◽  
Lu Cao
Keyword(s):  
Cement Mortar ◽  
Peak Load ◽  
Great Influence ◽  
Test Block ◽  
Flexural Test ◽  
Length Increase ◽  
The Matrix ◽  
Fiber Materials ◽  
Local Materials ◽  
Load Deflection Curve

In order to improve the character of common cement mortar which are brittle and easily cracked, andtotake advantage of the local materials, abandoned fishing nets was used toform get the cement-based fiber materials. In this study, the influence of the amount and length of abandoned fishing nets on the mechanical properties of cement mortar and its mechanism were discussed. Four different lengths of abandoned fishing nets were adopted under four kinds of dosages to mix with mortar and make a total of 16 test blocks. Then the flexural strengths of the prepared test blocks were tested, and the load-deflection curve of the test block was obtained. The results showthat the residual strength after the test block after which reachesthe peak load in the flexural test generally increases with the increase of the fiber content and the length of the fiber, but when the dosage and length increase to a certain range, the influences becomecomplicated. The crack propagation simulation byAbaqus further revealed the reinforcement mechanism, and it can be concluded thatthe bridging between the fiber and the matrix has a great influence on the character toughness.

A Novel Approach to Determine the Elastic Properties of the Interphase between the Aggregate and the Cement Paste

2011 ◽  
Vol 462-463 ◽  
pp. 680-685 ◽  
Author(s):  
Hong Chang Qu ◽  
Peng Zhang
Keyword(s):  
Shear Modulus ◽  
Elastic Properties ◽  
Cement Paste ◽  
Cement Mortar ◽  
Interfacial Transition Zone ◽  
Spherical Particles ◽  
Novel Approach ◽  
Three Phase ◽  
The Matrix ◽  
Consistent Method

Concrete is a three-phase material consisting of cement paste matrix, discrete inclusions of sand (aggregate), and an interfacial transition zone (ITZ) between the matrix and the inclusions. In order to calculate the elastic properties of the ITZ of cement mortar, We model the material as a composite formed by a matrix with embedded spherical particles; each surrounded by a concentric spherical shell. With help of the generalized self-consistent method (GSCM), equations of bulk modulus and shear modulus of ITZ are deduced, and Elastic properties of ITZ are computed by using experimentally known elastic properties of the composite. It is found that the shear modulus of ITZ is about 50% of that of the cement paste matrix.

Influence of the Anchorage of PBO-FRCM Composites on the Effectiveness of Behaviour of Shearing Beams

2016 ◽  
Vol 866 ◽  
pp. 129-133
Author(s):  
Dorota Urbańska ◽  
Tomasz Trapko ◽  
Michał Musiał ◽  
Tomasz Kowalik
Keyword(s):  
Reinforced Concrete ◽  
Laboratory Tests ◽  
Concrete Beams ◽  
Cement Mortar ◽  
Shear Capacity ◽  
Reinforced Concrete Beams ◽  
Rc Beams ◽  
Matrix Layer ◽  
The Matrix ◽  
Slip Phenomenon

The shear capacity of reinforced concrete beams strengthened with cement based composite materials (FRCM system) was investigated in this paper. The analysis refers to PBO-FRCM system made by PBO fibres (p-Phenylene Benzobis Oxazole) and cement based mortar. The use of cement mortar is connected with the slip phenomenon that occurs between the matrix layer and the fibres. This phenomenon leads to premature debonding of the ends of the composite and the loss of the shear capacity. To prevent this, designed end-anchorage systems is needed. Therefore, the laboratory tests on reinforced concrete beams strengthened in a shear with PBO-FRCM system were conducted. At this aim tests on three strengthened RC beams with different end-anchorages systems have been preformed and obtained results discussed. The experimental results revealed that the use of FRCM composites increased the shear capacity and construction of end-anchorage of composite had an impact on shear capacity.

Microstructural Analysis of Paste and Interfacial Transition Zone in Cement Mortars Modified with Water-Soluble Polymers

2011 ◽  
Vol 466 ◽  
pp. 21-28 ◽  
Author(s):  
Elke Knapen ◽  
Dionys Van Gemert
Keyword(s):  
Transition Zone ◽  
Cement Mortar ◽  
Microstructural Analysis ◽  
Interfacial Transition Zone ◽  
Water Soluble ◽  
Water Soluble Polymers ◽  
Soluble Polymers ◽  
Cement Mortars ◽  
The Matrix ◽  
Mixing Water

The presence of water-soluble polymers affects the microstructure of polymermodified cement mortar. Such effects are studied by means of SEM investigation. Polyvinyl alcohol-acetate (PVAA), Methylcellulose (MC) and Hydroxyethylcellulose (HEC) are applied in a 1 % polymer-cement ratio. The polymers provide an improved dispersion of the cement particles in the mixing water. The tendency of certain water-soluble polymers to retard the flocculation of the cement particles minimizes the formation of a water-rich layer around the aggregate surfaces. They also provide a more uniform distribution of unhydrated cement particles in the matrix, without significant depletion near aggregate surfaces. Both effects enable to reduce the interfacial transition zone (ITZ). The polymers also provide a more cohesive microstructure, with a reduced amount of microcracks.

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