Properties of PVA-reinforced cement-bonded fiberboards processed with calender extrusion

2015 ◽  
Vol 22 (5) ◽  
Author(s):  
Bekir Y. Pekmezci
Keyword(s):  
Mechanical Properties ◽  
Three Dimensional ◽  
Flexural Properties ◽  
Cement Composites ◽  
Screw Head ◽  
Freeze Thaw ◽  
Novel Technique ◽  
Reinforced Cement ◽  
Pull Through ◽  
Pva Fiber

AbstractThis research investigates the application of calender extrusion as a novel technique in the production of cement fiberboards. The technique is successfully used in the production of non-structural building elements. The properties of the produced composites are discussed in this paper, particularly with regards the polyvinyl alcohol (PVA) fiber used in the study. The research involves an experiment to examine the mechanical properties and microstructure of the composites, and the results indicate that calender extrusion is a promising method for the production of thin and wide cement composites. These products can be shaped into various three-dimensional forms in the green state after processing. Based on the results, the mechanical properties of cement-bonded fiberboards vary with processing direction due to the alignment of fibers. Fiber content is the most significant factor with regards the tensile and flexural properties of fiber-reinforced cementitious products processed with calender extrusion. Moreover, processed composites have adequate screw head pull-through and freeze-thaw resistance.

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.

Thermal Properties of PVA-Fiber Reinforced Cement Composites at High Temperatures

2013 ◽  
Vol 377 ◽  
pp. 45-49 ◽  
Author(s):  
Eva Vejmelková ◽  
Robert Černý
Keyword(s):  
High Temperature ◽  
Cement Composites ◽  
Transient Method ◽  
Fiber Reinforced ◽  
Sample Heating ◽  
Vacuum Saturation ◽  
Reinforced Cement ◽  
Saturation Method ◽  
Temperature Exposure ◽  
Pva Fiber

Properties of polyvinyl alcohol-fiber reinforced cement composites are investigated as functions of temperature up to 1000 °C. Basic physical properties are measured using the water vacuum saturation method. High-temperature thermal diffusivity is determined by a transient method based on the analysis of temperature field at one-sided sample heating. High-temperature specific heat capacity is obtained using a non-adiabatic method. Experimental results show that the studied material exhibits a satisfactory resistance to high-temperature exposure and has a potential for using in high-temperature applications in building industry.

Heating and Mechanical Properties of MWCNT Reinforced Cement Composites

2021 ◽  
Vol 33 (1) ◽  
pp. 49-56
Author(s):  
Soon-Jo Ga ◽  
Sung-Won Yoo ◽  
Young Cheol Choi
Keyword(s):  
Mechanical Properties ◽  
Cement Composites ◽  
Reinforced Cement

Hydric and mechanical properties of carbon fiber reinforced cement composites subjected to thermal load

2004 ◽  
Vol 18 (8) ◽  
pp. 567-578 ◽  
Author(s):  
Jaroslava Drchalová ◽  
Eva Mňahončáková ◽  
Roman Vejmelka ◽  
Jiřı́ Kolı́sko ◽  
Patrik Bayer ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Fiber ◽  
Thermal Load ◽  
Cement Composites ◽  
Fiber Reinforced ◽  
Reinforced Cement ◽  
Carbon Fiber Reinforced

Microstructure and Mechanical Performance of Fiber-Reinforced Cement Composites Made with Nucleating-Agent Activated Coal-Fired Power Plant Bottom Ash

2020 ◽  
Vol 302 ◽  
pp. 85-92 ◽  
Author(s):  
Passakorn Sonprasarn ◽  
Parinya Chakartnarodom ◽  
Nuntaporn Kongkajun ◽  
Wichit Prakaypan
Keyword(s):  
Mechanical Properties ◽  
Power Plant ◽  
Bottom Ash ◽  
Cellulose Fiber ◽  
Nucleating Agent ◽  
Modulus Of Rupture ◽  
Cement Composites ◽  
Fiber Reinforced ◽  
Activated Coal ◽  
Reinforced Cement

The purpose of this work was to study the microstructure and the mechanical properties of the fiber-reinforced cement composites that used the nucleating-agent activated coal-fired power plant bottom ash as a raw material in the mixture for producing the composites. The raw materials for producing the fiber reinforced cement composites were the ordinary Portland cement (OPC), natural gypsum, cellulose fiber, and bottom ash. The bottom ash was chemically treated by the nucleating agent, a chemical that was prepared by the precipitation process from the aqueous solutions of sodium silicate (Na2SiO3) and calcium nitrate (Ca (NO3)2). To prepare the samples, the mixture consisting of 34.75 wt% OPC, 34.75 wt% bottom ash, 25 wt% natural gypsum, and 5.5 wt% cellulose fiber was mixed with the nucleating agent at the amount of 0 to 4.5 % of OPC weight in the mixture, and water to form the slurry. Then, the samples were produced by filter pressing process and cured in the autoclave for 16 hrs at 180 °C, and 10 bars. The mechanical properties of the samples including modulus of rupture (MOR), modulus of elasticity (MOE), and toughness were characterized by the universal testing machine (UTM). The microstructures of the samples were observed by scanning electron microscope (SEM). The results showed that the utilization of nucleating agent affect the microstructure of the sample leading to the improvement in the mechanical properties of samples.

scholarly journals Effect of Expansive Admixtures on the Shrinkage and Mechanical Properties of High-Performance Fiber-Reinforced Cement Composites

2013 ◽  
Vol 2013 ◽  
pp. 1-11 ◽  
Author(s):  
Won-Chang Choi ◽  
Hyun-Do Yun
Keyword(s):  
Mechanical Properties ◽  
High Performance ◽  
Shrinkage Strain ◽  
Cement Composites ◽  
Fiber Reinforced ◽  
Calcium Sulfoaluminate ◽  
High Performance Fiber ◽  
Reinforced Cement ◽  
Shrinkage Compensation ◽  
Direct Tensile

High-performance fiber-reinforced cement composites (HPFRCCs) are characterized by strain-hardening and multiple cracking during the inelastic deformation process, but they also develop high shrinkage strain. This study investigates the effects of replacing Portland cement with calcium sulfoaluminate-based expansive admixtures (CSA EXAs) to compensate for the shrinkage and associated mechanical behavior of HPFRCCs. Two types of CSA EXA (CSA-K and CSA-J), each with a different chemical composition, are used in this study. Various replacement ratios (0%, 8%, 10%, 12%, and 14% by weight of cement) of CSA EXA are considered for the design of HPFRCC mixtures reinforced with 1.5% polyethylene (PE) fibers by volume. Mechanical properties, such as shrinkage compensation, compressive strength, flexural strength, and direct tensile strength, of the HPFRCC mixtures are examined. Also, crack width and development are investigated to determine the effects of the EXAs on the performance of the HPFRCC mixtures, and a performance index is used to quantify the performance of mixture. The results indicate that replacements of 10% CSA-K (Type 1) and 8% CSA-J (Type 2) considerably enhance the mechanical properties and reduce shrinkage of HPFRCCs.

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