Uniaxial compression mechanical properties and fracture characteristics of brucite fiber reinforced cement-based composites

2019 ◽  
Vol 212 ◽  
pp. 148-158 ◽  
Author(s):  
Yuanyi Yang ◽  
Yi Deng ◽  
Xingkui Li
Keyword(s):  
Mechanical Properties ◽  
Uniaxial Compression ◽  
Fiber Reinforced ◽  
Fracture Characteristics ◽  
Reinforced Cement

scholarly journals Crack Resistance and Mechanical Properties of Polyvinyl Alcohol Fiber-Reinforced Cement-Stabilized Macadam Base

2020 ◽  
Vol 2020 ◽  
pp. 1-15
Author(s):  
Yi Zhao ◽  
Xuan Yang ◽  
Qingyu Zhang ◽  
Naixing Liang ◽  
Yangkai Xiang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Polyvinyl Alcohol ◽  
Crack Resistance ◽  
Fiber Length ◽  
Cement Content ◽  
Strength Test ◽  
Fiber Reinforced ◽  
Polyvinyl Alcohol Fiber ◽  
Reinforced Cement ◽  
Shrinkage Property

A series of tests were carried out to evaluate crack resistance and mechanical properties of polyvinyl alcohol fiber-reinforced cement-stabilized macadam, which is widely used as pavement base or subbase composite material. Three series of cement-stabilized macadam mixtures with cement content of 3.2%, 3.6%, and 4.0% were prepared by incorporating four various contents (0, 0.6, 0.9, and 1.2 kg/m3) and lengths (12, 18, 24, and 30 mm) of polyvinyl alcohol fiber. The optimum polyvinyl alcohol fiber content, fiber length, and cement content were determined based on the mechanical properties of cement-stabilized macadam mixtures. Then, unconfined compressive strength test, compressive resilience modulus test, splitting strength test, flexural tensile strength test, drying shrinkage test, and temperature shrinkage test were carried out in this study. The results show that polyvinyl alcohol fiber-reinforced cement-stabilized prepared by optimum proportions (cement 3.6%, fiber content 0.9 kg/m3, and fiber length 24 mm) has good crack resistance. The incorporation of polyvinyl alcohol fiber can effectively improve compressive strength and splitting strength, while its effect on CRM of cement-stabilized macadam is not remarkable. The anti-dry-shrinkage property and anti-temperature-shrinkage property of the specimens are also drastically improved due to the reinforcement effect of polyvinyl alcohol fiber. Moreover, the crack resistance index is proposed to evaluate the crack resistance of materials. The crack resistance of PVA fiber-reinforced cement-stabilized macadam prepared by optimum proportions is improved by 44.4%. Consequently, the mechanical properties and crack resistance of cement-stabilized macadam are obviously improved by adding polyvinyl alcohol fiber.

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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