Complete Experimental Investigation for Short Polypropylene Fiber Reinforced Cement Mortars

2021 ◽  
Vol 902 ◽  
pp. 161-168
Author(s):  
Nikolaos D. Nikoloutsopoulos ◽  
Zacharias G. Pandermarakis ◽  
Aikaterini Papadioti ◽  
Panagiotis Douvis
Keyword(s):  
Polypropylene Fiber ◽  
Drying Shrinkage ◽  
Theoretical Models ◽  
Volume Percentage ◽  
Peak Response ◽  
Air Content ◽  
Cement Mortars ◽  
Reinforced Cement ◽  
Compressive And Flexural Strengths ◽  
Experimental Values

In this study we investigate the addition of short polypropylene (PP) fibers in cement mortars for a wide volume percentage range. These fibers are dispersed easily in fresh mortar and create a dense network, whereas have as result the cracking reduction during dry shrinkage and the improvement of post peak response. A modified superplasticizer by lignosulfonate polymers basis was used, that keeps at low level the water to cement ratio and thus resulting to an improved mortar’s workability. Compressive strength, three-point flexural strength, drying shrinkage of hardened mortar, flow table test and air content of fresh mortar were studied in a range of volume percentages. The experimental response according to volume percentage was approximated by suitably attached theoretical models. The comparison of the obtained experimental values was done with unreinforced specimens as reference samples. From results elaboration it is concluded that the addition of PP fibers in cementitious mortars improves mortars post-peak response but weaken their compressive and flexural strengths and worsen their workability.

Strength of Polypropylene Fiber Reinforced Cement Mortar Composites with Variable Water/Cement Ratio

2021 ◽  
Vol 1042 ◽  
pp. 157-163
Author(s):  
Nikolaos D. Nikoloutsopoulos ◽  
Sofia P. Nikolopoulou ◽  
Zacharias G. Pandermarakis
Keyword(s):  
Mechanical Response ◽  
Natural Fibers ◽  
Polypropylene Fiber ◽  
Short Fiber ◽  
Fiber Reinforced ◽  
Air Content ◽  
Wide Range ◽  
Curing Shrinkage ◽  
Reinforced Cement ◽  
Variable Water

For cement mortars the reinforcement techniques by randomly distributed short fibers, contribute highly to their micro-cracking stabilization and to improvement of their flexibility and tensile strength. Among the wide different types of short fiber reinforcement that have been used in the past for mortars, those made of steel, polymers and natural fibers dominate the area. It is a common sense that the reinforcement of mortars by polypropylene fibers (PP) is considered a very efficient method for reducing their curing shrinkage and enhanced toughness and strength of un-reinforced cemented material. In this study, PP fiber reinforced mortars were prepared with specific composition but with variable water to cement (W/C) ratio and appropriate superplasticizer amounts. For all mixtures their workability, air content and flexural and compressive strengths were measured. In conclusion it can be stated that even though W/C ratio of mortars is varied considerably, and also do their mechanical response, it is possible by appropriate mixture designing, for all studied compositions to produce suitable mortars that can be used successfully in a wide range of demands and applications, achieving high mortar strengths and ideal workability behavior.

Polypropylene fiber reinforced cement mortars containing rice husk ash and nano-alumina

2016 ◽  
Vol 111 ◽  
pp. 429-439 ◽  
Author(s):  
Ehsan Mohseni ◽  
Mojdeh Mehrinejad Khotbehsara ◽  
Farzad Naseri ◽  
Maryam Monazami ◽  
Prabir Sarker
Keyword(s):  
Rice Husk ◽  
Rice Husk Ash ◽  
Polypropylene Fiber ◽  
Fiber Reinforced ◽  
Cement Mortars ◽  
Nano Alumina ◽  
Reinforced Cement

Fluid Transport Mechanisms in Portland Cement Mortar Modified with PVA and Nano Montmorillonite

2013 ◽  
Vol 687 ◽  
pp. 311-315 ◽  
Author(s):  
Teresa María Piqué ◽  
Luis Fernandez Luco ◽  
Analía Vázquez
Keyword(s):  
Tensile Strength ◽  
Portland Cement ◽  
Construction Industry ◽  
Fluid Transport ◽  
Cement Mortar ◽  
Drying Shrinkage ◽  
Cement Matrix ◽  
Poly Vinyl Alcohol ◽  
Cement Mortars ◽  
Compressive And Flexural Strengths

The development of new materials for specific applications is an increasing field in the construction industry, so is the employment of nanotechnology for this goal. When poly(vinyl alcohol) (PVA) is added to a Portland cement mortar, a film is formed in between the hydration products. This film has low elasticity modulus and high tensile strength and it enhances the mortar’s mechanical properties in the fresh and hardened states. The addition of nano montmorillonites (MMT) gives the polymer a better compatibility with the cement matrix. In this work, the changes in the microstructure of Portland cement mortars modified with PVA and PVA with MMT are assessed by means of transport of fluids capacity as an indicator. The reference is a standard mortar according to EN 196-1. The parameters measured are: weight loss under drying and air permeability. Complementary measures, such as compressive and flexural strengths and drying shrinkage have also been performed. From the obtained results, it can be concluded that the inclusion PVA + MMT to Portland cement mortar doesn’t affect the microstructure, when compared with Portland cement mortar with PVA, and even increase its tensile strength.

scholarly journals Mechanical Properties of Basalt-Based Recycled Aggregate Concrete for Jeju Island

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5429
Author(s):  
Hong-Beom Choi ◽  
Jin-O Park ◽  
Tae-Hyun Kim ◽  
Kyeo-Re Lee
Keyword(s):  
Mechanical Performance ◽  
Drying Shrinkage ◽  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
Superior Performance ◽  
Recycled Aggregates ◽  
Replacement Ratio ◽  
Volume Percentage ◽  
Air Content

Recycled aggregate is essential to protect Jeju Island’s natural environment, but waste concrete, including porous basalt, is a factor that lowers the quality of recycled aggregate. Therefore, an experiment was conducted to analyze the properties of concrete application of basalt-based recycled aggregate (B-RA) through quality improvement. The absorption of the B-RA ranged from 3–5%; restricting its absorption to less than 3% was challenging owing to its porosity and irregular shape. However, the increase in the solid volume percentage of the concrete when replacing 25 or 50% of fresh basalt aggregate with recycled basalt aggregate improved the mechanical performance of the concrete, especially at 25%, for which a compressive strength of 55.9 MPa and modulus of elasticity of 25.9 GPa exceeded those of concrete with fresh basalt aggregate. Moreover, increasing the replacement ratio of the fresh basalt with recycled aggregate reduced the slump and decreased the air content, consequently increasing the concrete drying shrinkage. However, the replacement of fresh basalt aggregate with recycled basalt aggregate unaltered the mechanical performance of the concrete. The results indicate that efficient use of recycled aggregates can yield superior performance to that of fresh basalt, irrespective of aggregate quality.

The Role of Nano-SiO2 Addition in the Mechanical Properties of RHA Composite Cement Mortars

2011 ◽  
Vol 346 ◽  
pp. 18-25 ◽  
Author(s):  
Ali Sadrmomtazi ◽  
A. Fasihi
Keyword(s):  
Water Absorption ◽  
Rice Husk Ash ◽  
Drying Shrinkage ◽  
Cement Composite ◽  
Sem Analysis ◽  
Absorption Properties ◽  
Cement Mortars ◽  
Water Absorption Test ◽  
Compressive And Flexural Strengths

This paper presents a laboratory study on the properties of rice husk ash (RHA) cement composite mortars incorporating nano-SiO2. Different amounts of nano-SiO2 (0%, 1%, 3% and 5%) were incorporated into the mortars with 20% replacement of RHA. The compressive and flexural strengths of mortars were tested at 7, 28, 60 and 90 days. The water absorption test carried out at 28 days. The drying shrinkage of mortars was measured up to the age of 42 days. Scanning electron microscopy (SEM) observation also conducted to evaluate the effect of nano-SiO2 on microstructure of cement paste containing RHA. Incorporating nano-SiO2 into RHA mortars significantly improved the mechanical strength and water absorption properties of the products. Nano-SiO2 increased the drying shrinkage of RHA mortars. SEM analysis showed that nano-SiO2 improved the microstructure of RHA pastes on dense and compact form.

scholarly journals A Textile Waste Fiber-Reinforced Cement Composite: Comparison between Short Random Fiber and Textile Reinforcement

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3742
Author(s):  
Payam Sadrolodabaee ◽  
Josep Claramunt ◽  
Mònica Ardanuy ◽  
Albert de la Fuente
Keyword(s):  
Construction Material ◽  
Drying Shrinkage ◽  
Cement Composite ◽  
Nonwoven Fabric ◽  
Textile Waste ◽  
Nonwoven Fabrics ◽  
Potential Applications ◽  
Reinforced Cement ◽  
The One ◽  
Garment And Textile

Currently, millions of tons of textile waste from the garment and textile industries are generated worldwide each year. As a promising option in terms of sustainability, textile waste fibers could be used as internal reinforcement of cement-based composites by enhancing ductility and decreasing crack propagation. To this end, two extensive experimental programs were carried out, involving the use of either fractions of short random fibers at 6–10% by weight or nonwoven fabrics in 3–7 laminate layers in the textile waste-reinforcement of cement, and the mechanical and durability properties of the resulting composites were characterized. Flexural resistance in pre- and post-crack, toughness, and stiffness of the resulting composites were assessed in addition to unrestrained drying shrinkage testing. The results obtained from those programs were analyzed and compared to identify the optimal composite and potential applications. Based on the results of experimental analysis, the feasibility of using this textile waste composite as a potential construction material in nonstructural concrete structures such as facade cladding, raised floors, and pavements was confirmed. The optimal composite was proven to be the one reinforced with six layers of nonwoven fabric, with a flexural strength of 15.5 MPa and a toughness of 9.7 kJ/m2.

Experimental evaluation on engineering properties and microstructure of the high-performance fiber-reinforced mortar with low polypropylene fiber content

2021 ◽  
Vol 72 (7) ◽  
pp. 824-840
Author(s):  
Hung Vu Viet ◽  
Cuong Nguyen Tuan ◽  
Duy Nguyen Huu ◽  
Tho Ngo Nguyen Ngoc ◽  
Phuoc Huynh Trong
Keyword(s):  
High Performance ◽  
Polypropylene Fiber ◽  
Cost Effective ◽  
Fiber Content ◽  
Engineering Properties ◽  
Fiber Reinforced ◽  
Cement Mortars ◽  
High Performance Fiber ◽  
New Construction ◽  
Local Materials

Recently, high-performance fiber-reinforced mortar/concrete (HPFRM) has been researched and developed in many fields such as repair, maintenance, and new construction of infrastructure works due to its high strain capacity and tight crack width characteristics. Optimizing the design of mixture proportions and structures using HPFRM is still a complex mechanical and physical process, depending on the design principles, specific site conditions, and their local materials. This study aims to develop an HPFRM with low polypropylene fiber content by using locally available ingredients in Southern Vietnam to address the deficiencies commonly observed in traditional cement grout mortars. Three mixture proportions were prepared with different water-to-binder (w/b) ratios of 0.2, 0.25, and 0.3. Then, the performance of HPFRM was evaluated in both fresh and hardened stages. Additionally, the microstructural characteristics of each mix design were also assessed through scanning electron microscope observation. The experimental results showed that the optimum w/b of 0.25 and a fixed dosage of 0.6% polypropylene fiber produced positive impacts on the rheological, mechanical properties, and also ductility of the high-performance mortar. It was concluded that HPFRMs are promising for cost-effective and sustainable cement mortars.

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