Effect of Raw Sugarcane Bagasse Ash as Sand Replacement on the Fiber-Bridging Properties of Engineered Cementitious Composites

2021 ◽  
pp. 036119812110237
Author(s):  
Sujata Subedi ◽  
Gabriel A. Arce ◽  
Marwa M. Hassan ◽  
Michele Barbato ◽  
Louay N. Mohammad
Keyword(s):  
Sugarcane Bagasse ◽  
Fiber Volume Fraction ◽  
Volume Fraction ◽  
Tensile Ductility ◽  
Strength Index ◽  
Single Crack ◽  
Fiber Volume ◽  
Fiber Bridging ◽  
Sugarcane Bagasse Ash ◽  
Pva Fiber

The use of raw sugarcane bagasse ash (SCBA) as sand replacement in the production of engineered cementitious composites (ECCs) can improve its cost-effectiveness and practicality. A recent study by the authors showed that the use of raw SCBA as a replacement to sand in ECC mixtures substantially enhances the tensile ductility and provides mild improvements in tensile strength; however, it also indicated a need to further elucidate the mechanisms producing such improvements. Therefore, the present study examined the effects of raw SCBA as a sand replacement in ECC’s fundamental fiber-bridging relationship, [Formula: see text], through single crack tensile test (SCTT) using 1% polyvinyl alcohol (PVA) fiber volume fraction. The PVA fiber volume fraction was reduced from 1.5% in the previous study to 1% in this study to ensure that a single crack was produced, which is a necessary condition to obtain the fundamental [Formula: see text] relationship. A total of five mixtures were evaluated at different replacement levels of sand with raw SCBA (i.e., 0%, 25%, 50%, 75%, and 100%). SCTT results revealed that raw SCBA produced minor effects on the fiber-bridging capacity but significantly increased the complementary energy ( [Formula: see text]). A positive correlation was observed between the pseudo strain-hardening (PSH) strength index and raw SCBA content. Since the PSH strength index was higher than the recommended value (i.e., 1.3) for robust PSH behavior, it was concluded that the main factor contributing to tensile ductility enhancements was the increase in the PSH energy index resulting from the notable increase of [Formula: see text] and potential decrease in matrix fracture toughness.

scholarly journals Influence of polyvinyl alcohol fiber and fly ash content on compressive creep properties of high ductility cementitious composites

2021 ◽  
Vol 272 ◽  
pp. 02014
Author(s):  
Bo Chen ◽  
Liping Guo ◽  
Lihui Zhang ◽  
Wenxiao Zhang ◽  
Yin Bai ◽  
...  
Keyword(s):  
Fly Ash ◽  
Polyvinyl Alcohol ◽  
Fiber Volume Fraction ◽  
Volume Fraction ◽  
Ash Content ◽  
Creep Model ◽  
High Ductility ◽  
Fiber Volume ◽  
Leading Role ◽  
Pva Fiber

The influence of polyvinyl alcohol (PVA) fiber volume fraction and fly ash content on the creep behavior of high ductility cementitious composites (HDCC) under compression was investigated. For this investigation, the creep behavior of four HDCC groups with cube compressive strength of 30–50 MPa, PVA fiber volume fraction of 1.5% and 2.0%, and fly ash content of 60% and 80% at 7 d and 28 d loading periods, respectively, were evaluated. A compressive creep model, which reflects the loading age and holding time, was established. The results revealed that when the load was applied at 7 d and 28 d, and then maintained for 245 d, the specific creep of HDCC ranged from 95×10-6/ MPa to 165×10-6/ MPa and from 59×10-6/ MPa to 135 × 10−6/ MPa, respectively. The corresponding creep coefficients ranged from 1.48 to 2.25 and from 1.10 to 1.94, respectively. The PVA fiber volume fraction and fly ash content were the main factors affecting the specific creep of HDCC, which increased with increasing fiber fraction and fly ash content. Under short-term loading, the fiber volume fraction played a leading role in the specific creep, and the fly ash content played the leading role during long-term loading. Furthermore, the specific creep and creep coefficient decreased significantly with increasing loading age. The classical creep model described by a power exponent function is suitable for HDCC.

Effect of Fiber Volume Fraction on Fatigue Crack Propagation Rate of UHTCC

2012 ◽  
Vol 450-451 ◽  
pp. 364-369
Author(s):  
Wen Liu ◽  
Shi Lang Xu ◽  
Qing Hua Li
Keyword(s):  
Fatigue Crack ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
Fiber Volume Fraction ◽  
Volume Fraction ◽  
Crack Propagation Rate ◽  
Propagation Rate ◽  
Fatigue Crack Propagation Rate ◽  
Fiber Volume ◽  
Pva Fiber

Fatigue flexural fracture test is taken out in this paper, to study the fatigue crack propagation rate of ultra-high toughness cementitious composites (UHTCC), as well as the effect of fiber volume fraction on fatigue crack propagation rate. Three fiber volume fractions are adopted: 1.5%, 2.0% and 2.5%. Similar to Paris law, a fatigue crack propagation equation of UHTCC is introduced, as dA/dN=C(△J)m, with the two parameters A and △J are defined as the covering area of multiple fatigue cracks and the fatigue amplitude of J integral. Through experiment and analysis, the fatigue crack propagation rate slows down with the increase of PVA fiber fraction. Furthermore, the influence of PVA fiber on the propagation rate was found to become obvious with the increase of J integral.

scholarly journals Experimental Investigation on the Quasi-Static Tensile Capacity of Engineered Cementitious Composites Reinforced with Steel Grid and Fibers

Materials ◽  
2019 ◽  
Vol 12 (17) ◽  
pp. 2666
Author(s):  
Li ◽  
Liu ◽  
Wu ◽  
Wu ◽  
Wu
Keyword(s):  
Tensile Strength ◽  
Energy Dissipation ◽  
Ultimate Tensile Strength ◽  
Fiber Volume Fraction ◽  
Volume Fraction ◽  
Fiber Reinforced ◽  
Fiber Volume ◽  
Kevlar Fiber ◽  
Static Tensile ◽  
Pva Fiber

An engineered cementitious composite (ECC) was reinforced with a steel grid and fibers to improve its tensile strength and ductility. A series of tensile tests have been carried out to investigate the quasi-static tensile capacity of the reinforced ECC. The quasi-static tensile capacities of reinforced ECCs with different numbers of steel-grid layers, types of fibers (Polyvinyl alcohol (PVA) fiber, KEVLAR fiber, and polyethylene (PE) fiber), and volume fractions of fibers have been tested and compared. It is indicated by the test results that: (1) On the whole, the steel grid-PVA fiber and steel grid-KEVLAR fiber reinforced ECCs have high tensile strength and considerable energy dissipation performance, while the steel grid-PE fiber reinforced ECC exhibits excellent ductility. (2) The ultimate tensile strength of the reinforced ECC can be improved by the addition of steel grids. The maximal peak tensile stress increase is about 50–95% or 140–190% by adding one layer or two layers of steel grid, respectively. (3) The ultimate tensile strength of the reinforced ECC can be enhanced with the increase of fiber volume fraction. For a certain kind of fiber, a volume fraction between 1.5% and 2% grants the reinforced ECC the best tensile strength. Near the ultimate loading point, the reinforced ECC exhibits strain hardening behavior, and its peak tensile stress increases considerably. The energy dissipation performance of the reinforced ECC can also be remarkably enhanced by such an increase in fiber volume fraction. (4) The ductility of the steel grid-PVA fiber reinforced ECC can be improved by the addition of steel grids and the increase of fiber volume fraction. The ductility of the steel grid-KEVLAR fiber reinforced ECC can be improved by the addition of steel grids alone. The ductility and energy dissipation performance of the steel grid-PE fiber reinforced ECC can be improved with the increase of fiber volume fraction alone. A mechanical model for the quasi-static initial and ultimate tensile strength of the steel grid-fiber reinforced ECC is proposed. The model is validated by the test data from the quasi-static tension experiments on the steel grid-PE fiber reinforced ECC.

scholarly journals Compression performance and bearing capacity calculation model of small-eccentricity columns strengthened with textile-reinforced mortar (TRM)

2019 ◽  
Vol 69 (335) ◽  
pp. 195
Author(s):  
S. P. Yin ◽  
X. Q. Hu ◽  
Y. T. Hua
Keyword(s):  
Bearing Capacity ◽  
Fiber Volume Fraction ◽  
Volume Fraction ◽  
Calculation Model ◽  
Longitudinal Reinforcement ◽  
Fiber Volume ◽  
Compression Performance ◽  
Proposed Model ◽  
Capacity Calculation ◽  
Pva Fiber

To study the compression performance of TRM-strengthened columns with small eccentricities, a total of 9 reinforced concrete (RC) columns with end corbels were subjected to compression testing. The test parameters are as follows: the number of textile layers, the ratio of longitudinal reinforcement, and polyvinyl alcohol (PVA) short-cut fiber volume fraction. The experimental results indicated that, compared to the control, columns with three layers of textile exhibited an approximately 10.66% increase in the bearing capacity. However, the effect increased only slightly when the number of textile layers increased to 4. Besides, the effect was improved with the increase in the ratio of longitudinal reinforcement and PVA fiber volume fraction. Finally, based on laboratory tests and related research results, a model for calculating normal section bearing capacity of TRM-strengthened columns with small eccentricities was presented. A comparison of the theoretical and experimental data demonstrated the applicability of the proposed model.

A STUDY ON MECHANICAL PROPERTIES OF PVA FIBER REINFORCED SUPER-LIGHTWEIGHT MORTAR

2010 ◽  
Vol 24 (15n16) ◽  
pp. 2543-2548
Author(s):  
SHIGEYUKI DATE ◽  
TETSURO KASAI
Keyword(s):  
Fiber Volume Fraction ◽  
Bending Strength ◽  
Volume Fraction ◽  
Impact Load ◽  
Total Surface Area ◽  
Fiber Volume ◽  
Mix Proportion ◽  
Pva Fiber ◽  
The Impact ◽  
Lightweight Mortar

In this study, not only bending strength of Super-lightweight mortar (SLM) but also resistance to impact load of it, with several types of PVA fibers of different lengths and diameters, were investigated. It was shown that, when the diameter of the fiber decreased and fiber-volume fraction increased, bending strength and resistance to the impact load were generally improved. However, the effect of the performance improvement of the SLM showed the tendency to become small in mix proportion that has too large total surface area of fiber.

scholarly journals Effects of nanosilica to improve the mechanical, electrical and durability properties of fiber-reinforced high-volume processed sugarcane bagasse ash cement mortar

2021 ◽  
Author(s):  
Ramasamy Gopalakrishnan ◽  
RAVI KAVERI ◽  
A JohnKirubahar
Keyword(s):  
Sugarcane Bagasse ◽  
Cement Mortar ◽  
Weight Ratio ◽  
Volume Ratio ◽  
High Volume ◽  
Fiber Reinforced ◽  
Fiber Volume ◽  
Sugarcane Bagasse Ash ◽  
Pva Fiber ◽  
The Impact

Abstract Nanosilica (NS) has attracted wide variety of usage as cement ingredients. While many other studies have focused on early cement hydration and hardening properties, there is less data available on the impact of NS on the behavior of fiber-reinforced high-volume sugarcane bagasse cement mortar (HVSCBAM). The effects of NS on the fiber-reinforced durability of HVSCBAM, having the properties of sugarcane bagasse ash/binder in an average of 50% by weight, have been presented in detail in this study. Four NS/binder weight ratio dosages of 0%, 0.5%, 1.0% and 1.5% of and another four total PVA fiber/volume ratio dosages of 0%, 0.2%, 0.5% and 1.0% were used. Compared to 0.2-1 vol.% of PVA fiber–reinforced HVSCBAM, the 1.5 wt.% of NS would enhance the compressive strength further. Various reports on mineralogy and microstructure have demonstrated that NS facilitates fiber/matrix bonding. These conclusions provide an insight into the pozzolanic materials of cement that are used in a large volume in the designs and applications of nanoparticles.

Experimental Study on Early Anti-Cracking Properties of Polyvinyl Alcohol Fiber Reinforced Cementitious Composites

2010 ◽  
Vol 34-35 ◽  
pp. 1445-1448 ◽  
Author(s):  
Shu Guang Liu ◽  
Cun He ◽  
Chang Wang Yan ◽  
Xiao Ming Zhao
Keyword(s):  
Polyvinyl Alcohol ◽  
Crack Width ◽  
Fiber Volume Fraction ◽  
Volume Fraction ◽  
Cementitious Composites ◽  
Fiber Volume ◽  
Polyvinyl Alcohol Fiber ◽  
Maximum Crack ◽  
Pva Fiber ◽  
Fiber Reinforced Cementitious Composites

This paper mainly studies early anti-cracking of cementitious composites containing polyvinyl alcohol (PVA) fiber and fly ash (FA). The PVA fibers were added at the volume fractions of 0%, 0.25%, 0.5%, 1.0% and 2.0%. The percentages of FA used in the experiment were 0% and 15%. Experimental results show that the maximum crack width and total crack area can be reduced with the increase of volume fraction of PVA fiber, and that no crack appeared at the volume fraction of 2.0%. The reducing tendency of crack width and total crack area kept constant with addition of FA, but reducing amplitude decreased. When the PVA fiber volume fraction remains constant, the early anti-cracking properties of cementitious composites containing PVA fiber and common cement are superior to one containing PVA fiber and FA. Conclusions can be drawn that the early anti-cracking properties of cementitious composites can be improved by PVA fiber.

Study on Optimized PVA Fiber-Volume Fraction for Polymer Cement Mortar

2020 ◽  
Vol 11 (3) ◽  
pp. 25-31 ◽  
Author(s):  
Sardorbek Rustamov ◽  
◽  
Sang-Woo Kim ◽  
Min-Ho Kwon ◽  
Jin-Sup Kim
Keyword(s):  
Fiber Volume Fraction ◽  
Volume Fraction ◽  
Cement Mortar ◽  
Fiber Volume ◽  
Pva Fiber

Monitoring of mechanical properties of prestressed glass fiber epoxy composites over 12 months after fabrication

2021 ◽  
pp. 002199832110047
Author(s):  
Mahmoud Mohamed ◽  
Siddhartha Brahma ◽  
Haibin Ning ◽  
Selvum Pillay
Keyword(s):  
Mechanical Properties ◽  
Residual Stress ◽  
Flexural Strength ◽  
Compressive Residual Stress ◽  
Fiber Volume Fraction ◽  
Volume Fraction ◽  
Epoxy Composites ◽  
Flexural Properties ◽  
Initial Increase ◽  
Fiber Volume

Fiber prestressing during matrix curing can significantly improve the mechanical properties of fiber-reinforced polymer composites. One primary reason behind this improvement is the generated compressive residual stress within the cured matrix, which impedes cracks initiation and propagation. However, the prestressing force might diminish progressively with time due to the creep of the compressed matrix and the relaxation of the tensioned fiber. As a result, the initial compressive residual stress and the acquired improvement in mechanical properties are prone to decline over time. Therefore, it is necessary to evaluate the mechanical properties of the prestressed composites as time proceeds. This study monitors the change in the tensile and flexural properties of unidirectional prestressed glass fiber reinforced epoxy composites over a period of 12 months after manufacturing. The composites were prepared using three different fiber volume fractions 25%, 30%, and 40%. The results of mechanical testing showed that the prestressed composites acquired an initial increase up to 29% in the tensile properties and up to 32% in the flexural properties compared to the non-prestressed counterparts. Throughout the 12 months of study, the initial increase in both tensile and flexural strength showed a progressive reduction. The loss ratio of the initial increase was observed to be inversely proportional to the fiber volume fraction. For the prestressed composites fabricated with 25%, 30%, and 40% fiber volume fraction, the initial increase in tensile and flexural strength dropped by 29%, 25%, and 17%, respectively and by 34%, 26%, and 21%, respectively at the end of the study. Approximately 50% of the total loss took place over the first month after the manufacture, while after the sixth month, the reduction in mechanical properties became insignificant. Tensile modulus started to show a very slight reduction after the fourth/sixth month, while the flexural modulus reduction was observed from the beginning. Although the prestressed composites displayed time-dependent losses, their long-term mechanical properties still outperformed the non-prestressed counterparts.

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