scholarly journals Investigation of Strength Parameters of PVA Fiber-Reinforced Fly Ash-Soil Mixtures in Large-Scale Direct Shear Apparatus

2018 ◽  
Vol 4 (11) ◽  
pp. 2618 ◽  
Author(s):  
Ashkan Gohari Lasaki ◽  
Reza Jamshidi Chenari ◽  
Javad Shamsi Sosahab ◽  
Yaser Jafarian
Keyword(s):  
Fly Ash ◽  
Polyvinyl Alcohol ◽  
Large Scale ◽  
Experimental Program ◽  
Direct Shear ◽  
Fiber Reinforced ◽  
Geotechnical Characteristics ◽  
Soil Mixtures ◽  
Direct Shear Apparatus ◽  
Pva Fiber

Soil reinforcement is an old and still efficient technique in improving soil strength and stiffness properties. Current paper aims at quantifying the effects of different inclusions on mechanical behavior of fiber-reinforced cemented soil. An experimental program was conducted to study simultaneous effects of randomly oriented fiber inclusions and cement stabilization on the geotechnical characteristics of fly ash-soil mixtures. Chamkhaleh sand, polyvinyl alcohol (PVA) fiber, cement and fly ash with some water were mixed and compacted into large scale direct shear apparatus with three equal layers. PVA fibers were randomly distributed in three compacted layers at predetermined weight contents. Direct shear tests were carried out on fly ash-soil specimens prepared with different cement, fly ash and polyvinyl alcohol contents, and 7 different curing periods. Results show that cement increases the strength of the raw fly ash-soil specimens. The fiber inclusion further increases the strength of the cemented and uncemented soil specimens and transforms their brittle behavior to ductile behavior. The fiber reinforcement and distribution throughout the entire specimen results in a significant increase in the strength of fly ash -soil- cement mixtures.

Behavior of High Performance PVA Fiber Reinforced Cement Composites under Uniaxial Compressive Load

2012 ◽  
Vol 174-177 ◽  
pp. 687-691 ◽  
Author(s):  
Yan Li ◽  
Ze Jun Liu
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Silica Fume ◽  
High Performance ◽  
Peak Stress ◽  
Fiber Content ◽  
Experimental Program ◽  
Fiber Reinforced ◽  
Reinforced Cement ◽  
Pva Fiber

Abstract. Based on an extensive experimental program, the paper studies the behavior of High Performance Fiber Reinforced Cement Composite (HPFRCC) under Uniaxial compression. The experimental parameters are: PVA fiber content by volume, fly ash and silica fume content. The compressive strength, peak strain as well as compressive stress-strain curves are obtained. The test results reveal that PVA fibers can greatly improve plastic deformation ability of HPFRCC, especially have significant impact on ductility after the peak stress, though fiber content has small influence on compressive strength. With the increase of fly ash content, peak stress of HPFRCC decreases, but toughness increases. 10% silica fume content has not obvious effect on compressive strength for HPFRCC with large quantities of fly ash , but leads to less ductile behavior.

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.

Mix design and flexural toughness of PVA fiber reinforced fly ash-geopolymer composites

2017 ◽  
Vol 150 ◽  
pp. 179-189 ◽  
Author(s):  
Fang Xu ◽  
Xin Deng ◽  
Chao Peng ◽  
Jing Zhu ◽  
Jianping Chen
Keyword(s):  
Fly Ash ◽  
Mix Design ◽  
Fiber Reinforced ◽  
Flexural Toughness ◽  
Pva Fiber ◽  
Geopolymer Composites

scholarly journals DIRECT SHEAR TEST ON FLY ASH- LIME SOIL MIXTURES

2020 ◽  
Vol 04 (11) ◽  
pp. 50-53
Author(s):  
Mahdi Keramatikerman ◽  
Amin Chegenizadeh ◽  
Hamid Nikraz
Keyword(s):  
Fly Ash ◽  
Direct Shear Test ◽  
Shear Test ◽  
Direct Shear ◽  
Soil Mixtures

scholarly journals Analysis of the suction evolution during direct shear test in a silty sand soil

2020 ◽  
Vol 195 ◽  
pp. 03031
Author(s):  
Omar AL-Emami ◽  
Gabriela M Medero ◽  
Fernando A M Marinho ◽  
Melis Sutman
Keyword(s):  
Shear Strength ◽  
Water Content ◽  
Large Scale ◽  
Matric Suction ◽  
Vertical Stress ◽  
Silty Sand ◽  
Experimental Program ◽  
Direct Shear ◽  
Initial Void Ratio ◽  
Study Results

Shear strength of soils is one of the essential parameters for analysing and solving divers geotechnical problems (e.g. the bearing capacity of shallow footings pile foundations, slope stability and earth embankments). In this study, a series of conventional large-scale (300 X 300 mm) direct shear tests were carried out on saturated and constant water content silty sand specimens at ei = 0.6 and 1.0 tested under applied vertical stresses of 100, 200, or 400 kPa to investigate the influence of matric suction on the shear strength characteristics of the tested material. A loading steel cap was modified to allow the direct measurements of the matric suction using two commercial available Equitensiometer suction probes (EQ3). The experimental program indicated that, for both studied void ratios, the obtained shear strength of specimens under constant water content is found to be distinctly greater than those obtained from saturated samples. The results showed that the samples compacted at ei = 1.0 exhibited collapse behaviour during saturation stage, whereas same samples did not show any volume change during stabilisation stage when tested under constant water content condition. The study results also showed that the matric suction reduction during consolidation stage depends on initial void ratio of the tested samples as well as the level of applied vertical stress. Moreover, the matric suction evolution during shearing process of both studied void ratios specimens decreased with increasing the level of applied vertical stress.

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