Experimental Research on the Performance of Polypropylene Fiber Foamed Ultra-lightweight Composites

Huynh, Trong‐Phuoc; Pham, Van-Hien; Lam, Tri-Khang; Ho, Nguyen-Trong

doi:10.13189/cea.2020.080429

Cited by 8 publications

(10 citation statements)

References 11 publications

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“…In addition, some State Departments of Transportation, such as Virginia Departments of Transportation (VDOT) [34], have provided special provisions for bridge decks made with lightweight concrete where no minimum density for concrete is specified. Table 3 shows the toughness indices for SULWECC specimens having load-deflection response illustrated in Figure (7). It can be seen that the toughness indices are higher than those assigned for perfectly elastic-plastic materials.…”

Section: Resultsmentioning

confidence: 95%

“…Figure (7) shows load-deflection curves for three experimentally tested non-reinforced and CFRP mesh reinforced SULWECC specimens obtained from third-point loading flexural test. The reinforcement ratio (ρ f ) was around 0.0011 [24].…”

Section: Calculationsmentioning

confidence: 99%

“…All these factors combined will result in cost saving opportunities. Ultra-lightweight ECC (ULWECC) has a very low thermal conductivity (less than 0.17 W/(m·K)) which makes it an excellent thermal insulation material [6,7].…”

Section: Introductionmentioning

confidence: 99%

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Flexural Resistance Factors for Structural Ultra Lightweight Engineered Cementitious Composite Slabs

Behnam¹,

Al-Iessa²

2021

cea

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Many problems associated with the use of normal weight concrete have been solved with the development of structural ultra-lightweight engineered cementitious composite (SULWECC) that has the capability to exhibit strain-hardening behavior prior to failure. However, the feasibility and standards that address the design of such engineered cementitious composites (ECC) in flexural slab systems are not available. In this study, reliability analysis and calibration process are carried out on three different SULWECC slab systems with the intention of estimating the potential flexural resistance factors. Although the high volume of randomly dispersed synthetic short fiber is considered the main reinforcement, SULWECC slab systems internally reinforced with carbon FRP mesh are also considered. The reinforcement ratio is selected so that the section is under-reinforced. Relevant load and resistance random variables are used, and appropriate statistical parameters are selected. The target reliability indices are chosen to be consistent with those used to develop current design code specifications. The nominal moment capacity is calculated based on a new model that consists of: elastic linear stress distribution in the compression zone and elastic-perfectly-plastic uniform stress distribution in the tension zone. The determined flexural resistance factors ranged from 0.59 to 0.69, although higher values are justifiable in special circumstances. The average slab thickness needed to satisfy the strength requirements ranged from 1/37 to 1/22 times the slab length. Flexural toughness to measure ductility is evaluated using load-deflection curves of experimentally tested SULWECC specimens.

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Section: Resultsmentioning

confidence: 95%

Section: Calculationsmentioning

confidence: 99%

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Flexural Resistance Factors for Structural Ultra Lightweight Engineered Cementitious Composite Slabs

Behnam¹,

Al-Iessa²

2021

cea

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“…However, it was discovered that the micro bumps (a cement hydration product) on the surface of the PPF created an irregular fiber surface and created a physical interlocking effect between the interfaces, thus increasing the interface strength between the PPF and matrix. From this vantage point, adding PPF improves the strength properties of concrete [30][31].…”

Section: Microstructure Of Cfrhpcmentioning

confidence: 99%

Behaviour of Fly ash and Metakaolin Based Composite Fiber (Glass and Polypropylene) Reinforced High Performance Concrete under Acid Attack

Patil¹,

Somasekharaiah²,

Rao³

et al. 2021

cea

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Improvements in concrete properties have been achieved by researchers with the invention of High-Performance-Concrete (HPC), which can now be improvised by using a combination of mineral admixtures. HPC is usually more brittle which can be made ductile by modifying its composition by adding fibers in the design mix, which led to the development of fiber-reinforced concrete. High-Performance-Concrete made with glass fibers and polypropylene fibers is regarded as Composite Fibre (Glass and polypropylene) Reinforced High Performance Concrete (CFRHPC). The development of cost-effective state-of-the-art procedures for producing, evaluating, and designing with CFRHPC will enhance the performance for each performance characteristic and can be reliably achieved in the field. This investigation evaluates the effect of cement being partially replaced by combined fly ash and metakaolin with glass fibers and polypropylene fibers as an addition to produce high-performance concrete with composite fiber for resistance to hydrochloric acid, magnesium sulphate, and sulphuric acid attack for 30, 60, and 90 days. The water to binder ratios (W/B) of 0.275, 0.300, 0.325, and 0.350 and an aggregate to binder ratio (A/B) of 1.75 were adopted. Fly ash and metakaolin were replaced in the range from 0% to 15% each, glass fibers were added in volume percentages from 0% to 1%, and polypropylene fibers were kept constant at 0.25%. The combined effect of fly ash and metakaolin at 5% each as replacement of cement and the addition of composite fiber dosage of glass fiber=1% and polypropylene fibers=0.25% for W/B of 0.275 was found to be the optimum combination to obtain maximum acid attack resistance, which was also justified by SEM, EDX, and XRD analysis done in this investigation. CFRHPC production minimizes enormous cement production and safeguards the environment from pollution and concrete from environmental pollution throughout its service life.

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“…Twelve simply supported composite steel truss bridges between spans of 21m to 63 m were constructed in the Czech Republic in the last decade [2]. Apart from load sharing, composite decks also increase lateral stiffness of the structure, which renders these suitable for a number of different types of bridge systems including cable stayed bridges [3] Introduction of light weight concrete [4] and fiber reinforced composite [5] into deck slab construction can further yield to weight reduction of deck and more economical design of bridges.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Non-composite and Composite Deck Bridges

Sharma¹,

Pathak²,

Singh³

2021

cea

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Use of composite RCC deck over steel bridges has now significantly increased. The detailed experimental study was conducted to ascertain improvements due to composite RCC deck over non-composite bridge model. Deck type steel bridge models, with and without composite decks were tested in laboratory up to failure. The failure in non-composite model was observed due to buckling of top chord member at a stress of 234.6 N/mm 2 , whereas for the model with composite deck it changed to rupture of the bottom chord in tension at a stress of 614.8 N/mm 2 . Failure load and stiffness of the structure also increased significantly due to the composite action. Shear connectors designed as per IRC 22:2008 transferred the shear effectively and deck slab also participated in load sharing. Further, load sharing in the top chord compression member comprising the steel top chord, the concrete in the deck slab, and the reinforcing steel in it, was also explored. It is found that 72.0% of the composite top chord compressive force is taken by the RCC deck, and in the RCC deck 30.7% force is taken by the reinforcement. Strain variation in deck slab was also recorded using strain gauges. Strain in deck slab over top chord members was observed to be 54% more than the strain in the middle of the deck slab.

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Experimental Research on the Performance of Polypropylene Fiber Foamed Ultra-lightweight Composites

Cited by 8 publications

References 11 publications

Flexural Resistance Factors for Structural Ultra Lightweight Engineered Cementitious Composite Slabs

Flexural Resistance Factors for Structural Ultra Lightweight Engineered Cementitious Composite Slabs

Behaviour of Fly ash and Metakaolin Based Composite Fiber (Glass and Polypropylene) Reinforced High Performance Concrete under Acid Attack

Experimental Investigation of Non-composite and Composite Deck Bridges

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