Mechanical properties of alkali activated blast furnace slag pastes reinforced with carbon fibers

Vilaplana, Josep Lluís; Baeza, F. Javier; Galao, Ó.; Alcocel, E. G.; Zornoza, E.; Garcés, P.

doi:10.1016/j.conbuildmat.2016.04.066

Cited by 77 publications

(28 citation statements)

References 37 publications

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“…In prior studies it was found that the drying and autogenous shrinkage of alkali-activated slag concrete (AASC) is more serious than that of OPC [17][18][19][20]62]. The shrinkage is mainly influenced by the type of alkali activator, curing condition and alkali concentration and can be alleviated to some extent by adding shrinkage-reducing admixtures [18,19] or fibers into the matrix [20][21][22]. Many studies have also revealed that the workability of AAC is sensitive to the composition and fineness of raw material, alkali concentration and modulus of alkali activator [35,[37][38][39].…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties of alkali-activated concrete: A state-of-the-art review

Ding

Dai

Shi

2016

Construction and Building Materials

330

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Alkali-activated concretes (AACs) are attracting increasing attention due to their potential as alternatives to ordinary Portland cement concrete (OPCC). This paper is a holistic review of current research on the mechanical properties of AAC including research on its compressive strength, tensile strength, elastic modulus, Poisson's ratio, stress-strain relationship under uniaxial compression, fracture properties, bond mechanism with steel reinforcement, dynamic mechanical properties, and high-temperature performance. Three types of AAC are reviewed: alkali-activated slag, alkali-activated fly ash, and alkali-activated slag-fly ash concretes. The applicability to AAC of design formulas found in codes of practice that were developed to estimate the basic mechanical performances of OPCC is also discussed. It is shown that, in general, AAC exhibits better bond performance with steel reinforcement and better strength performance after exposure to elevated temperatures than OPCC. For the other reviewed mechanical properties, the differences between AAC and OPCC largely depend on the proportions of raw materials in the concrete; specifically, the slag to fly ash ratio may be a very influential factor. As there is a trend to combine slag and fly ash in the production of AAC to achieve normal temperature curing and environmental friendliness, further research is deemed necessary to determine how the slag to fly ash ratio influences the fundamental mechanical properties of AAC and how this affects practical designs.

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Section: Introductionmentioning

confidence: 99%

Mechanical properties of alkali-activated concrete: A state-of-the-art review

Ding

Dai

Shi

2016

Construction and Building Materials

330

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“…On the other hand, the firing shrinkage decreases with increasing content of the modified kapok carbon fiber at same sintering temperature. This is due to the enhanced formation of clusters in the mixing stage when higher amounts of modified carbon fiber are used (Vilaplana et al, 2016). The decreasing content of mineral clays in the mixtures of raw materials results in decreasing plasticity of these mixtures, which leads to less contact between the clay particles (Bories et al, 2015).…”

Section: The Physical Properties Of Wetted Materials and Sintered Promentioning

confidence: 99%

Water Filter Fabrication from a Mixture of KMnO<sub>4</sub> Modified Kapok Carbon Fiber, Zeolite, Bentonite and Clay for Fe<sup>3+</sup>Removal and Water Hardness Treatment

Thongdee¹,

Parun²,

Benjatitmongkhon³

et al. 2017

American Journal of Applied Sciences

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A water filter was fabricated from a mixture of KMnO 4 modified kapok carbon fiber, zeolite, bentonite and kaolinite clay for Fe 3+ removal and water hardness treatment. The effects of amount of KMnO 4 modified kapok carbon fiber (30-60 wt%), zeolite (20-40 wt%) and sintering temperature (500-700°C) on the properties of sintered products were evaluated. The best of sintered products were tested for treatment of solutions with 5 mg L −1 Fe 3+ and 40-200 mg L −1 total water hardness. The results show that the physical properties of the sintered products were affected by the contents of KMnO 4 modified kapok carbon fiber and sintering temperature. The linear drying shrinkages of the mixture of raw materials increase with increasing content of modified kapok carbon fiber amounts due to the effect of water amount used for mixing process. Furthermore, firing shrinkages of sintered products increased with increasing sintering temperature for the same ratio of raw materials. Finally, the firing shrinkages and density of sintered products decrease with increasing content of the modified kapok carbon fiber at constant sintering temperature. It was shown that the sintered product made with 40 wt% of KMnO 4 modified kapok carbon fiber and sintered at 600°C is suitable for filter fabrication. The KMnO 4 modified kapok carbon fiber filter could adsorb 5-6% more Fe 3+ at equilibrium than filter made with kapok carbon fiber. The Fe 3+ was removed by adsorption and precipitation processes. The Fe 3+ adsorption process of modified kapok carbon fiber filter was fitted to the Langmuir model with maximum adsorption capacity of 53.76 mg g −1 . For hardness removal, the Ca for Mg 2+ and 28.1-123.5 mg g −1 for HCO 3¯, respectively.

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“…e results showed that the mechanical performance of AASS mortars was significantly better than OPC control mortar, and the drying shrinkage of AASS mortars decreased with the increasing fiber dosage. Vilaplana et al [48] concluded that carbon fibers (CF) can be a convenient addition to control the drying shrinkage of AAS composites. Puertas et al [49] found that alkali-resistant glass fiber can significantly reduce the drying shrinkage of AAS mortars (over 20%).…”

Section: Introductionmentioning

confidence: 99%

“…Polypropylene fiber (PPF) is the most common synthetic fiber and widely used as a reinforcing material for ordinary Portland cement-based materials due to its high toughness and durability. Most studies have only been carried out focusing on the effect of different types of fibers on drying shrinkage of AAS mortar, and little attention has been paid to the effect of PPF on shrinkage of AAS mortar [47][48][49]. erefore, the effects of PPF content (volume fraction from 0 to 0.2%) on the physical, mechanical, shrinkage, impact resistance, and microstructure of AAS mortar were studied in this paper.…”

Section: Introductionmentioning

confidence: 99%

Effect of Polypropylene Fiber on Properties of Alkali‐Activated Slag Mortar

Chen

Wang

2020

Advances in Civil Engineering

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Alkali-activated slag (AAS) is becoming an increasingly popular building material due to its excellent engineering properties and low CO 2 emissions, but its large shrinkage is an important reason to restrict its application and popularization. is work is aimed to study the possibility of inhibiting the shrinkage of AAS mortar by incorporating polypropylene fiber (PPF). For this, an experimental study was carried out to evaluate the effects of PPF content on setting time, fluidity, physical properties, mechanical properties, impact resistance, and microstructure of AAS mortar. e volume content of PPF is 0.05%, 0.1%, 0.15%, and 0.2%. e working, physical (porosity, water absorption, and bulk density), mechanical, shrinkage, and impact resistance properties of the AAS mortars were evaluated. e results show that incorporating PPF effectively reduces the shrinkage deformation of AAS mortar, significantly improves its impact resistance, enhances its toughness, and slightly improves its compressive strength in the later stage. At the same time, PPF delays the initial setting time of AAS mortar and reduces the fluidity, density, porosity, and water absorption of AAS mortar. SEM results show that the bridging effect of PPF between AAS mortars can inhibit the generation and propagation of cracks, improve the internal microstructure, and enhance the performance of AAS mortar.

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Mechanical properties of alkali activated blast furnace slag pastes reinforced with carbon fibers

Cited by 77 publications

References 37 publications

Mechanical properties of alkali-activated concrete: A state-of-the-art review

Mechanical properties of alkali-activated concrete: A state-of-the-art review

Water Filter Fabrication from a Mixture of KMnO<sub>4</sub> Modified Kapok Carbon Fiber, Zeolite, Bentonite and Clay for Fe<sup>3+</sup>Removal and Water Hardness Treatment

Effect of Polypropylene Fiber on Properties of Alkali‐Activated Slag Mortar

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