Steel fiber reinforced geopolymer matrix (S-FRGM) composites applied to reinforced concrete structures for strengthening applications: A preliminary study

Carabba, Lorenza; Santandrea, Mattia; Carloni, Christian; Manzi, Stefania; Bignozzi, Maria

doi:10.1016/j.compositesb.2017.07.007

Cited by 73 publications

(31 citation statements)

References 36 publications

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“…The great water loss of the cementitious mortar is related to the higher presence of water used for the mix design, for which a higher amount of free water evaporated during the test. However, the highest free drying shrinkage is registered for the geopolymeric mortar R3 GEO, which is 85% higher than the values of the other two mortars (Figure 6a), according to the literature [58][59][60]68], whereas the lowest one is shown by R3 CSA [53,69]. This effect is due to two aspects: on one hand, R3 GEO is characterized by the highest percentage of pores with small diameters (around 15 nm, see Figure 4); on the other hand, its dynamic modulus of elasticity is the lowest.…”

Section: Drying Shrinkage and Weight Lossmentioning

confidence: 71%

Calcium Sulfoaluminate, Geopolymeric, and Cementitious Mortars for Structural Applications

et al. 2017

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This paper deals with the study of calcium sulfoaluminate (CSA) and geopolymeric (GEO) binders as alternatives to ordinary Portland cement (OPC) for the production of more environmentally-friendly construction materials. For this reason, three types of mortar with the same mechanical strength class (R3 ≥ 25 MPa, according to EN 1504-3) were tested and compared; they were based on CSA cement, an alkaline activated coal fly ash, and OPC. Firstly, binder pastes were prepared and their hydration was studied by means of X-ray diffraction (XRD) and differential thermal-thermogravimetric (DT-TG) analyses. Afterwards, mortars were compared in terms of workability, dynamic modulus of elasticity, adhesion to red clay bricks, free and restrained drying shrinkage, water vapor permeability, capillary water absorption, and resistance to sulfate attack. DT-TG and XRD analyses evidenced the main reactive phases of the investigated binders involved in the hydration reactions. Moreover, the sulfoaluminate mortar showed the smallest free shrinkage and the highest restrained shrinkage, mainly due to its high dynamic modulus of elasticity. The pore size distribution of geopolymeric mortar was responsible for the lowest capillary water absorption at short times and for the highest permeability to water vapor and the greatest resistance to sulfate attack.

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Section: Drying Shrinkage and Weight Lossmentioning

confidence: 71%

Calcium Sulfoaluminate, Geopolymeric, and Cementitious Mortars for Structural Applications

et al. 2017

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“…where R f is strength reinforced ratio of SFRC; it can represent f fts /f ts , f fv /f v , or f ftm /f tm ; α c is the influence coefficient of concrete matrix, which is related to compressive strength of concrete matrix. α c can be obtained through the regression analysis of experiment data in this paper and previous literature [13,16,21,[32][33][34][35][36] based on equation (5). According to equation (4), α f is known: α f � 0.21 for ST-F; α f � 0.27 for HE-F; α f � 0.4 for CO-F. e relationship between R f and α f λ f is shown in Figure 9.…”

Section: Effect Of Concretementioning

confidence: 99%

“…Compared with other fibers, steel fiber has many advantages, such as high stiffness and elasticity modulus and tensile strength. Steel fiber reinforced concrete (SFRC) has excellent tensile and flexural property [5,6], which has been widely used as structural material. In order to improve the reinforced effect of steel fiber, the reinforced mechanism of steel fiber on concrete had been researched widely [7,8].…”

Section: Introductionmentioning

confidence: 99%

Effect of Surface Shape and Content of Steel Fiber on Mechanical Properties of Concrete

Zhang

Zhao

Fan

et al. 2020

Advances in Civil Engineering

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Steel fiber reinforced concrete (SFRC) has gained popularity in the last decades attributed to the improvement of brittleness and low tensile strength of concrete. This study investigates the effect of three shapes of steel fibers (straight, hooked end, and corrugated) with four contents (0.5%, 1%, 1.5%, and 2%) on the mechanical properties (compression, splitting tension, shear, and flexure) of concrete. Thirteen groups of concrete were prepared and investigated experimentally. Test results indicated that steel fiber had significant reinforcement on mechanical properties of concrete. When the steel fiber content increases from 0.5% to 2.0%, the compressive strengths increase about 4–24%, splitting tensile strengths increase about 33–122%, shear strengths increase about 31–79%, and flexural strengths increase about 25–111%. Corrugated steel fiber has the best reinforced effect on strength of SFRC, hooked end steel fiber takes the second place, and straight steel fiber is the least. Calculated formulas of compressive, splitting tensile, shear, and flexural strengths were established with consideration of the bonding properties between concrete and steel fiber. Influence factors of steel fiber αf and concrete matrix strength αc were put forward and determined by regression analysis of experimental data. Calculated results agree well with the experimental results.

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“…A few investigations have implemented such an approach to clarify the effects of adding different fibers on the mechanical characteristics of OAASs [16]. Although various studies have been conducted on different aspects of the fresh and hardened state properties of fiber reinforced alkali activated mortars (with liquid sodium silicate), such as: rheological properties (reinforced with polyvinyl alcohol (PVA) fibers) [20], bending properties (steel and Polypropylene (PP) [21], PP [22], steel [23][24][25], carbon [26]), durability properties (PP [22], refractory fibers [27]), and ultra-high performance fiber reinforced mortars (PVA [28], polyethylene [29,30], steel [31]). All of these investigations confirmed the positive influential impacts of fibers on alkali activated materials, which the effects of reinforcements majorly depend on the physical and mechanical properties of fiber, bond properties at interfacial transition zone (ITZ) between fiber/matrix, and binding properties and compactness of the matrix.…”

Section: Introductionmentioning

confidence: 99%

Durability of the Reinforced One-Part Alkali-Activated Slag Mortars with Different Fibers

Abdollahnejad

Mastali

Falah

et al. 2020

Waste Biomass Valor

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This paper investigates the effects of reinforcing one-part alkali-activated slag binders (OAASs) with different types of fiber (steel, polyvinyl alcohol [PVA], basalt, and cellulose) and fiber combinations (single and hybrid) on the mechanical and durability properties of OAASs. All OAASs were reinforced by a 1% fiber volume fraction. Compressive and flexural strengths were the mechanical properties, which were addressed. The durability of the reinforced OAASs was examined based on water absorption by immersion and capillary, acid resistance, high temperature resistance, carbonation resistance, and freeze/thaw resistance. The experimental results showed that the fiber type and combination greatly affects the mechanical and durability properties of OAASs. Moreover, the influence of fiber type and combination on high temperature resistance and freeze/thaw resistance is greater than the influence on acid resistance and carbonation resistance. Graphic AbstractKeywords One-part alkali activated binders · Fiber reinforced mortars · Mechanical and durability properties · Fiber type · Fiber combination * Z. Abdollahnejad

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Steel fiber reinforced geopolymer matrix (S-FRGM) composites applied to reinforced concrete structures for strengthening applications: A preliminary study

Cited by 73 publications

References 36 publications

Calcium Sulfoaluminate, Geopolymeric, and Cementitious Mortars for Structural Applications

Calcium Sulfoaluminate, Geopolymeric, and Cementitious Mortars for Structural Applications

Effect of Surface Shape and Content of Steel Fiber on Mechanical Properties of Concrete

Durability of the Reinforced One-Part Alkali-Activated Slag Mortars with Different Fibers

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