The influence of expansive agent on the performance of fibre reinforced cement-based composites

Corinaldesi, Valeria; Nardinocchi, Alessandro; Donnini, Jacopo

doi:10.1016/j.conbuildmat.2015.05.002

Cited by 91 publications

(25 citation statements)

References 28 publications

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“…The accepted means to minimize the shrinkage of UHPC by employing internal curing carrier materials [15,16,17,18,19], expansive agents [20,21], shrinkage reducing agents [18,22,23], and other methods [24,25,26], can restrict the constriction development, especially its early self-shrinkage. However, the reduction of shrinkage by using an expansive agent alone is not recommendable due to its challenge in controlling the amount of swelling and occurrence time.…”

Section: Introductionmentioning

confidence: 99%

Effects of Pumice-Based Porous Material on Hydration Characteristics and Persistent Shrinkage of Ultra-High Performance Concrete (UHPC)

Liu

Shui

et al. 2018

Materials

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In this paper, two kinds of pumice particles with different diameters and water absorption rates are employed to substitute the corresponding size of river sands by volume fraction, and their effects on the hydration characteristics and persistent shrinkage of Ultra-High Performance Concrete (UHPC) are investigated. The obtained experimental results show that adopting a low dosage of 0.6–1.25 mm saturated pumice as the internal curing agent in UHPC can effectively retract the persistent shrinkage deformation of concrete without a decrease of strength. Heat flow calorimetry results demonstrate that the additional water has a retarding effect and promotes the hydration process. X-ray Diffraction (XRD) and Differential Thermal Gravimetry (DTG) are utilized to quantify the Ca(OH)2 content in the hardened paste, which can confirm that the external moisture could accelerate the early cement hydration and secondary hydration of active mineral admixtures. The Ca/Si ratio of C–S–H calculated by the Energy Dispersive Spectrometer (EDS) reveals that the incorporation of wet pumice can transform the composition and structure of hydration products in its effective area.

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Section: Introductionmentioning

confidence: 99%

Effects of Pumice-Based Porous Material on Hydration Characteristics and Persistent Shrinkage of Ultra-High Performance Concrete (UHPC)

Liu

Shui

et al. 2018

Materials

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“…The elastic modulus is about 218 GPa and tensile strength is about 320 MPa. Their effectiveness on reinforcing cement-based matrix was proven in previous experimental works [12,13] [14,15].…”

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confidence: 78%

Feasibility Study of a Table Prototype Made of High-Performance Fiber-Reinforced Concrete

et al. 2017

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The challenging and innovative idea of realizing a table totally made of fiber-reinforced concrete is explored through an interdisciplinary research activity, where contributions coming from different fields (design, material science, experimental testing, numerical modeling) are combined. The paper describes the different phases of the study, starting from the design of the table, moving through the development of a purpose-made high-performance fiber-reinforced concrete and the mechanical characterization via experimental testing, and concluding with numerical modeling. Numerical results are determined by implementing a damage plasticity constitutive model in a finite element code. The mechanical response of the table has been analyzed for different loading and boundary conditions, and an exhaustive and complete picture of the possible failure mechanisms has been drawn. Simulations have clearly described the different stress-softening processes of damage evolution and plastic strains localization, pointing out the vulnerable parts of the table. Finally, strategies for improving the table mechanical performances are discussed.Technologies 2017, 5, 41 2 of 13 structural elements (beams, plates, etc.) or prefabricated components. Only recently, attention has been paid to their use in three-dimensional printing techniques of real buildings [8].In the present work, application of fiber-reinforced concretes to the field of design is explored. At present, just a few design objects made of concrete have been proposed (for instance, see [9]), where concrete is never used as structural material. Here we propose the study of a table totally made of FRC, which has been designed by Metrica srl, a design studio in Milan, Italy. The designers felt the need to design an object that could provide the same design answers of the structures conceived by the great engineer. "Lightness" is the word that describes the achievements in the field of structural engineer that ranged from functionalist expressions to more organic and freeform/nature-based shapes. In the world of domestic and contract furniture, results are often pointing toward the opposite direction. Moreover, weight is another key-factor to take into consideration. The table has been called "Nervi table", in tribute of Pier Luigi Nervi, engineer and architect worldwide known for his innovative use of reinforced concrete. Renderings of the table are proposed in Figure 1. As can be seen, because of its thin and slender form, the Nervi table represents an interesting structural challenge, achieved only by combining efforts from different research fields.

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“…Figure 3 shows that shrinkage-compensated SHCC with EXA has greater flexural strength and less ductility compared to conventional SHCC due to the improvement of the interfacial adhesion that is caused by the formation of crystalline ettringite at the interface between fibers and surrounding cement matrix [24]. Corinaldesi et al [25] also reported the effectiveness of CaO-based EXA on the improvement of flexural strength. Figure 4 presents the averaged direct tensile stress versus strain relationships and cracking procedures at the initial stage (designated as '(1)' throughout the figure) and the tensile strength (designated as '(2)') of representative dumbbell-shaped specimen for the SHCC30 and SC-SHCC30 mixtures.…”

Section: Shrinkage History Of Shccmentioning

confidence: 99%

The Effect of Shrinkage-Compensation on the Performance of Strain-Hardening Cement Composite (SHCC)

Jang¹,

Kim

Park

et al. 2019

Sustainability

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This study investigated the effects of shrinkage compensation on the tensile and cracking responses of strain-hardening cement composite (SHCC) by adding calcium sulfoaluminate (CSA)-based expansive additive (EXA) to the mixture. Such responses are closely related to the durability of concrete structures, of dumbbell-shaped SHCC specimens, and reinforced SHCC ties. For this study, two SHCC mixtures and a conventional concrete mixture with a specific compressive strength value of 30 MPa were prepared and measured in terms of shrinkage history, compressive strength, flexural strength, and direct tensile strength. The test results show that the mechanical properties of shrinkage-compensated SHCC with 10% CSA-based EXA are superior to those of conventional SHCC and concrete mixtures. Also, reinforced tension ties with shrinkage-compensated SHCC exhibited the best multiple cracking and tension-stiffening behavior among the three types of tension ties tested. The results show that shrinkage compensation using CSA-based EXA in SHCC with rich mixture is effective for resisting crack damage. Shrinkage-compensated SHCC may be used for civil infrastructure facilities that require high levels of durability and are exposed to extreme environments.

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The influence of expansive agent on the performance of fibre reinforced cement-based composites

Cited by 91 publications

References 28 publications

Effects of Pumice-Based Porous Material on Hydration Characteristics and Persistent Shrinkage of Ultra-High Performance Concrete (UHPC)

Effects of Pumice-Based Porous Material on Hydration Characteristics and Persistent Shrinkage of Ultra-High Performance Concrete (UHPC)

Feasibility Study of a Table Prototype Made of High-Performance Fiber-Reinforced Concrete

The Effect of Shrinkage-Compensation on the Performance of Strain-Hardening Cement Composite (SHCC)

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