Testing the Strength of Concrete Made From Raw and Dispersion-Treated Concrete Recyclate by Addition of Additives and Admixtures

Stehlík, Michal

doi:10.3846/13923730.2012.734853

Cited by 6 publications

(4 citation statements)

References 6 publications

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“…Nowadays, different types of waste are used as additives to concrete in order to improve its durability, strength and fracture toughness (Meyer 2009;Jóźwiak-Niedźwiedzka et al 2012;Stehlík 2013;Konkol, Prokopski 2014;Grinys et al 2013Grinys et al , 2015. One of these materials is siliceous fly ash (FA) which is a by-product obtained in the process of hard coal combustion performed in electric power stations and in thermal-electric power stations (Ahmaruzzaman 2010).…”

Section: Introduction and Literature Reviewmentioning

confidence: 99%

Effect of fly ash addition on the fracture toughness of plain concrete at third model of fracture

Golewski

2017

Journal of Civil Engineering and Management

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A new testing method and estimation of the fracture toughness in Mode III (antiplane shear) of concretes containing: 0, 20 and 30% volume content of the class F fly ash (FA) was proposed. Fracture toughness tests were performed on axial torsional machine MTS 809 Axial/Torsional Test System using special device. The Device for the fracture toughness test at the Mode III fracture consisted of the cylindrical specimen with the formed initial crack, steel plates, and screws with washers securing the specimen in the press holders. The specimens applied for experiments were cylinders with dimensions of 150/300 mm, having an initial circumferential notch made in the half-height of cylinders. The specimens were subjected to pure torsion. The studies examined effect of FA additive on the parameter K IIIc . 20% FA additive causes a small increase of the K IIIc in comparison to the concrete without the FA, while 30% FA additive causes a significant decrease in fracture toughness. The fracture surfaces of the specimens analysed macroscopically were planar. Scanning microscopic observations (SEM) indicate that in the fracture surfaces multilevel cracks occur in the shape of semicircles.

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Section: Introduction and Literature Reviewmentioning

confidence: 99%

Effect of fly ash addition on the fracture toughness of plain concrete at third model of fracture

Golewski

2017

Journal of Civil Engineering and Management

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“…Grabiec (2013) studied the rheological properties of self-compacting concrete mixes containing a viscosity agent (VMA) in their composition. Stehlík (2013) examined the literatures published in the field of application of recycled materials in the building industry to contribute to the enhancement of the existing findings with new experience in using waste admixtures.…”

Section: Introductionmentioning

confidence: 99%

Influence of Composite Elastic Modulus and Lateral Load Pattern on Deflection of Anti-Slide Pile Head

Liu

et al. 2015

Journal of Civil Engineering and Management

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This paper develops a new method to directly determine the composite elastic modulus of the reinforced concrete cantilever pile rather than adopt theoretical or empirical approaches. On the basis of the theory of material mechanism, the load-deflection equation was deduced to create the relationship between the elastic modulus and the ratio of load-deflection. The numerical modelling tests based on ANSYS separation modelling technology were carried out to determine the composite elastic modulus under different reinforcement ratio, concrete strength grade and distribution pattern of driving force. The results can be used to create the quantitative relationship between the composite elastic modulus and reinforcement ratio as well as concrete strength grade. Comparison amongst various lateral load pattern were made to show that the deflection of pile head is obviously affected by the lateral load pattern, and the corresponding equations of the deflection of the pile head under different lateral load pattern were proposed, which can reflect the ranking of the great influence on the deflection of the pile head, rectangular, trapezoidal and triangular lateral load pattern in order.

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“…Today, the recovery of such wastes is an economical alternative feasible in different applications, but they must satisfy the same requirements in terms of quality and performance than traditional materials. Although extensive research has been done on recycled concrete materials over the last decades [3][4][5][6], there have been very few studies concerning the formulation of mortars or concretes which incorporates waste fiber-cement. Recently, Müller et al [1] conducted a study on the use of crushed asbestos-free fiber-cement waste as aggregate base layer for road structures.…”

Section: Introductionmentioning

confidence: 99%

Use of asbestos-free fiber-cement waste as a partial substitute of Portland cement in mortar

2014

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International audienceThis work aims to study the possibility to use asbestos-free fiber-cement waste in substitution of ordinary Portland cement for the production of mortars. The fiber-cement particles were incorporated in mortars in partial replacement of cement, with mass substitution rates of 5 and 20 %. Cement hydration rate, workability, total shrinkage, porosity accessible to water and mechanical performances of mortars made with ground fiber-cement were measured and compared with the properties of control paste and mortar (free of fiber-cement). The results showed that the presence of fiber-cement extended by 5–10 % the dormant period of the binder hydration, when compared to that of Portland cement, depending on the substitution rate considered. Furthermore, at 28 days, the replacement of cement with 5 and 20 % of fibercement caused a reduction of 14–35 % in compressive strength, when compared to the reference mortar performances. This decrease was greater than that observed on mortars containing limestone filler with the same substitution rate of cement. However, the strengths obtained were acceptable for structural applications

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Testing the Strength of Concrete Made From Raw and Dispersion-Treated Concrete Recyclate by Addition of Additives and Admixtures

Cited by 6 publications

References 6 publications

Effect of fly ash addition on the fracture toughness of plain concrete at third model of fracture

Effect of fly ash addition on the fracture toughness of plain concrete at third model of fracture

Influence of Composite Elastic Modulus and Lateral Load Pattern on Deflection of Anti-Slide Pile Head

Use of asbestos-free fiber-cement waste as a partial substitute of Portland cement in mortar

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