Fire Resistance of Concrete Using High Strength Artificial Lightweight Aggregate Made of Fly Ash

Ishikawa, Yoshitaka; Hayakawa, Mitsutaka; Yasuda, Masayuki; Katou, Masahiro

doi:10.3130/aijs.70.1_9

Cited by 1 publication

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“…This applies to all tested types of tensile strength: direct, splitting, and bending. Nevertheless, many studies on the tensile strength tests of structural lightweight concretes indicate a similar relationship between the tensile and compressive strengths as for normal-weight concrete, e.g., [5,[7][8][9][10]. As Young's modulus of concrete, which is a two-component composite, depends considerably on the modulus of elasticity of aggregate, LWAC is characterized by a much lower modulus of elasticity, which was confirmed in numerous studies [6,[11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Assessment of Properties of Structural Lightweight Concrete with Sintered Fly Ash Aggregate in Terms of Its Suitability for Use in Prestressed Members

2023

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The main aim of the paper was to assess whether the lightweight concrete with a new type of sintered fly ash aggregate can be used as a structural material for post-tensioned elements subject to high effort. This purpose was achieved by comparison of the properties of lightweight aggregate concrete with Certyd aggregate (LWAC) and normal-weight concrete with dolomite aggregate (NWAC) of similar strength in terms of their suitability for use in prestressed members. Special emphasis was placed on long-term, relatively rarely performed tests of rheological properties such as shrinkage and creep. The research was conducted on standard specimens as well as on plain and post-tensioned beams of bigger scale, which could reflect better the behavior of the materials in a destined type of structural members. The carried out tests showed that, despite the expected lower density and modulus of elasticity, LWAC revealed comparable tensile strength and lower shrinkage and creep in the whole time of observations (ca 1.5 years) in comparison to NWAC. Moreover, the total loss of prestressing force for beams made of LWAC was slightly lower than for NWAC. Estimations of tensile strength and modulus of elasticity values according to the standard Eurocode EN-1992-1-1 for both concrete types turned out to be satisfactory. However, the rheological properties of the tested lightweight concrete seemed to be considerably overestimated.

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