Lightweight Aggregate Concrete as an Alternative for Dense Concrete in Post-Tensioned Concrete Slab

Mieszczak, Małgorzata; Domagała, Lucyna

doi:10.4028/www.scientific.net/msf.926.140

Cited by 5 publications

(4 citation statements)

References 11 publications

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“…The entire research process is expected to run for more than 300 days after the samples were made. The results obtained do not differ significantly from the results presented in the papers [4,5].…”

Section: Discussionsupporting

confidence: 48%

Mechanical properties of lightweight concrete with sintered aggregate

Rogowska

Lewiński

2020

MATEC Web Conf.

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The objective of this paper is the determination of short-term properties of lightweight concrete with sintered aggregate. The aggregate material comes from the recycling of ashes from power plants, which yield granules after processing. The research was planned based on two concrete mixes. A series of tests was carried out in the ITB Laboratory of Building Structures, Geotechnics and Concrete. As a result of these tests, the following parameters were determined: secant modulus of elasticity and cylinder strength of concrete, cube strength of concrete, axial tensile strength, splitting tensile strength, flexural strength and concrete shrinkage. Knowledge of the tested parameters is necessary when designing prestressed structures, as well as accepting proven values for static calculations when designing complex engineering structures, including prestressed elements made of lightweight concrete.

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Section: Discussionsupporting

confidence: 48%

Mechanical properties of lightweight concrete with sintered aggregate

Rogowska

Lewiński

2020

MATEC Web Conf.

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“…The basic properties of the used lightweight aggregate fraction, presented in Figure 1, were the following: the crushing resistance, tested according to EN 13055-1 [29], 8.0 MPa; the particle density, specified in accordance with EN 1097-6 [30], 1320 kg/m 3 ; the bulk density tested in accordance to EN 1097-6 [31], 730 kg/m 3 ; the water absorption, determined according to EN 1097-6 [30] after immersion in water for 24 and 72 h reached 18.8 and 25.3%, respectively. Analyzing the above properties of the lightweight aggregate and comparing them to properties of other lightweight aggregates [2,[32][33][34][35][36], it should be stated that despite rather high-water absorption, it reveals relatively high crushing resistance which made this LWA one of the most suitable for structural concretes. The main aim of the research was to check the influence of lightweight concrete moisture content on specified values of modulus of elasticity determined as dynamic one in non-destructive ultrasonic pulse velocity method as well as static secant one determined in cycles of compressive loading and unloading.…”

Section: Methodsmentioning

confidence: 99%

Effect of Moisture Condition of Structural Lightweight Concretes on Specified Values of Static and Dynamic Modulus of Elasticity

Domagała,

Sieja

2023

Materials

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The dynamic modulus of elasticity (Ed), specified by ultrasonic pulse velocity measurements, is often used, especially for concrete built into construction, to estimate the static modulus of elasticity (Ec,s). However, the most commonly used Equations for such estimations do not take into account the influence of concrete moisture. The aim of this paper was to establish this influence for two series of structural lightweight aggregate concrete (LWAC) varying in their strength (40.2 and 54.3 MPa) and density (1690 and 1780 kg/m3). The effect of LWAC moisture content turned out to be much more pronounced in the case of dynamic modulus measurements than for static ones. The achieved results indicate that the moisture content of the concrete should be taken into consideration in modulus measurements as well as in Equations estimating Ec,s on the basis of Ed specified by the ultrasonic pulse velocity method. The static modulus of LWACs was lower on average by 11 and 24% in relation to dynamic modulus, respectively when measured in air-dried and water-saturated conditions. The influence of LWAC moisture content on the relationship between specified static and dynamic moduli was not affected by the type of tested lightweight concrete.

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“…The concept of using lightweight concrete for prestressed structures may turn out to be a very good alternative to normal-weight concrete. Due to the application of LWAC instead of NWAC, the amount of concrete and prestressing steel can be reduced [27]. Mayer and Khan [28] showed that the use of high-strength lightweight concrete allowed the design of load-bearing structures with a larger span.…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, in the available literature, there are not so many examples of research carried out on prestressed structural members due to the large size of such elements as well as complicated, long-term, and more expensive performance. The research dedicated to the application of structural lightweight concrete for the prestressed members is even rarer [26][27][28][29].…”

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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Lightweight Aggregate Concrete as an Alternative for Dense Concrete in Post-Tensioned Concrete Slab

Cited by 5 publications

References 11 publications

Mechanical properties of lightweight concrete with sintered aggregate

Mechanical properties of lightweight concrete with sintered aggregate

Effect of Moisture Condition of Structural Lightweight Concretes on Specified Values of Static and Dynamic Modulus of Elasticity

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

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