Types of lightweight aggregate and their effect on the properties of fine-aggregate structural-insulating concrete

Domagała, Lucyna

doi:10.32047/cwb.2019.24.4.5

Cited by 2 publications

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“…Such an observation may be explained by the different microstructure of LWACs with aggregates of different initial moisture content. As it was proved in [ 9 , 27 ], the less initial moisture content of LWA, the better adhesion between cement paste and the aggregate and the more linear stress–strain relationship.…”

Section: Introductionmentioning

confidence: 93%

“…This is particularly important due to the fact that in the case of structural lightweight concretes, the content of lightweight aggregate is a parameter through which the modeling of the properties of concrete composites is deliberately influenced. As a result, the estimated value of modulus of elasticity for LWAC may be lower by 15 up to 60% in comparison to NWAC of comparable strength class [ 1 , 7 , 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

“…In particular, this applies to the cases of determining the modulus on specimens taken from a structure or non-destructive testing using the ultrasonic method. Meanwhile, as opposed to compressive strength, when the moisture content of concrete exceeds a certain level in relation to its saturation condition, the modulus of elasticity increases [ 2 , 9 , 13 ]. As a result, depending on the composition of concrete and its porosity structure, static modulus of elasticity tested in water-saturated conditions was observed as higher by 3 up to 55% in relation to dry conditions [ 9 , 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

“…Meanwhile, as opposed to compressive strength, when the moisture content of concrete exceeds a certain level in relation to its saturation condition, the modulus of elasticity increases [ 2 , 9 , 13 ]. As a result, depending on the composition of concrete and its porosity structure, static modulus of elasticity tested in water-saturated conditions was observed as higher by 3 up to 55% in relation to dry conditions [ 9 , 14 , 15 ]. The increase is explained by the lower deformability of the material in which the pores are filled with water.…”

Section: Introductionmentioning

confidence: 99%

“…Unfortunately, there is only a few research studies dealing with this problem. In [ 9 ], it was shown that for structural lightweight concrete the modulus determined in water-saturated conditions was higher by up to 14% than this specified in air-dry conditions (the degree of saturation ranged from 60 and 100%). The increase in modulus was more pronounced in the case of LWAC with higher water absorption.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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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Fire-Temperature Influence on Portland and Calcium Sulfoaluminate Blend Composites

2020

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This paper presents the research data of the fire-temperature influence on Portland CEM I (OPC) and calcium sulfoaluminate (CSA) types of cement blend composites as cooling materials dedicated for infill and covers in fire systems. The data present the material responses for four types at high-temperature elevation times (0, 15, 30, 60 min), such as core heat curves, differences in specimens color, flexural and compressive strength parameters. Materials were tested using the DSC method to collect information about enthalpies. The differences between cement blend composites were compared with commonly used cooling materials such as gypsum blends. It is shown that modifications to Portland cement composites by calcium sulfoaluminate cement have a significant influence on the cooling performance during high-temperature, even for 60 min of exposure. The temperature increase rates in the material core were slower in composites with regards to additionally containing calcium sulfoaluminate in 100–150 °C range. After 60 min of high-temperature elevation, the highest flexural and compressive strength was 75% OPC/25% CSA cement composition. The influence on cooling properties was not related to strength properties. The presented solution may have a significant influence as a passive extinguisher solution of future fire resistance systems in civil engineering.

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Types of lightweight aggregate and their effect on the properties of fine-aggregate structural-insulating concrete

Cited by 2 publications

References 0 publications

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

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

Fire-Temperature Influence on Portland and Calcium Sulfoaluminate Blend Composites

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