Thermal conductivity of soil-based aerated lightweight concrete

Low, Kaw-Sai; Ng, Soon-Ching; Tioh, N. H.

doi:10.1007/s12205-014-0022-4

Cited by 9 publications

(4 citation statements)

References 18 publications

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“…As the moisture content increases, the specific heat capacity also increases. Low et al [31] propose the relationship between the concrete specific heat capacity and moisture content.…”

Section: Specific Heat Capacitymentioning

confidence: 99%

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Coupled Analysis of Thermofluid-Structure Field for Thermal Properties of Early-Age Concrete Influenced by Electric Heating System

et al. 2022

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When heat energy is transferred to concrete through energy conversion by an electric heating system, the overall thermal performance of the early-age concrete is affected by the local high temperature of the concrete. This, in turn, affects the accuracy of the prediction and calculation of concrete deformation. Concrete thermal physical parameter models considering the mutual influence of heat and humidity were established to clarify the influence of an electric heat tracing system on the heat transfer performance of concrete at an early age, based on the concepts of equivalent age and hydration degree. Additionally, the COMSOL numerical simulation software was used for realizing the numerical solution of concrete heat transfer. The research indicates that the degree of hydration is affected by the heating provided by the electric heat tracing system. When curing for 40 h, the degree of hydration approaches 0.82 and remains unchanged, which indicates that the hydration of cement was almost complete in less than 2 days. The specific heat value of concrete in the early stage was significantly affected by electric heat tracing. This value of concrete at a high initial temperature was larger than that at a low temperature, while the specific heat of each point in the later stage tended to be the same. The thermal conductivity was significantly affected by the local electrical heating. The higher the temperature was, the lower the thermal conductivity was, which remained stable for two days under the influence of temperature. The key contribution of this research is to provide a coupling model for concrete curing. The findings from the study also provide industry practitioners with a comprehensive guide regarding the specific applications of the electric heating system in early-age concrete curing.

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“…As the moisture content increases, the specific heat capacity also increases. Low et al [31] propose the relationship between the concrete specific heat capacity and moisture content.…”

Section: Specific Heat Capacitymentioning

confidence: 99%

“…Based on Schindler's formula and Low's results [31], a formula for calculating the thermal conductivity coefficient of concrete was established considering the influence of the concrete moisture content and hydration degree:…”

Section: Thermal Conductivity Coefficientmentioning

confidence: 99%

Coupled Analysis of Thermofluid-Structure Field for Thermal Properties of Early-Age Concrete Influenced by Electric Heating System

et al. 2022

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“…Compressive properties of ALC panels have been reported [11,12]. Many experts have examined the other features of ALC panels, showing that autoclaved aerated concrete exhibits good functional performance and dynamic characteristics [13][14][15]. Although ALC panels are usually considered non-structural components, interaction performance still exists between these panels and boundary steel frames under seismic loads.…”

Section: Introductionmentioning

confidence: 99%

Cyclic Behavior of Autoclaved Aerated Concrete External Panel with New Connector

Cui

Ding

et al. 2022

Materials

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In this paper, a new slip-type crossing connector is proposed for autoclaved aerated concrete (ALC) panels with steel frames, and the proposed connector is also studied deeply in terms of seismic performance. The research included pseudo-static tests and finite element simulations. First, the seismic performance of slip-type crossing connectors and standard L-hooked bolts was studied comparatively, including the stability, bearing capacity, stiffness, energy dissipation, and hysteresis performance. ABAQUS 2020 software was used to establish finite element models, and the results of the experiments were verified with simulations on the basis. According to the simulations, a parameter analysis of connector optimization was carried out. The effects of connector thickness and connector plate length on the seismic performance were further investigated. From the experimental and simulation results, the slip-type crossing connector has excellent performance and good assembly efficiency, it can improve the deficiencies of the existing connectors. The comparison demonstrated that the slip-type crossing connector has a complete hysteresis curve, a high energy dissipation capacity, and a 9.7% increase in bearing capacity. The appropriate reduction in connector thickness and plate length can ensure superior seismic performance while saving resources. The finite analysis method can guide the design and implementation of new external ALC panel connectors.

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“…Thermal conductivity is a physical quantity to characterize the thermal conductivity of materials. The thermal conductivity of concrete increases with the increase of cement [1,2] and aggregate [3], and significantly changes with the change of porosity. The overall thermal conductivity of concrete is the result of the combined effect of the thermal conductivity of silicate structure and the thermal conductivity of the air contained.…”

Section: Introductionmentioning

confidence: 99%

Test and Calculation Model of Thermal Conductivity of Concrete

Liu

Wang

2022

KEM

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In order to study the influence of water content and hydration degree on the thermal conductivity of concrete, based on the steady-state plate method, the influence of water content, temperature, hydration degree and other factors on the thermal conductivity of early concrete was studied, and the calculation model of thermal conductivity of early concrete was established according to the test results and influence rules. The results show that there is a linear relationship between the thermal conductivity and water content at 28d, the higher the hydration degree is, the lower the thermal conductivity of concrete is; the difference between the measured value and the calculated model value is small, and the calculation formula can meet the requirements of engineering calculation.

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Thermal conductivity of soil-based aerated lightweight concrete

Cited by 9 publications

References 18 publications

Coupled Analysis of Thermofluid-Structure Field for Thermal Properties of Early-Age Concrete Influenced by Electric Heating System

Coupled Analysis of Thermofluid-Structure Field for Thermal Properties of Early-Age Concrete Influenced by Electric Heating System

Cyclic Behavior of Autoclaved Aerated Concrete External Panel with New Connector

Test and Calculation Model of Thermal Conductivity of Concrete

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