Experimental Study of the Thermal Conductivity of Sand Soils of Different Dry Densities and Water Contents with the Needle Probe Method

2018 ◽  
Author(s):  
Lin-kang ZHOU ◽  
Hua JIN ◽  
Yi GUO ◽  
Hong-kai DENG ◽  
Qiang ZHENG
Keyword(s):  
Thermal Conductivity ◽  
Experimental Study ◽  
Probe Method ◽  
Needle Probe ◽  
Water Contents

scholarly journals Evaluation of the influence of the degree of saturation, measuring time and use of a conductive paste on the determination of thermal conductivity of normal and lightweight concrete using the hot-wire method

2021 ◽  
Vol 71 (344) ◽  
pp. e260
Author(s):  
D. Revuelta ◽  
J.L. García-Calvo ◽  
P. Carballosa ◽  
F. Pedrosa
Keyword(s):  
Thermal Conductivity ◽  
Lightweight Concrete ◽  
Probe Method ◽  
Degree Of Saturation ◽  
Hot Wire ◽  
Measuring Time ◽  
Needle Probe ◽  
Cement Based Materials ◽  
Wire Method

The determination of thermal conductivity of cement-based materials is relevant from the perspective of buildings’ energy efficiency. The absence of unified tests for its measurement in mortars and concrete results in a heterogeneity of the data available in the literature. This work’s purpose is to determine the relevant influence from a a statistical viewpoint that three factors; degree of saturation, measuring time and use of a conductive paste, have in the measurement of the conductivity using the hot-wire needle probe method in two concretes with different thermal behavior: standard-weight concrete and lightweight concrete. The results obtained allow for the establishment of recommendations for future researchers on the minimum information to be included in their reports of thermal conductivity of cement-based materials by the needle probe method, the need to treat outliers, the most favorable saturation conditions and measuring times, as well as the possible benefits of using conductive pastes.

Thermal conductivity of selected claystones and mudstones from England

Clay Minerals ◽  
1998 ◽  
Vol 33 (1) ◽  
pp. 131-145 ◽  
Author(s):  
K. Midttømme ◽  
E. Roaldset ◽  
P. Aagaard
Keyword(s):  
Thermal Conductivity ◽  
Grain Size ◽  
Water Content ◽  
Geometric Mean ◽  
Probe Method ◽  
Size Distributions ◽  
Needle Probe ◽  
Grain Size Distributions ◽  
London Clay ◽  
Thermal Conductivities

AbstractThe claystones and mudstones investigated are London Clay, Fullers Earth, Oxford Clay and Kimmeridge Clay. The thermal conductivities were measured using a divided bar apparatus and the values measured perpendicular to layering ranged from 0.68 to 0.97 W/mK. Comparative measurements of thermal conductivities were carried out by the needle probe method and Middleton's method. Deviations of up to 50% were obtained between the needle probe and the divided bar method. The thermal conductivities estimated from the geometric mean model based on mineralogy and water content ranged from 0.87 to 2.01 W/mK, considerably higher than the measured values. A correlation was found between the grain size distributions of the samples and the measured thermal conductivities. This textural effect on the thermal conductivity is assumed to be the main reason for the low measured values and the lack of correlation between the measured and the calculated values.

scholarly journals Experimental Study and Modelling of the Thermal Conductivity of Sandy Soils of Different Porosities and Water Contents

2017 ◽  
Vol 7 (2) ◽  
pp. 119 ◽  
Author(s):  
Hua Jin ◽  
Yu Wang ◽  
Qiang Zheng ◽  
Hu Liu ◽  
Edmund Chadwick
Keyword(s):  
Thermal Conductivity ◽  
Experimental Study ◽  
Sandy Soils ◽  
Water Contents

scholarly journals Thermal Conductivity Measurements of Float Glass at High Temperatures by Needle Probe method.

2000 ◽  
Vol 108 (1256) ◽  
pp. 381-386 ◽  
Author(s):  
Hiroshi KIYOHASHI ◽  
Naoya HAYAKAWA ◽  
Shin'ichi ARATANI ◽  
Hidetoshi MASUDA
Keyword(s):  
Thermal Conductivity ◽  
High Temperatures ◽  
Float Glass ◽  
Probe Method ◽  
Conductivity Measurements ◽  
Needle Probe
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