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INFLUENCE OF SELECTED MICRO ADDITIVES CONTENT ON THERMAL PROPERTIES OF GYPSUM

Justyna CIEMNICKA
Justyna CIEMNICKA
, 
Roman JASKULSKI
Roman JASKULSKI
, 
Wojciech KUBISSA
Wojciech KUBISSA
 and 
Karol PRAŁAT
Karol PRAŁAT
   | Oct 18, 2019
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Article Category: research-article
Published Online: Oct 18, 2019
Page range: 69 - 79
Received: Mar 28, 2019
Accepted: Jul 03, 2019
DOI: https://doi.org/10.21307/acee-2019-037
Keywords
© 2019 Justyna CIEMNICKA et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Figure 1.

Fluid flow through a parallelepiped
Fluid flow through a parallelepiped

Figure 2.

Experimental setup to measure conductivity λ, specific heat capacity Cp and thermal diffusivity a: 1 – tested specimen, 2 – surface probe, 3 – microprocessor-controlled Isomet instrument, 4 – PC computer, 5 – AC/DC power supply
Experimental setup to measure conductivity λ, specific heat capacity Cp and thermal diffusivity a: 1 – tested specimen, 2 – surface probe, 3 – microprocessor-controlled Isomet instrument, 4 – PC computer, 5 – AC/DC power supply

Figure 3.

Thermal conductivity changes of gypsum specimens during aging process for pure gypsum with different additives: a) polymer, b) aerogel, c) microspheres
Thermal conductivity changes of gypsum specimens during aging process for pure gypsum with different additives: a) polymer, b) aerogel, c) microspheres

Figure 4.

Thermal conductivity changes of modified gypsum specimens during aging process between 14 and 35 days of measurement
Thermal conductivity changes of modified gypsum specimens during aging process between 14 and 35 days of measurement

Figure 5.

Specific heat changes of gypsum specimens during aging process for pure gypsum with different additives: a) polymer, b) aerogel, c) microspheres
Specific heat changes of gypsum specimens during aging process for pure gypsum with different additives: a) polymer, b) aerogel, c) microspheres

Figure 6.

Thermal diffusivity changes of gypsum specimens during aging process for pure gypsum with different additives: a) polymer, b) aerogel, c) microspheres
Thermal diffusivity changes of gypsum specimens during aging process for pure gypsum with different additives: a) polymer, b) aerogel, c) microspheres

Figure 7.

Thermal conductivity coefficient versus bulk density of gypsum specimens with different moisture contents and different micro additives: a) polymer, b) aerogel, c) microspheres
Thermal conductivity coefficient versus bulk density of gypsum specimens with different moisture contents and different micro additives: a) polymer, b) aerogel, c) microspheres

Figure 8.

Specific heat versus bulk density of gypsum specimens with different moisture contents and different micro additives: a) polymer, b) aerogel, c) microspheres
Specific heat versus bulk density of gypsum specimens with different moisture contents and different micro additives: a) polymer, b) aerogel, c) microspheres

Figure 9.

Thermal diffusivity versus bulk density of gypsum specimens with different moisture contents and different micro additives: a) polymer, b) aerogel, c) microspheres
Thermal diffusivity versus bulk density of gypsum specimens with different moisture contents and different micro additives: a) polymer, b) aerogel, c) microspheres

Figure 10.

Thermal conductivity coefficient versus bulk density for different type of micro additives content after 35 days of aging
Thermal conductivity coefficient versus bulk density for different type of micro additives content after 35 days of aging

Bulk density and total porosity of gypsum composites after 35 days

Parameters Building materials
Pure gypsum Gypsum and polymer Gypsum and microspheres Gypsum and aerogel
Bulk density (kg/m3) 998 940 921 920
Total porosity (%) 57.5 60.0 60.8 60.9

Constants A, B, C, D, E and F of equations (5–7)

Building materials Constants
A B R2 C D R2 E F R2
Pure gypsum 0.0010 0.7176 0.9782 0.5799 2.087 0.9871 0.0005 0.2984 0.9686
Gypsum and polymer 0.0012 0.8886 0.9943 0.6985 2.225 0.9689 0.0006 0.3622 0.9751
Gypsum and microspheres 0.0012 0.8090 0.9947 0.7230 2.275 0.9919 0.0006 0.3476 0.9936
Gypsum and aerogel 0.0013 0.8520 0.9918 0.6521 2.230 0.9965 0.0006 0.3290 0.9833

Values of thermal conductivity λ, specific heat Cp , thermal diffusivity a, standard deviations σ and uncertainty of variation u of the pure gypsum and gypsum with additives polymer, aerogel and microspheres after 35 days

Parameters Materials
Pure gypsum Gypsum and polymer Gypsum and microspheres Gypsum and aerogel
Thermal conductivity λ (W/(m⋅K)) 0.3004 0.2556 0.2778 0.2821
Standard deviation σλ (W/(m⋅K)) 0.0039 0.0069 0.0088 0.0072
Uncertainty uλ (W/(m⋅K)) 0.0022 0.0034 0.0044 0.0035
Specific heat Cp (J/(kg⋅K)) 1,520 1,597 1,594 1,630
Standard deviation σCp (J/(kg⋅K)) 31 14 31 87
Uncertainty uCp (J/(kg⋅K)) 11 8 17 49
Thermal diffusivity a (mm2/s) 0.1923 0.1716 0.1930 0.2074
Standard deviation σa (mm2/s) 0.0018 0.0023 0.0087 0.0095
Uncertainty ua (mm2/s) 0.0009 0.0012 0.0044 0.0049
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