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Effects of moisture content (MC) variation and existence of gaps were analyzed.
Increase of MC causes the reduction of class="mathmlsrc">class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0950061816314374&_mathId=si2.gif&_user=111111111&_pii=S0950061816314374&_rdoc=1&_issn=09500618&md5=ab7194cd0b8291f0c1ff78a7b99fa471" title="Click to view the MathML source">faxclass="mathContainer hidden">class="mathCode"> for almost all test configurations.
Relative humidity cycle results in high decreases of class="mathmlsrc">class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0950061816314374&_mathId=si2.gif&_user=111111111&_pii=S0950061816314374&_rdoc=1&_issn=09500618&md5=ab7194cd0b8291f0c1ff78a7b99fa471" title="Click to view the MathML source">faxclass="mathContainer hidden">class="mathCode">.