In this process, the dominant effect of air content on thermal conductivity results in an increasing trend with the rising water–cement ratio.
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Effects of Mixing Techniques and Material Compositions on the Compressive Strength and Thermal Conductivity of Ultra-Lightweight Foam Concrete.
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The sentences
As the water content increases, the amount of moisture that can be lost during the same preservation process also rises, causing a decreasing trend in the wet density of the material with the increasing water–cement ratio.