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2. Geomembrane - Wikipedia

   en.wikipedia.org/wiki/Geomembrane

   Thickness (smooth sheet, textured, asperity height) Density; Melt flow index; Mass per unit area (weight) Vapor transmission (water and solvent). Mechanical properties. There are a number of mechanical tests that have been developed to determine the strength of polymeric sheet materials. Many have been adopted for use in evaluating geomembranes.

3. Plus and minus signs - Wikipedia

   en.wikipedia.org/wiki/Plus_and_minus_signs

   The plus sign ( +) and the minus sign ( −) are mathematical symbols used to denote positive and negative functions, respectively. In addition, + represents the operation of addition, which results in a sum, while − represents subtraction, resulting in a difference. [1] Their use has been extended to many other meanings, more or less analogous.

4. Joint compound - Wikipedia

   en.wikipedia.org/wiki/Joint_compound

   Joint compound is used to finish gypsum panel joints filled with paper or fiber joint tape, corner bead, trim and fasteners, and to skim coat. It is also convenient for patching holes, bumps, tears, and other minor damage to existing walls. In North America, troweling joint mud on gypsum panels is a standard construction technique prior to ...

5. Talc - Wikipedia

   en.wikipedia.org/wiki/Talc

   The TOT layers in turn consist of two tetrahedral sheets (T) strongly bonded to the two faces of a single trioctahedral sheet (O). It is the weak bonding between TOT layers that gives talc its perfect basal cleavage and softness. The tetrahedral sheets consist of silica tetrahedra, which are silicon ions surrounded by four oxygen ions.

6. Controlled low strength material - Wikipedia

   en.wikipedia.org/wiki/Controlled_low_strength...

   Since flowable fill is normally a comparatively low-strength material, there are no strict quality requirements for fly ash used in flowable fill or controlled low strength material mixtures. Fly ash is well suited for use in flowable fill mixtures. Its fine particle sizing (nonplastic silt) and spherical particle shape enhances mix flowability.

7. Cut and fill - Wikipedia

   en.wikipedia.org/wiki/Cut_and_fill

   A mass haul diagram where land and rock cuts are hauled to fills Fill construction in 1909 Cut and fill software: view from above. In earthmoving, cut and fill is the process of constructing a railway, road or canal whereby the amount of material from cuts roughly matches the amount of fill needed to make nearby embankments to minimize the amount of construction labor.