| Popis: |
The paper presents a laboratory study of lightweight concrete with the standard compressive strength at least 50 MPa. Aggregate “Pollytag” with density of 1.28 g/cm3 and grains up to 12 mm produced from fly-ash from electric power station burning bituminous coal with addition of about 1% of bentonite has been used for the tested concrete. Its mechanical and physical properties such as compressive and tensile strengths, modulus of elasticity, thawing-freezing resistance, water absorbability as well as shrinkage and creep, are determined according to the relevant Polish standards. However, the main part of the paper is devoted to the structural investigation of the lightweight aggregate itself and concrete made with the use this aggregate. The relevant investigations have been performed by means of the scanning electron microscope LEO1430. |
