Scaling resistance of high performance concretes containing a small portion of pre-wetted lightweight fine aggregate |
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| Affiliation: | 1. Department of Civil Engineering, RYMEC, Ballari 583104, Karnataka, India;2. Department of Civil Engineering, BITM, Ballari 583104, Karnataka, India;1. Department of Physical Chemistry, School of Environmental Sciences and Biochemistry, University of Castilla-La Mancha, Av. Carlos III, s/n, 45071 Toledo, Spain;2. Department of Chemical Engineering, School of Civil Engineering, University of Castilla-La Mancha (Spain), Av. Camilo José Cela, 13071 Ciudad Real, Spain;3. Jap Energeticas S.L. Colon, 70, piso 2, 46004 Valencia, Spain;4. Arcillas Refractarias, S.A. (ARCIRESA), Fábrica, Barrio Castiello, s/n, 33690, Lugo de la LLanera, Asturias, Spain;5. INTROMAC, Ave. de la Universidad, s.n, Campus UEx., 10071 Cáceres, Spain;6. Town hall of Cáceres, Plaza Mayor, 1, 10003 Cáceres, Spain |
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| Abstract: | The subject of the investigation was the influence of pre-wetted lightweight aggregate on damage of the concrete surface due to cyclic freezing and thawing in the presence of de-icing salts tested according to the Swedish Standard SS 13 72 44 (the Borås method). Six series of concrete specimens were made with the same water/binder (w/b) ratio 0.32, cement volume 400 kg/m3 and content of superplasticiser 8.8 kg/m3. One series, S3/2, contained an air-entraining agent. Series S4/7 and S4/8 were made with water/cement ratio equal to 0.45 and a lower cement content 340 kg/m3. In a few series the sand fraction 0–2 mm and basalt fraction 2–4 mm were partly or totally replaced by wetted lightweight aggregate. Concretes S3/1, S3/3, S4/7 and S4/8, failed the test. The best results were obtained for concrete S3/6 (with the 2–4 mm fraction replaced by half) and S3/2 (air-entrained). The application of an air-entraining agent is more expensive than LWA, and at a construction site it is not always easy to control. It seems that the replacement of a part of aggregate by LWA could be a more effective way to improve the scaling resistance. |
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