Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Self-Healing Watertight Concretes Manufactured with a Carboxylic Acid Waterproofing Admixture
The present paper deals with an experimental research program carried out to evaluate performances of an innovative polycarboxylate acid based waterproofing admixture added in the mixer together concrete traditional ingredients in order to improve concrete watertightness. Reduction of water penetration under pressure in concrete can be ascribed to the precipitation of insoluble salt crystals capable both filling capillary pores and sealing cracks generated by shrinkage in the plastic phase. Rheological (in the fresh state) properties, compressive strength and water penetration under pressure (EN 12390-8) were measured on concretes manufactured with the carboxylic waterproofing admixture and a similar product already available on the market and compared to reference concretes produced by using only the traditional ingredients. Two reference concretes were maufactured with w/c ratio equal to 0.50 and 0.60. Dosage of waterproofing admixture was 1 and 2% by cement mass. The influence of wet curing period (1, 7 and 28 days) on concrete performances was also evaluated. In order to test the sealing ability of the waterprofing admixture, concrete slabs were exposed in a windy chamber (wind velocity 40 km/h and 30% R.H.) to favour crack formation due to plastic shrinkage. Self-healing ability was evaluated by means of water absorption test carried out with Karsten Tubes. Finally, observation with optical microscopy and Scanning Electron Microscope were carried out to assess the crack sealing ability of the waterproofing admixture. Addition of waterproofing products does not affect negatively rheological and mechanical performances of concrete. A significant reduction of water penetration under pressure was recorded for concretes produced with the waterproofing products with respect the reference mixture manufactured with the traditional ingredients only. Reduction of water penetration was detected indipendently of the wet curing period. In cracked slabs produced with the waterproofing admixtures reduction in water ...
Self-Healing Watertight Concretes Manufactured with a Carboxylic Acid Waterproofing Admixture
The present paper deals with an experimental research program carried out to evaluate performances of an innovative polycarboxylate acid based waterproofing admixture added in the mixer together concrete traditional ingredients in order to improve concrete watertightness. Reduction of water penetration under pressure in concrete can be ascribed to the precipitation of insoluble salt crystals capable both filling capillary pores and sealing cracks generated by shrinkage in the plastic phase. Rheological (in the fresh state) properties, compressive strength and water penetration under pressure (EN 12390-8) were measured on concretes manufactured with the carboxylic waterproofing admixture and a similar product already available on the market and compared to reference concretes produced by using only the traditional ingredients. Two reference concretes were maufactured with w/c ratio equal to 0.50 and 0.60. Dosage of waterproofing admixture was 1 and 2% by cement mass. The influence of wet curing period (1, 7 and 28 days) on concrete performances was also evaluated. In order to test the sealing ability of the waterprofing admixture, concrete slabs were exposed in a windy chamber (wind velocity 40 km/h and 30% R.H.) to favour crack formation due to plastic shrinkage. Self-healing ability was evaluated by means of water absorption test carried out with Karsten Tubes. Finally, observation with optical microscopy and Scanning Electron Microscope were carried out to assess the crack sealing ability of the waterproofing admixture. Addition of waterproofing products does not affect negatively rheological and mechanical performances of concrete. A significant reduction of water penetration under pressure was recorded for concretes produced with the waterproofing products with respect the reference mixture manufactured with the traditional ingredients only. Reduction of water penetration was detected indipendently of the wet curing period. In cracked slabs produced with the waterproofing admixtures reduction in water ...
Self-Healing Watertight Concretes Manufactured with a Carboxylic Acid Waterproofing Admixture
COPPOLA, Luigi (Autor:in) / COFFETTI, Denny (Autor:in) / LORENZI, Sergio (Autor:in) / PASTORE, Tommaso (Autor:in) / Coppola, Luigi / Coffetti, Denny / Lorenzi, Sergio / Pastore, Tommaso
01.01.2016
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
Innovative carboxylic acid waterproofing admixture for self-sealing watertight concretes
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