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Article RSE 14005501

Reuse of woody biomass fly ash in cement based materials

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Construction & Building Materials, vol. 76 (2015), pp. 286–296, Novembre-2014.

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M. Berra (RSE SpA) , M. T. Mangialardi (Università di Roma La Sapienza), A. E. Paolini (Università di Roma La Sapienza)

EVOLRETE 2014 - Evolution and planning of the national electric system

Woody biomass fly ash (WBFA) can be reused as a mineral admixture or as a filler/partial sand replacement material in cementitious mixes. Even if the studied WBFAs did not meet the EN requirements for reuse as mineral admixtures, satisfactory technological properties were exhibited by most related blended cements. Their reuse as a filler/ partial sand replacement material was also found to be satisfactory for low-quality concrete.

The reuse of woody biomass fly ash (WBFA) as a mineral admixture or as a filler/partial sand replacement material in cementitious mixes was investigated. Three different WBFAs were used, two coming from virgin wood and one from treated wood combustion. The physical and chemical characteristics of these ashes and the technological properties (workability, setting, compressive strength) of cementitious mixes incorporating WBFA were evaluated.

It was found that, in spite of the satisfactory technological properties exhibited by most related blended cements, the studied WBFAs did not meet the EN requirements for reuse as mineral admixtures, even if they were subjected to a preliminary water-washing treatment. The reuse of raw wood fly ash as a filler/ partial sand replacement material was found to be satisfactory and possible for low-quality concrete.

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