Materiales de Construcción, Vol 38, No 211 (1988)

Contribución al análisis y estudio de las posibilidades de variación de la cantidad de yeso, CaS04.2 H2O, como agresivo, del método acelerado de ensayo ASTM C452 [Continuación (1)] Parte I B


https://doi.org/10.3989/mc.1988.v38.i211.830

Rafael Talero Morales
ICCET/CSIC, Spain

Abstract


The reader should first refer to the summary of the first part of this work (published in Materials de Construction, no. 209) in order to have a clearer idea of the subject being dealt with herein.
In this part of the work, the experimental results of the ECO parametre (Evolution of Organoleptic Characteristics of the Test Pieces) are given, in order that they be interpreted along with those of the " Δ L (%) and Δ L (%)/g cement parametres, given in Part IA (1).
These experimental results have shown that:
1.°) The pozzolanic cement PUZ-8 withstood plaster aggression better than the P-1 (14.11% C3A) and the P-31 (7.62% C3A). This better behaviour should not, cannot, be extended de facto to all other pozzolanic cements, nor to all quantities greater than 30.11 % plaster (~ 14.0% SO3) used as aggressive agents.
2.°) The use as aggressive agents of quantities of plaster greater than 15.05% (7.0% SO3), specified expressly by the ASTM C 452 method, has proved of possible interest to those who must judge necessary and/or advise the use of a given cement resulting from their judgement.
3.°) The degree of response — of the Δ L (%) parametre, in the case of 12.0% SO3) and test pieces aged 28 days, and — of the Δ L (%)/g cement parametre, in the case of 14.0% SO3) and test pieces aged 14 days,
appear to be the most appropriate for grading more precisely cements being tested in this way.

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