%0 Journal Article
%T Effect of an admixture from Agave americana on the physical and mechanical properties of plaster
%A Ochoa
%A J. C.
%A Bonilla
%A M.
%A Borrachero
%A M. V.
%A Pay芍
%A J.
%J Materiales de Construccion
%D 2013
%I Consejo Superior de Investigaciones Cient赤ficas
%X Physical and mechanical properties of a plaster paste added with an organic admixture, of the leaves of Agave americana, were studied. Plastic consistency behavior was evaluated and the water/gypsum(w/g) ratio was determined for each dosage of the admixture. Admixtur eeffect on setting was evaluated too. The chemical transformation of the hemihydrated form to gypsum (dihydrated form) was studied using a novel technique based on a moisture analyzer by halogen light. Flexural and compressive strengths were measured. The results show that ,for the same consistency, accordingly mechanical strengths were improved too. The setting times were increased which would enhance the application time of plaster and would reduce plastic shrinkage, common problems in this type of material. The changes in these physical properties not substantially affect the final mechanical strengths. Se estudiaron algunas propiedades f赤sicas y mec芍nicas de pastas de yeso de construcci車n adicionadas con un aditivo de origen org芍nico, producto de las hojas de la planta Agave americana. Se evalu車 el comportamiento pl芍stico de la pasta mediante ensayos de consistencia y se determin車, para cada dosificaci車n, su relaci車n agua/ yeso (a/y). Se evalu車 la incidencia del aditivo en los tiempos de fraguado. La transformaci車n qu赤mica del hemihidrato a yeso dihidrato se estudi車 mediante una novedosa t谷cnica basada en un analizador de humedad por luz hal車gena. Se midieron las resistencias mec芍nicas a flexo-tracci車n y a compresi車n. Los resultados del estudio muestran que, para una misma consistencia, se mejoran las resistencias mec芍nicas. Los tiempos de fraguado de la pasta se aumentaron lo que ayudar赤a mejorar los tiempos de aplicaci車n del yeso y a disminuir las retracciones pl芍sticas. Las modificaciones de estas propiedades f赤sicas no afectan considerablemente las resistencias mec芍nicas finales.
%K organic admixture
%K gypsum
%K physical properties
%K hydration
%K halogen moisture analyzer
%K aditivo org芍nico
%K yeso
%K propiedades f赤sicas
%K hidrataci車n
%K analizador de humedad por luz hal車gena
%U http://materconstrucc.revistas.csic.es/index.php/materconstrucc/article/view/1276/1406