1,721,088 research outputs found
PROTECTION AND CONSOLIDATION OF TUFACEOUS STONES WITH SODIUM ALUMINATE
No full textTESTO SU SUPPORTO INFORMATC
PROTECTION AND CONSOLIDATION OF TUFACEOUS STONES WITH SODIUM ALUMINATE
No full textTESTO SU SUPPORTO INFORMATC
SODIUM ALUMINATE AN EFFICIENT PROTECTIVE-CONSOLIDANT OF NEAPOLITAN YELLOW TUFF STONE
No full textTHE PAPER DESCRIBES THE UTILIZATION OF SODIUM ALUMINATE AS A PROTECTIVE AND/OR AS A CONSOLIDANT OF YELLOW NEAPOLITAN TUFACEOUS STONE, WIDELY USED AS BUILDING MATERIAL IN CAMPANIA REGION (SOUTHERN ITALY). BY COMPARING CHARACTERISTICS OF UNTREATED AND TREATED TUFF SAMPALES AN INCREASE OF APPARENT DENSITY AND A DECREASE OF APPARENT POROSITY, BOTH OF THE ORDER OF 10%, WERE FOUND. ON THE OTHER HAND BENDING TESTS UNDERLINED AN INCREASE IN MECHANICAL STRENGHT OF THE ORDER OF 40% AS A CONSEQUENCE OF THE Na-ALUMINATE TREATMENT
An approach for a rapid determination of the aging time of lime putty
No full textA method for determining the effective and long aging time of lime putty, a feature which favors better quality of the corresponding lime mortar, is proposed. Different quicklime precursors were slaked under an excess of water for different times ranging from 3 to 66 months. Each of resulting lime putty was dehydrated by lyophilization and after characterized by thermo-gravimetric analysis (TGA), X-ray diffraction (XRD) analyses, scanning electron microscopy (SEM), and surface area. Taking into account the impurity contents present in the starting quicklime, the mineralogical composition of each lime putty was determined from the weight loss related to the amount of adsorbed water and to the weight losses related to the decomposition of mineral phases present in the lime putty such as brucite, Mg(OH)2, portlandite, Ca(OH)2 and calcite, CaCO3, respectively. The total mineralogical composition of lime putties aged for a time higher than 12 months was close to the expected value of 100%, while such value resulted lower than 100% for lime putties aged for lower times. To justify such result, an incomplete hydration of the quicklime precursor must be considered for lime putties aged for lower times. The delayed hydration can be related to the presence of over burnt of some particles of lime present in the starting quicklime
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