On the Corrosion Resistibility of Silica Cement (Part-II)
It was shown that corrosion resistibility of portland cement to mineral acids, under ground water and sugar solution, was increased and its alkali aggregate reaction was inhibitted both by the admixture of Beppu earth.In this case, the decrease of free lime in hydrates of silica cement was quantitatively confirmed by lime absorbing test, thermal analysis, and X-ray spectrograph.
Abstract The study of the stone surface was helpful before the restoration of the Sevilla City Hall facade. This study supplied information of the environmental factors affecting the stone and the restoration treatments used in previous interventions. The stone was thin grained carbonate constituted essentially by fragments of bioclasts and fine sand. The stone was covered by an acrylic resin. Black crust was found. Gypsum and mortars has been added to cover losses of pieces or to fix fragments of stones. A layer of lime on the surface was also detected.