Mortar

About: Mortar is a research topic. Over the lifetime, 25024 publications have been published within this topic receiving 218739 citations.

Studies on cement and mortar containing low-calcium fly ash, limestone, and dolomitic limestone

Abstract: The effects of low-calcium fly ash (FA), limestone (LS), and dolomitic limestone (DLS) on the properties of cement and mortar has been investigated through a number of tests. Composition of cement hydration products in cement paste and mortar were made with clinker (PC), gypsum (G), FA, LS and DLS. The binders employed were Portland cement (OPC), fly ash–portland cement (FA–OPC), FA–LS–OPC, and FA–DLS–OPC blends with a maximum PC replacement level of 40%, FA level of up to 40%, LS and DLS levels of up to 15%. The hydration rate and products were studied by means of X-ray diffraction (XRD) and Fourier transforms infrared spectroscopy (FTIR). The results showed that the FA, LS and DLS prolong the setting time of the cements. Relative to OPC, in FA–OPC system expansion decreases as the fly ash content of the cement increases. Ternary system, FA–DLS–OPC produces a marked fall in the expansion of the tested specimens.

Test methods for Textile Reinforced Mortar systems

Abstract: Textile Reinforced Mortar (TRM) composites, also named Fabric Reinforced Cementitious Matrix (FRCM), comprise high strength textiles embedded into inorganic matrices, and have been recently developed for the repair and rehabilitation of structures. Their effectiveness and compatibility with the substrate fostered the industrial development of a wide number of strengthening systems, which have been applied to masonry and reinforced concrete structures. Nevertheless, an improved knowledge still needs to be gained on their mechanical properties (tensile and bond behaviour) and on the effect they have on the structural performance of reinforced members. Furthermore, except for the US, no standards are available for testing, qualification and design. In this paper, the main features of the tensile and bond behaviour of TRM composites are described. Recommendations for performing direct tensile tests and shear bond tests are proposed, based on the outcomes of a Round Robin Test organized by the Rilem TC 250-CSM (Composites for the Sustainable strengthening of Masonry) and Assocompositi (Italian Industry Association for Composite Materials), carried out on 26 TRM systems (made of basalt, carbon, steel, glass, PBO and aramid textiles, with cement, lime or geopolymer mortar matrices), and involving 19 European research institutions and 11 industrial partners.

Use of granite sludge wastes for the production of coloured cement-based mortars

Abstract: The value of granite sludge wastes (GS) in cement-based mortar formulations was examined by assessing their potential as structural components and pigments. Full characterization of GS was accomplished by X-ray fluorescence (XRF), X-ray diffraction (XRD), laser diffraction and scanning electron microscopy. GS were found to be an effective filler or pozzolanic material for mortars. Also, GS were easily converted into a reddish pigment by calcination at low temperatures (700–900 °C) for a short time. UV–Vis–NIR spectra, colourimetric parameters and XRD analysis confirmed the presence of α-Fe2O3 in the pigment. Therefore, the preparation of coloured mortar with good compressive strength can be an attractive, environmentally friendly method of managing granite sludge wastes.