Synthesis Of Binder Research Articles

Low-temperature synthesis of binder with belite content

Sol-gel methods or hydrothermal treatment in combination with low-temperature burning are used for low-temperature syntheses of hydraulically active dicalcium silicate. The paper describes a two-stage preparation process without the use of an autoclave. In the first phase, the precursors of hydraulically active phases are prepared. In the second phase, burning up to 1000 °C takes place to form a C2S-based binder. Unlike commonly used procedures of the sol-gel method, solid raw materials and water are used. The main raw materials are quicklime and a source of SiO2 and then various activators. X-ray diffraction analysis and electron microscopy methods were used for the research. The resulting binders are similar to hydraulic lime, they achieve low initial strengths, the long-term strengths are satisfactory. It is suitable for the preparation of mortars and plaster mixtures.

Synthesis of Binder for Nanoenergetic Composites

Synthesis of Binder for Nanoenergetic Composites

Processing of Dolomitic By-Products into Porous Restoration Binder

The goal of this work concerns the synthesis of a binder for restoration purposes that is physically and chemically compatible with dolomitic Roman cement, a historical binder used for the construction of significant architectural heritage objects in the 19thand 20thcenturies. Dolomitic marlstone, the traditional raw material of dolomitic Roman cement, is not being obtained anymore and it is also hard to achieve a constant chemical composition. To address these issues, the experimental synthesis of a low temperature hydraulic binder using locally sourced raw materials, namely dolomite flour and clay, was performed. The developed synthesis technology provides economic and ecological advantages compared to other similar materials, such as lime with pozzolan additive, lime and cement mixtures and magnesium oxychloride cements. The raw material, dolomite flour, is a by–product in the manufacturing process; furthermore, the low firing temperature (800 °C) reduces the power consumption required to obtain the binder.The aim of the work is determination of porosity-related physical characteristics of dolomitic binder that is synthesized by using manufacturing by-product – dolomite flour – as basic raw material to evaluate it’s suitability for restoration purposes.

Influence of firing temperature on the chemical properties of hydraulic dolomitic binder

The synthesis of a binder from the mixture of dolomite flour and clay is investigated. The main anticipated usage of the binder is for the restoration of historical dolomitic Roman cement objects. During the 19 th /20 th century, in the territory of Latvia dolomitic Roman cement was the main hydraulic binder applied for the construction of buildings. It was processed in Riga since 1865 by firing the local raw material dolomitic marlstone below its sintering temperature (800–900 °C) and by fine milling. Because of its fast setting and good water resistance, the material was used mostly for decorative elements of facades. However, since the middle of the 20 th century its production has been stopped. With the aim to provide a compatible material for restoration needs, compositions from dolomite flour and clay were investigated as a perspective raw material for the synthesis of a low-temperature hydraulic binder. Mixtures from two types of clay and dolomite flour in powder state were synthesized. Clay content in the compositions varied from 13 to 30 %. Samples were prepared by mixing the raw materials, semi-dry pressing and firing at 750–950 °C. The study gives an insight into the chemical processes that occur during the synthesis of a binder from a mixture of clay and dolomite flour. Thermochemical processes in the obtained binder depending on production temperature and clay type were compared by using the XRD analysis and a full chemical analysis. DOI: http://dx.doi.org/10.5755/j01.ct.67.1.14986

Chemical and Physical Processes in the Synthesis of Romancement from Clay and Dolomite

This work deals with the synthesis of binder, similar to historic dolomitic romancement, from mixture of clay and dolomite instead of traditionally used marlstone, thus widening the range of raw materials. In the territory of Latvia dolomitic romancement was widely known and applied in the construction of buildings since late 19th till the middle of 20th century. Nowadays the local dolomitic marlstone is not sufficiently available. As the scientists have faced the problem adjusting compatible material for restoration of historical buildings of given time period, research is done with the aim to investigate the synthesis of romancement type binder from widespread local mineral raw materials for the restoration purposes. In given paper the chemical and physical processes in the synthesis and also obtained properties are discussed.