Properties Of Composite Binder Research Articles

Influence of complex additives based on sulfoaluminate cement on the properties of composite binder

One urgent issue today is reducing CO2 emissions worldwide. In particular, the study of using sulfoaluminate cement to create less CO2 is a suitable solution. The paper presents compound additives' influence on the composite binder's standard consistency. Binders such as sulfoaluminate cement, natural gypsum, and tripoli are used as additives. The resulting binder's standard consistency was determined per GOST 310.3-76. Box-Wilson central composite design method was used to simulate the test results. The results obtained are presented as the surface of the second-level regression equation, which describes the dependence of the mixed binder's standard consistency on the additives' content. Research results have been obtained from compositions of composite binders with maximum and minimum standard consistency. Based on the analysis of experimental data, conclusions were drawn about the possible mechanism of the effect of the introduced additives on the consistency of the cement paste.

ПОЛУЧЕНИЕ ВЯЖУЩИХ КОМПОЗИЦИЙ ОПТИМАЛЬНЫХ СОСТАВОВ НА ОСНОВЕ ПОРТЛАНДЦЕМЕНТА И ОТХОДОВ БОЯ КЕРАМИЧЕСКОГО КИРПИЧА

When developing composite binders of a certain functional purpose, it is necessary to rationally select raw materials, taking into account their chemical, mineral and granulometric composition. The use of mechanical activation with the choice of the most suitable grinding unit affects the creation of binder compositions, the functional additives used have a significant impact on the properties of composite binders.
 The article presents the results of obtaining binder compositions of optimal composition based on Portland cement and broken ceramic bricks. Experimental studies of the granulometric composition have been carried out, the results of tests of binder compositions of the compositions: cement – broken ceramic bricks prepared in a mill are given. Compositions of binder compositions with a wide range of use of ceramic cullet waste – brick production waste have been developed and installed.
 Using the method of electron microscopy, the features of the microstructure of chips of cement stones synthesized on the basis of Portland cement and various content of mineral filler – ceramic brick slaughter waste, mechanically activated in a vibration mill, were studied. It is noted that the open pores of cement stone chips, synthesized binders, are densely overgrown with various neoplasms of various sizes.
 It has been established that the microstructure of hydrated binder compositions is marked by a dense structure due to the use of powdered brick cullet, which compact the structure of the composite, and it is also noted that grains of calcium hydrosilicates grow on the mineral particles of the filler, compacting the overall structure of the composite.

Composite systems using ash from burning production waste

This article proposes a method of obtaining composite solutions using ash from industrial wastes as a structuring additive. Their introduction into the technology of composite solutions not only as modifiers of the structure and properties of composite binders, but also as fine additives, can significantly reduce the cement consumption and prevent waste placement, as well as, improve the performance properties of the latter and obtain new promising types of materials.During this study, the chemical and mineral composition of the ash was determined and the hazard class was calculated. Structure formation in composite solutions was studied when cement was replaced with different amounts of ash. The possibility of replacing 10% of cement with ash without loss of the technological parameters of the system has been established.

Свойства композиционного вяжущего на основе наноструктурированной суспензии

Свойства композиционного вяжущего на основе наноструктурированной суспензии

Development of fly ash-based composite binder and its application in construction materials

The effect of addition of metakaolin on hydration and physico-chemical properties of fly ash composite binder prepared by blending 50–60% fly ash with hydrated lime sludge, Portland cement and gypsum plaster were investigated. The metakaolin has a beneficial effect on the properties of composite binder by reducing its porosity and pore diameter with curing period which are responsible for the attainment of high strength and better stability towards water over the composite binder without metakaolin. The strength development in composite binder takes place due to the hydration of gypsum plaster to gypsum and pozzolanic reaction of fly ash, metakaolin with lime and alkali in cement thereby forming ettringite, tobermorite and C4AH13. The reaction products formed during the hydration were confirmed by X-ray diffraction, differential thermal analysis and scanning electron microscopy. The composite binder has low heat of hydration and is found suitable for use in masonry works, concrete and bricks.

Anhydrite/hemihydrate-blast furnace slag cementitious composites: Strength development and reactivity

This paper reports on the hydration and properties of composite binders with 20–70% blastfurnace slag and 50–70% calcium sulphate (commercial hemihydrate or waste anhydrite) cured for up to 600days; other small additions included silica fume or fly ash. Formulations of gypsum-based binders with good mechanical and hydraulic properties were obtained. Isothermal conduction calorimetry and non-evaporable water indicated that rapid initial gypsum formation is responsible for the initial strength: hemihydrate reacts intensively, whereas anhydrite reacted slower but resulted in better mechanical properties. Selective chemical dissolution demonstrated that slag hydration was slow but constant in the first 28days.