Abstract It is well known that cement production not neutral for natural environment among others due to high CO 2 emission. Different strategies of mitigation negative environmental impact its are developed. One the ways utilization supplementary cementitious materials (SCMs) in manufacture and concrete. Introduction aluminosilicate SCMs into binding mixture makes more amount so-called C–A–S–H phase appears hydration products, affecting microstructure properties final hardened composite....

Binders containing fly ash as cement substitute have been used for many years. Typical amount of in composite does not exceed 35% mass binder. Replacement substantial by results retardation hydration binder and deterioration some concrete properties, e.g. delay setting time reduction early compressive strength. These inconveniences may be reduced using proper method activation. In this paper, possibilities to activate binding mixtures high very low Portland were discussed basing on the...

The influence of spent catalyst from catalytic cracking in fluidized bed (FCC) on the hydration two kinds calcium aluminate cements (of about 40 and 70% content alumina) was studied. Cement pastes were prepared with constant ratio water/binder = 0.5 0, 5 25% mass addition as replacement cement. samples stored at room temperature. Thermal analysis (TG, DTG), infrared absorption (FTIR) X-ray diffraction methods applied to investigate changes various periods (up 150 days). compressive strength...

The paper presents the results of research identifying hydration products present in hardened fly ash–slag pastes considered as alternative non-clinker binder. Thermal analysis (TG/DTG), infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) were used complementary methods. contained binder made two components: ash from circular fluidized bed combustion brown coal ground granulated blast furnace slag. components mixed accordingly to five formulas differing proportions, but with...

The influence of three mineral additives, i.e. fly ashes from pulverized combustion and fluidized hard coal as well Portland cement, on early hydration (up to 28th day) calcium aluminate cement was investigated. Cement pastes containing 0, 5 25 wt% additives were studied by the use calorimetry, thermal analysis infrared spectroscopy methods. It confirmed that is closely dependent type addition its amount. different properties discussed basing received results other literature reports.

Cement industry emits large amount of CO2. One the ways to reduce this emission is use cement replacements, such as fly ash, in binding mixtures. Blends containing ash exhibit different properties compared typical portland cement. In case very high used substitute cement, setting and hardening are elongated, early compressive strength also often ultimate reduced. Thus, blends require activation. The aim work was clarify influence chemical activators (Ca(OH)2 Na2SO4 together) on...

Comparison of the influence temperature and different alkali activators on reactivity two types fly ash (conventional, fluidized) was presented. The main emphasis put fluidized as potential component binding mixtures containing low amount cement. Conventional used a reference. It found that for these materials key differences affecting products activation are: availability calcium sulfate ions well structure grains influencing dissolution aluminate silicate species. Fluidized ash, contrary...

Reducing the consumption of cement with simultaneous utilizing waste materials is preferred for reasons environmental protection. Typical content substituting in concrete composition does not exceed 35% mass binder. More and more interest aroused to increase amount supplements above 50%. The mechanism hydration processes such complex systems fully understood. aim this work discuss possibilities using binders high replacements, particular regard physical chemical occurring after addition...

The aim of this work is to investigate the influence selected alkaline activators on pozzolanic and hydraulic activities fly ashes using thermal analysis (TG/DTG) infrared spectroscopy (FTIR). Two types differing in chemical compositions, especially content calcium components, were for investigations. study was carried out two samples: (1) ash–lime paste performed with low-calcium ash (2) a high-calcium water without introduction additional amount Ca(OH)2. Chemical admixtures NaOH, Na2SO4,...

The aim of the research is a comprehensive evaluation concrete using EIPI method. In compressive strength and its durability properties represented by sorptivity air permeability are taken into account. Since waste copper slag with increased natural radioactivity used in assessed concrete, additional carried out taking account influence within performance index. Additionally, reference which made without use slag, evaluated for comparative purposes. order to make as possible, three types...

Results of research on hydration four-component binders containing very high amounts supplementary cementitious materials were presented. The samples composed blended pozzolana (a mix conventional fly ash and spent aluminosilicate catalyst), cement (about 20 wt.% in the binder) Ca(OH)2. Spent catalyst was proposed as activating component which can improve properties low-cement blends, while role Ca(OH)2 to enhance pozzolanic reaction. Early later periods such blends investigated by...

In order to reduce the negative impact of cement production on natural environment, and in particular CO2 emission, new types binders are sought. It is beneficial use supplementary cementitious materials, such as fly ash. A very high volume ash a reduced amount binder can, however, result deterioration some properties final composite. Such systems require activation. The aim this work was investigate effects different activators: spent aluminosilicate catalyst (very active pozzolanic...

Abstract Introducing supplementary cementitious materials (SCM), e.g. fly ash, into cement composite results in ecological benefits. However, the case of high amount SCM used as a replacement part cement, there are problems related to development desired properties final composite. Such mixtures often require activation. In first this series publications, chemical activation (using Na 2 SO 4 and Ca(OH) ) mixture with very content ash were discussed. The aim work was investigate influence...