Alkaline Fly-Ash Cements and concretes, influence of care on early stage of hardening

There are a lot of not well investigated processes in alkaline fly-ash cement technology. Among them the role o f fly-ash type and type o f alkaline component in structure formation processes in different stages, new phases formation and connected with this properties of cements and concretes, including corrosion resistant, durability and other. It was necessarry to investigave influence of concrete care curing, humidity temperature on properties of fly ash-alkaline concrete, on their early stage strength, stability and possibility to self-destruction.Also, it is important to now about strength development o f different types o f alkaline fly-ash cements and concretes on their base in time and special properties o f such material, especially m case of investigation possibility to uncover fresh concrete surface

Hybrid fly ash based alkali activated cements

Alkaline activation is one of the most perspective ways for creating very high volumes fly ash cements. The main phases of structure in such “hybrid” systems are represented by mixes N-A-S-H and N-C-A-S-H new formations. The paper is showing differences in structure formation and properties of low-Ca and high-Ca-containing fly ash alkali activated cements. Appropriate pplications are shown

Alkali activated cements mix design for concretes application in high corrosive conditions

This paper covers the results of development of corrosion resistant ash alkali-activated cements based on regulation of phase composition of the hydration products through changing the alkali content, content of calciumcontaining cement constituents resulting in the increase strength and density of the cement stone. The results of study suggested to conclude that the cement compositions with predominance in the hydration products of weakly soluble low basic hydrosilicates of calcium, hydrogarnets and minerals similar to natural hydroaluminates exhibited the highest corrosion resistance. The results of comparison suggested to draw a conclusion that the alkali-activated cements Types APC III-400 and ACC V-400, according to National Ukrainian Standard DSTU B V.2.7, had high corrosion resistance compared to that of OPC, thus allowing to recommend the developed cements for the concretes intended for use in aggressive environments, inclusive of sodium and magnesium sulphates and others. Coefficients of corrosion resistance of concretes are higher than 1 after even 42 months

Alkali activated cements mix design for concretes application in high corrosive conditions

This paper covers the results of development of corrosion resistant ash alkali-activated cements based on regulation of phase composition of the hydration products through changing the alkali content, content of calciumcontaining cement constituents resulting in the increase strength and density of the cement stone. The results of study suggested to conclude that the cement compositions with predominance in the hydration products of weakly soluble low basic hydrosilicates of calcium, hydrogarnets and minerals similar to natural hydroaluminates exhibited the highest corrosion resistance. The results of comparison suggested to draw a conclusion that the alkali-activated cements Types APC III-400 and ACC V-400, according to National Ukrainian Standard DSTU B V.2.7, had high corrosion resistance compared to that of OPC, thus allowing to recommend the developed cements for the concretes intended for use in aggressive environments, inclusive of sodium and magnesium sulphates and others. Coefficients of corrosion resistance of concretes are higher than 1 after even 42 months

Alkaline Fly-Ash Cements and concretes, influence of care on early stage of hardening

There are a lot of not well investigated processes in alkaline fly-ash cement technology. Among them the role o f fly-ash type and type o f alkaline component in structure formation processes in different stages, new phases formation and connected with this properties of cements and concretes, including corrosion resistant, durability and other. It was necessarry to investigave influence of concrete care curing, humidity temperature on properties of fly ash-alkaline concrete, on their early stage strength, stability and possibility to self-destruction.Also, it is important to now about strength development o f different types o f alkaline fly-ash cements and concretes on their base in time and special properties o f such material, especially m case of investigation possibility to uncover fresh concrete surface