Improving the Efficiency of Slag Portland Cement by Reducing Shrinkage Deformations

The influence of the artificial additive introduced at the joint grinding of granulated slag, Portland cement clinker and gypsum on the Portland slag cement hydration, its compression strength at an early stage and shrinkage deformation is investigated. It was found that in the presence of sulfoferrite clinker there is an amorphization of cement stone structure with formation of stone with high density and strength in early setting. The open porosity of the hardened paste is reduced by 13 – 15 % in comparison with plain Portland slag cement. The samples strength increases by 1.55 - 1.78 times at grade stage, by 15.5 - 19.4 % in bending and by 6.4 - 11.2 % in compression.

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Portland cement clinker, granulated slag and by-pass cement dust composites

Cement and Concrete Research ◽

10.1016/s0008-8846(02)00867-0 ◽

2002 ◽

Vol 32 (11) ◽

pp. 1805-1812 ◽

Cited By ~ 31

Author(s):

M Heikal ◽

I Aiad ◽

I.M Helmy

Keyword(s):

Portland Cement ◽

Cement Clinker ◽

Cement Dust ◽

Portland Cement Clinker ◽

Granulated Slag

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Study on the Mix Proportion Design of C30 Supersulphated Phosphogysum-Slag Cement (SSC) Concrete

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1065-1069.1950 ◽

2014 ◽

Vol 1065-1069 ◽

pp. 1950-1956

Author(s):

Sha Ding ◽

Guo Zhi Zhang ◽

Fei Xiang Chen

Keyword(s):

Portland Cement ◽

Optimization Design ◽

Design Method ◽

Steel Slag ◽

Cement Clinker ◽

Slag Cement ◽

Granulated Blast Furnace Slag ◽

Mix Proportion ◽

Portland Cement Clinker ◽

Furnace Slag

supersulphated phosphogysum-slag cement (SSC) is a newly developed non-burned cementitious material. It’s mixed and ground with 40%-50% phosphogypsum, 40%-50% ground granulated blast-furnace slag (GGBFS), 2% steel slag and 4% portland cement clinker. But the component of SSC differs greatly from that of Portland cement, there is few application researches about the SSC. In order to realize resourceful utilization of phosphogypsum, the mix proportion design method of SSC are studied. The mix proportion design method for C30 are systematically studied and a design optimization was carried out. According to the design regulations of mix proportion of ordinary concrete and the characteristics of SSC, the C30 high flowing concrete is prepared, and the optimum water-cement ratio is obtained based on revised Bowromi formula. According to the mix proportion optimization design, the 28d strength of SSC is up to 38.5MPa.

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Industrial experience in the implementation of clinker-free binders of alkaline activation

Herald of Dagestan State Technical University Technical Sciences ◽

10.21822/2073-6185-2021-48-3-106-116 ◽

2021 ◽

Vol 48 (3) ◽

pp. 106-116

Author(s):

M. Sh. Salamanova ◽

Z. Kh. Ismailova

Keyword(s):

Portland Cement ◽

Construction Industry ◽

Cement Industry ◽

Cement Clinker ◽

Cement Stone ◽

Portland Cement Clinker ◽

Cement Binder ◽

Alkaline Activator ◽

Effective Use ◽

Calcium Hydrosilicate

Objective. Issues related to the search for new, less energy- and material- intensive binders have long been on the agenda of many world environmental forums, since the carbonate technology of Portland cement entails pollution of the surrounding atmosphere and habitat, and the price of this product is unjustifiably growing. In our opinion, alkaline cements could contribute to the construction industry. Within the framework of this work, research results have been obtained that confirm the effectiveness of the development of a clinker-free technology for producing alkaline-mixed binders and composites based on them using aluminosilicate additives, both natural and technogenic origin.Method. The methods of electron microscopy and differential thermal analysis make it possible to study the nature of the components and the processes of formation of the structure of the cement stone. Waste from the cement industry has the appropriate granulometric and chemical composition, the aluminosilicate mineralogy of the studied powders confirms their compliance with the ready-made raw mix of Portland cement clinker, which is the key to the possibility of their effective use.Result. The carried out differential thermal analyzes confirmed the presence of the following phases in the composition of cement stone on binding bonds "cement dust - alkaline activator" of zeolite, calcite, mica type muscovite, montrillonite, magnesium oxide, calcium sulfoaluminates, ettringite structure, calcium hydrochloraluminate, calcium hydrosilicate, calcium hydrosilicate calcium.Conclusion. The obtained regularities of the processes of formation of the structure of the cement binder "waste of the cement industry - Na2SiO3", will transform these developments to create strong and durable artificial building composites competing with concretes on Portland cement.

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