Abstract
Nowadays, it is acknowledged that the use of mineral additives based on ground slag is one of ways of resource saving and improvement of technical properties of cement composites. Mineral additives with fineness similar to the Portland cement fineness are often used to replace part of Portland cement. Two kinds of ultra-fine ground granulated blast furnace slag that differ in composition and fineness were studied in the paper. Water-reduction due to effect of super plasticizer in slag-Portland cement compositions with amount of slag up to 70% was studied. The results of reduction of binder quantity per 1 kg of chemical admixture due to significant water-reduction are obtained and analysed. Correlations depending on kind, amount and fineness of slags, as well as depending on mineralogical composition of Portland cement were stated. The ultra-fine mineral additives based on ground slag with high specific surface area can be used for significant reduction of compositional binder.
Highlights
The cement production can involve high quantity of mineral additives of various origins since this economize fuel and natural raw materials due to use of by-products [1,2,3,4,5]
One can determine the following factors of positive influence of ultra-fine mineral additives on concrete structure and properties of cement composites that are discussed in the scientific papers: increase of packing density of mineral particles due to the optimum quantity of micro-particles that are place among cement particles [10,11,12,13]; increase of pozzolanic activity of quartz due to its finer grinding [14,15,16]; fast hardening of cement matrix at the initial stage of hydration since micro-additives can serve as crystallization centres [17,18]; increase of plasticizer effect in Portland cement-mineral additives compositions [19,20,21,22]
Water reductions due to effect of superplasticizer in slag-Portland cement compositions with amount of slag up to 70% and quantity of admixture 0.5-1.0% were studied
Summary
The cement production can involve high quantity of mineral additives of various origins since this economize fuel and natural raw materials due to use of by-products [1,2,3,4,5]. Production of cements with high quantity of mineral additives based on slags enable to increase volumes of cement and concrete production as well as to obtain high-performance concrete with low amount of Portland cement per 1 MPa of strength [2,3,6,7,8,9]. One can resolve the following tasks that due to use of superplasticizer: improve workability of fresh concrete [24,25,26], regulate increase of strength at the different ages [2, 15,16,17], reduce Portland cement [2730], increase rheological activity of additives [3,6,12], improve allocation of fibers in concrete structure [29,30]. Superplasticizer amount to gain fresh concrete with equal workability depends on the kind and quantity of ground granulated blast furnace slag (ggbfs) as it was stated in paper [6,15]
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