Use of a highly dispersed chalk additive for the production of concrete for transport structures

Abstract

The concretes used for transport infrastructure facilities are exposed to the active impact of corrosive environment; therefore, such concretes face raised demands as for water repellency, frost resistance and corrosion resistance. These properties can be improved due to the use of additives that have a different kind of effect. This research paper gives consideration to the influence of added highly-dispersed chalk on the physical and mechanical properties of concrete, in particular, water repellency and frost resistance. Experimental data show that the doping of highly-dispersed chalk results in a reduced water repellency and an increased frost-resistance of concrete. The basic physical and mechanical properties of concretes depend on the structure with a special particle packing of the matrix in the interlayers between the structure –forming elements of each level. Assumingly, the influence of added highly-dispersedchalk on the water-repellency and frost-resistance of pavement concrete is conditioned by the optimal arrangement of chalk particles (matrix particles) in the interlayers between the cement particles and the filler (structure-forming elements).

Complex Shrinkage-Reducing Additives for Alkali Activated Slag Cement Fine Concrete

“…Substitution of OPC clinker by additives (i.e. zeolite, slag, fly-ash, highly dispersed chalk) ensures increased strength [1,2], corrosion resistance [3], waterproof [4], freeze-thaw resistance [5] while reduction of CO2 emission.…”

Studying the influence of metakaolin on self-healing processes in the contact-zone structure of concretes based on the alkali-activated Portland cement

“…-minimizing the expansion effect is achieved by introducing various active mineral additives to the cement composition. These additives can be both of secondary [17] and volcanic origin (limestone with amorphous silica content [18], zeolites [19], perlite, tuff, etc. [20]).…”

Study of influence of alkaline component type on pH value and properties of alkali activated concretes containing basalt rock

“…Nowadays a question of widening of raw materials base became very sharp [1][2], including materials for cement and concrete production [3][4][5]. Permanent rising of prices on traditional high-quality aggregates leads to the search of chipper ones, but at the same time the less qualified materials [6][7][8]. Between aggregates in this category there is a high possibility to have active grains (active silica) , able to participate in reaction with cement matrix and leading to the problems [12][13][14], some times -technogen accidents [15][16][17].…”