The influence of complex additives on the endurance strength of concrete

1 Shrinkage of cement/sand mortar containing additives. 1 = without additives; 2 = 1.5 % of So; 3 = 0.1 % of WR; 4 = 1 % of SP; 5 = 26 % of additive

2 Swelling kinetics of cement/sand mortar with the additive in a 5 % solution of sodium sulphate: 1 = without additive, 2 = 1.5 % So, 3 = 0.1 % WR, 4 = 1 % SP, 5 = 2.6 % additive

3 Increase in weight due to water absorption of a 28-day cement/sand mortar with additives after setting under normal conditions: 1 = Composition without additives, 2 = 1 % SP, 3 = 0,1 % WR, 4 = 2.6 % complex additive

4 Fracture surfaces of normally set cement paste matrix (x 500)

Damage due to corrosion of concrete in a building component

How does a new and complex additive, consisting of polycarboxylate ether as a water-repellent impregnation and a setting accelerator, effect the durability of concrete? The article discusses the influence of this additive on the shrinkage, swelling and sulphate-resistance of the cement mixture, and on the frost resistance, water resistance and porosity.

At present, issues connected with the development of concrete technology, the problem of quality improvement and the durability and profitability of different types of concrete are being addressed through the use of various chemical additives. The admixing of organic and inorganic compounds in concrete enables wide-ranging modification of its physical and mechanical properties, its structure and constituents, and has a positive effect on the durability of concrete and reinforced concrete [1]. Nowadays, special attention is being paid to the development of complex additives that simultaneously...

TEXT Prof. Dr. Wladimir Isotow, Cand. Tech. Ruslan Ibragimow, Chair of Technology, Organization and Mechanization of Construction, Kasan University for Architecture and Building Industry, Kasan/Russia

Issue 9/2016 KAZAN STATE UNIVERSITY OF ARCHITECTURE AND ENGINEERING

The influence of complex additives on the endurance strength of concrete

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