Cyclic Strength of Concretes of a New Generation

For today various types of concrete, including high-strength and self-compacting have been developed in Russia and abroad. High results of strength and other properties were obtained on powder-activated sand concretes of a new generation – plasticized concretes with an increased content of suspension component. To date, the technological physical and mechanical properties of powder-activated concretes depending on the main structure-forming factors have been studied. The present research is devoted to establishing the stability of powder-activated concretes of a new generation under the action of cyclic loads. Comparison of the results was carried out with concretes of a transitional generation. Short-term load tests were conducted on a specially made stand. Loading was carried out in series of 100 load applications. According to the data obtained, curves of low-cyclic fatigue of concretes were built, which were approximated using a fractional-exponential function. The results were processed by the linear correlation method. It is established that the criterion of low-cyclic stability is the coefficient of endurance, showing the term of preserved strength (bearing capacity) after repeated and repeatedly applied loads. The advantages of powder-activated concretes are established. For these compositions, the values of low-cycle and multi-cycle fatigue on the basis of 5·10⁶ cycles – K_b,pul = 0,83R_b, on the basis of 2·10⁶ cycles K_b,pul = 0,4R_b.

V.I. TRAVUSH¹, Doctor of Sciences (Engineering), Professor, Academician of RAACS,
N.I. KARPENKO¹, Doctor of Sciences (Engineering), Professor, Academician of RAACS;
V.T. EROFEEV², Doctor of Sciences (Engineering), Academician of RAACS,
I.V. EROFEEVA², Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.);
B.A. BONDAREV³, Doctor of Sciences (Engineering),
A.B. BONDAREV³, Candidate of Sciences (Engineering)

¹ Russian Academy of Architecture of Construction Sciences (24, Bolshaya Dmitrovka Street, Moscow, 107031, Russian Federation)
² National Research N.P. Ogarev Mordovia State University (68, Bolshevistskaya Street, Saransk, Republic of Mordovia, 30005, Russian Federation)
³ Lipetsk State Technical University (30, Moskovskaya Street, Lipetsk, 398600, Russian Federation)

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