THE EFFECT OF COMPLEX ADDITIVES ON THE HEAT OF CEMENT HYDRATION AND CONCRETE HARDENING PROCESSES
Zhilkibayeva A. Yestemessova A. Rakhimov Y. Zhakipbekov S. Makhambetova U.
2022Scibulcom Ltd.
Journal of the Balkan Tribological Association
2022#28Issue 6897 - 911 pp.
Portland cement is a polymineral material. The structure of the hardened cement stone consists of crystalline elements of various sizes and configurations. In ac-cordance with the laws of solid-state physics and probabilistic-statistical theory, the strength of such materials depends on the size of the structural elements, the nature of porosity (in relationship to cement stone) and the strength of contacts between the elements of the solid phase. The purpose of the work is to study the effect of a complex additive consisting of waste from the enrichment of the Balkhash Mining and Metallurgical Combine, microsilica on the heat of hydration and the processes of structure formation of heavy concrete. The influence of a complex additive consisting of microsilica and enrichment waste from the Balkhash Mining and Metallurgical Combine on the processes of hydration and structure formation of cement systems has been studied. It has been experimen-tally proved that the introduction of additives significantly affects the processes, it has been established that the introduction of the superplasticizer ‘MasterRheo-buid 1000 K’ accelerates the beginning of setting of the cement dough. With the introduction of the superplasticizer Glenium 51, the onset of setting occurs after 150 minutes, but by the end of the setting period it significantly reduces the rate of structure formation. In this case, the period from the beginning to the end of setting is 70 minutes, which is 40 minutes less, compared to cement dough without any additives. It was found out that the intensive process of concrete hardening with the release of a large amount of hydration heat in the first structure made of a concrete mixture B 35 with the use of a modified binder MV-20 +1.6% SP ‘Rheobuild 1000 K’ begins after 4 hours and 30 minutes at a temperature of 39.2–40.1°C. In the second structure the binder MV-20 +1.0% SP ‘Glenium 51’ is used, the third stage of the hydration process occurs after 5 hours and 30 minutes. At the same time, the concrete temperature rose to 39.0–40.5°C.
binder composi-tion , complex modifying additive , hydration processes , hydration stages , induction period
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Faculty of Building Technology and Management, Kazakh Leading Academy of Architecture and Civil Engineering, 28 Ryskulbekov Str, Almaty, 050043, Kazakhstan
LTD ‘Alatau Sapa Engineering’, 30A Polezhaeva Str, Almaty, 050000, Kazakhstan
Construction Department, LLP ‘Intereng-Almaty’, 1/1 Nurmakov Str, Almaty, 050026, Kazakhstan
Department of Design and Construction, Baishev University, 302A Bratyev Zhubanovykh Str, Aktobe, 030000, Kazakhstan
Faculty of Building Technology and Management
LTD ‘Alatau Sapa Engineering’
Construction Department
Department of Design and Construction
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