Mass concrete and preparation process thereof

Abstract

The invention discloses mass concrete and a preparation process thereof. The mass concrete comprises 230-235 parts by weight of cement, 110-120 parts by weight of fly ash, 160-165 parts by weight of water, 75-80 parts by weight of mineral powder, 850-860 parts by weight of medium sand, 735-740 parts by weight of broken stones with a respective particle size of 5-25 mm, 220-225 parts by weight of broken stones with a respective particle size of 5-10 mm, 1-1.5 parts by weight of a modifying agent, 0.001-0.005 part by weight of a retarder and 7-7.8 parts by weight of a water reducing agent. The mass concrete and the preparation process thereof disclosed by the invention have the beneficial effects that through the addition of the fly ash and the mineral powder, the adding amount of the cementis reduced, and the heat release of the cement in the hydration process is reduced; meanwhile, the added modifying agent selects copolymer methacrylic acid and copolymerized isoprene polyoxyethyleneether capable of being complexed with the cement or the water reducing agent, so that the degree of hydration of the cement can be changed, the cement hydration peak is delayed, and the staggered peakhydration can be performed during use in the mass concrete. Through integrally selecting the above components, not only is the heat release in the hydration process of the cement reduced, but also the cement hydration peak is delayed, so that the temperature contraction affected by a sharp temperature change is avoided, and further the cracking phenomenon of the mass concrete is avoided.

Description

technical field [0001] The invention relates to the field of concrete, in particular to a large-volume concrete and a preparation process thereof. Background technique [0002] With the development of high-speed railways, important requirements are put forward for the design and construction of bridge structures. The design of bridges is closely related to the development of our science and technology and the society's emphasis on industrial technology. For the further strengthening of large-area building concrete construction in modern society, we have a good understanding of the composition of concrete materials and the phenomenon of heat of hydration in the construction process. All of them have been analyzed and applied to a certain extent. The remarkable feature of the cap structure of the span bridge is the large size of the structure and the increase in the amount of concrete. [0003] However, in practical applications, large-volume concrete will generate a large am...

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Problems solved by technology

[0003] However, in practical applications, large-volume concrete will generate a large amount of heat during the heat of hydration stage when the strength increases. Due to the poor heat transfer performance of concrete, the internal hydration heat is not easy to dissipate, which will form a temperature gradient on the cross-section and the outer layer of concrete. The temperature difference of the surrounding environment will cause large temperature deformation of the concrete and the temperature stress will lead to the occurrence of cracks

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