A kind of marine cement and preparation method thereof

Abstract

The invention provides a marine cement and a preparation method thereof. Marine cement: mixed clinker 58%‑64%, superfine mineral powder 18%‑23%, silica fume 5%‑8%, and vitrified microbeads 8%‑12%; mixed clinker: clinker 68%‑ 78%, gypsum 14%‑17% and fly ash 17%‑22%; clinker: limestone 83%‑87%, iron ore 8%‑12% and clay ore 1%‑5%. The preparation method of marine cement: calcining limestone, iron ore and clay ore to obtain clinker, then adding gypsum and fly ash for grinding to obtain mixed clinker, mixing the mixed clinker with ultrafine mineral powder, silicon powder and vitrified The microbeads are mixed and homogenized to obtain marine cement. Marine cement can effectively reduce the cracks, capillary pores and gel pores of hardened cement-based materials, improve the fluidization effect, strength effect and durability effect of cement paste, and effectively reduce the corrosion from corrosive ions in seawater.

Description

technical field [0001] The invention relates to the field of cement, in particular to a marine cement and a preparation method thereof. Background technique [0002] Marine cement is mainly used in the preparation process of marine concrete and marine mortar and other materials. Concrete made of ordinary Portland cement has poor corrosion resistance, poor durability, and short concrete life due to the large heat release of cement, which is easy to cause cracks, large porosity of cement stone, and strong permeability. [0003] Concrete shrinkage is a phenomenon in which the volume of concrete shrinks after pouring and hardening, which not only reduces the structural strength, but also provides a channel for air and water to enter the concrete, making the concrete prone to carbonation corrosion and corrosion of steel bars in cold regions. Freeze-thaw cycles, which greatly reduce the durability of the concrete, shorten the life of the building. In recent years, high-performan...

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Problems solved by technology

[0004] In order to solve the above problems, methods such as mixing expansion agent and fiber mixing have been used successively on the market, but the use of expansion agent especially requires concrete to be cured with water in the early stage, the conditions are harsh, and there are serious cement adaptability and delayed ettringite formation. In addition, there are difficulties in adjusting the amount of addition. If the amount is too small, the effect will not be achieved. If the amount is too large, the excess part may cause cracks to expand due to expansion. Therefore, the expansion agent is used for There is an uncertainty in the end result

The addition of fiber can only improve the crack resistance of concrete, but does not reduce the shrinkage of concrete. At the same time, the price of fiber is high, and there are compatibility problems with concrete, which greatly limits its promotion.

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