Micro-expansion moderate heat portland cement and preparation method thereof

Abstract

The invention relates to micro-expansion moderate heat portland cement and a preparation method thereof and belongs to the technical field of dry method cement manufacturing. The micro-expansion moderate heat portland cement is prepared from the following components in parts by weight: 78-83 parts of clinker, 4-6 parts of limestone, 6-8 parts of mineral powder and 5-8 parts of desulfurized gypsum, wherein the clinker is prepared from the following raw materials in parts by weight: 85-88 parts of limestone, 6.5-9 parts of sandstone, 4.5-7 parts of alumina red mud and 0.05-1 part of fly ash slag. The preparation method of the micro-expansion moderate heat portland cement comprises the following steps: (1) clinker procedure, namely heating the limestone, the sandstones, the alumina red mud and the fly ash slag which are used as the raw materials in a decomposing furnace, controlling the temperature at 850-880 DEG C, and calcining the raw materials by virtue of a rotary kiln to prepare the clinker; (2) cement procedure, namely mixing the clinker, the limestone, the mineral powder and the desulfurized gypsum, and carrying out cement grinding to prepare the cement. The preparation method is simple in process, the product performance is stable, indexes of linear expansivity, hydration heat and the like accord with the expected requirements, and the micro-expansion moderate heat portland cement can be widely applied to building construction of high-strength buildings with a large volume, highway tunnels, culverts and the like.

Description

technical field [0001] The invention belongs to the technical field of dry-process cement production, in particular to a micro-expansion medium heat portland cement and a preparation method thereof. Background technique [0002] At present, in the cement industry, some cement factories have researched and produced medium-heat Portland cement, such as: Gezhouba Co., Ltd. Cement Factory, Huaxin Cement Co., Ltd., etc., and some cement factories have researched and produced micro-expansion cement, such as Hunan Shimen Special Cement Co., Ltd., China Academy of Building Materials Science, Yunnan Dianxi Cement Company, etc., but the research on the technology with micro-expansion and medium heat characteristics on the basis of ordinary Portland cement is still at a very low stage. In the existing technology, there are (1) the linear expansion rate cannot reach the target value. The main reason is that the hydration rate of periclase is too slow, which fails to achieve the result ...

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Problems solved by technology

The main reason is that the hydration rate of periclase is too slow, which fails to achieve the result of synchronizing with cement hydration, resulting in low expansion rat

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