Slow-setting cement for highway roadbeds

Abstract

The invention discloses slow-setting cement for highway roadbeds, which is prepared from the following raw materials in parts by weight: 53 to 60 parts of clinker, 3 to 5 parts of desulfurized gypsum, 1 to 6 parts of desulfurized ash, 15 to 20 parts of limestone, 15 to 25 parts of fly ash, and 0.04 to 0.1 part of slow-setting agent. The clinker mainly contains the following ingredients in percentage by weight: 54 to 62 percent of tricalcium silicate, 15 to 20 percent of dicalcium silicate, 6.7 to l8.7 percent of tricalcium aluminate, and 11 to 13 percent of tetracalcium aluminoferrite. The slow-setting cement provided by the invention is characterized in that: the initial setting time is increased to more than 4 hours, and the final setting time is increased to more than 6 hours; the bending strength (3 days) is more than or equal to 3.6 Mpa, and the compressive strength (3 days) is more than or equal to 17.2 Mpa; the bending strength (28 days) is more than or equal to 6.6 Mpa, and the compressive strength (28 days) is more than or equal to 37.4 Mpa; the performance is better than that of other cement products of the same strength grade and meets the construction requirements for highway roadbeds; and the market prospects are good and the social benefits are increased.

Description

technical field [0001] The invention belongs to the technical field of cement, and in particular, the invention relates to a slow-setting cement for expressway subgrades. Background technique [0002] With the rapid development of transportation modernization, the construction of expressways has achieved world-renowned achievements. According to the nature of the project, the new type of traffic construction materials - highway subgrade ecological slow-setting cement has increased the technological content of products and broadened the market. , so that the competitiveness of products and the economic benefits of enterprises have been greatly improved. At present, the production of retarded cement in China is mainly based on the construction requirements and technical requirements of road construction. Most of them are retarded cement products, and the initial setting time is more than 3 hours. Composite portland retarded cement used for expressways usually requires that th...

AI Technical Summary

Problems solved by technology

Composite portland retarded cement used for expressways usually requires that the properties of the cement not only meet the requirements of the national standard GB175-2007, but also meet the initial setting time of more than 4 hours and the final setting time of more than 6 hours. Under the current situation, it is difficult for the products of cement enterprises to meet such technical requirements.

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