Special mixed cement for on-site preparation of concrete as well as preparation method and application

A technology for mixing cement and concrete, applied in cement production, etc., can solve problems such as increased cracking risk, lack, and shortage, and achieve the effects of improving homogeneity and quality stability, simplifying the preparation process, and preventing early cracking
CN110482883AActive Publication Date: 2019-11-22程菲 +1
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Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
程菲
Publication Date
2019-11-22

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Abstract

The invention relates to the field of cement and concrete. The invention discloses special mixed cement for on-site preparation of concrete as well as a preparation method and application. Except formixing and grinding cement clinker and other raw materials, the mixed cement is prepared from the following components in percentage by mass: 60%-80% of general Portland cement of the 42.5 grade or above, 3.0%-6.0% of gypsum, 5%-15% of limestone, 2%-29% of an admixture and 0.5%-3.0% of a functional additive. The general Portland cement with the grade of 42.5 or above meets the requirements of GB175, and parameters of the general Portland cement are controlled such that the mass ratio of the micro powder less than or equal to 3 [mu]m is less than or equal to 10%, the one-day compressive strength is less than or equal to 12 MPa, the 3-day compressive strength is more than or equal to 20 MPa, the 28-day compressive strength is more than or equal to 45 MPa, the water consumption of the standard consistency of the cement paste is less than or equal to 28%, the alkali content is less than 0.6% in terms of 0.658 K2O + Na2O, and the chloride ion content is less than 0.06%. The raw materials are wide in source, the mixed cement can be directly used for preparing or premixing concrete on site, no admixture or functional additive needs to be added again, crack resistance, workability and themechanical property of the concrete are improved, and construction operation is simplified.
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Description

technical field

[0001] The invention relates to the technical field of cement and concrete production, in particular to a special mixed cement for on-site preparation of concrete and its preparation method and application. Background technique

[0002] According to the design, construction and acceptance specifications of construction projects, the concrete strength of various parts of common construction projects can be divided into: β‘  general cushion C10-C15; pile concrete generally above C30; foundation beams, slabs, caps, and columns generally C25-C35 ; β‘‘ wall columns are generally C20-C35 (according to the building needs higher strength); β‘’ floors are generally C20-C30; β‘£ other secondary structures are generally C20-C30.

[0003] According to statistics, domestic C15-C30 strength grade concrete accounts for more than 75% of all concrete. In 2018, the largest commercial concrete company in Hunan Province sold 16.5 million cubic meters of commercial concrete, and the weig...

Claims

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