Patent ID: 11883982
Assignee: SHENZHEN UNIVERSITY
Field: Measurement (Instruments)
Classification: CPC B  G  C  Y | IPC B  C

Claim 0:
1. A method for compression casting concrete to reduce an amount of cement, comprising the following steps:
mixing concrete raw materials according to any existing concrete mix proportion designed to meet a specific performance requirement, the concrete mix proportion comprising at least water and a cement;
pouring the concrete obtained by the mixing into a mould, and compressing the concrete in the mould using a compression device at a set pressure, such that the concrete is compacted and excess cement paste is extruded;
gradually reducing the amount of the cement in the concrete mix proportion while keeping amounts of other materials unchanged since the performance of the compression cast concrete exceeds an original performance index, and obtaining a new mix proportion each time the amount of the cement is reduced; and de-moulding the compression cast concrete obtained at each new mix proportion and curing for 28 days, and carrying out a compressive strength axial compression test to evaluate a relationship between cement reduction and strength, wherein the 28-day strength of the compression cast concrete obtained at the new mix proportion is gradually reduced until the performance of the concrete is reduced to meet a design index, and a mix proportion at this time is obtained as a mediate mix proportion;
proportionally reducing amounts of the water and the cement in the mediate mix proportion while keeping amounts of other materials unchanged, and compressing and casting concrete of a new formula obtained each time the amounts of water and cement in the mediate mix proportion are reduced proportionally, wherein during compression of the concrete of the new formula, discharge of cement paste is gradually reduced until there is no cement slurry discharged after the compression; and at this time, the amount of cement is a minimum amount of cement in formulas of the compression cast concrete meeting a performance index, and the mix proportion is used as a final mix proportion of the compression cast concrete; and
compression casting a concrete member according to the final mix proportion.