Method for rapidly and simply measuring cement content of cement soil

Abstract

The invention discloses a method for rapidly and simply measuring the cement content of cement soil. The method comprises the following steps that: stirred cement slurry is taken at a construction field and brought back to a laboratory to be sealed and stored inside a soil package; after reaching certain period, on-site core sampling is carried out on a cement stirring column, a high pressure rotary spraying stake and the like at the construction field, a core sample is sealed and brought back to the laboratory, and simultaneously the air exhaust saturation is carried out on the cement slurry sample stored in the laboratory and the core sample taken back from the on-site core sampling; the mass, the volume, the density and the moisture content of each testing sample are tested; the mass of a cement hydration product is calculated according to the fact that the saturated cement soil is composed of three parts, i.e., soil grains, the cement hydration product and free water, and according to a density equation and a volume equation of a saturated cement soil core sample; and the quantity of mixed cement is calculated so as to obtain a cement mixing ratio. The detecting method has the advantages of being easy and reliable in operation and high in operability / of great easiness, high reliability and high operability and the like, and has a wide application prospect.

Description

technical field [0001] The invention relates to a quick and simple detection method for the cement content of cement soil, which is a detection method for the cement mixing amount of cement mixing piles, high-pressure rotary grouting piles and the like. The invention makes up for the technical gap that cannot be quickly detected for cement content at present, and the detection method is simple and reliable, the detection period is short, and time and economic cost are saved, and it belongs to the technical field of underground engineering. Background technique [0002] A large number of foundation pit excavation, subway tunnel excavation, high-rise building foundation reinforcement, expressway roadbed reinforcement, etc. in a large number of underground projects require grouting reinforcement for the foundation. However, due to the concealment of underground projects and the lack of detection methods, construction units often adopt the method of cutting corners to deal with ...

AI Technical Summary

Problems solved by technology

However, due to the concealment of underground projects and the lack of detection methods, construction units often adopt the method of cutting corners to deal with it, which makes many underground projects in our country have huge safety hazards, and even major safety accidents such as the superstructure tilting due to low strength often occur.

In engineering practice, at present, the strength of cement soil is basically measured by coring to indirectly reflect the construction quality of foundation reinforcement. There are many factors affecting the strength. Even if the strength of cement soil does not meet the design requirements, it is impossible to judge the construction quality. Whether the unit has the problem of cutting corners and materials, and cannot directly supervise the construction unit