Method for rapidly and simply measuring cement content of cement soil

A detection method, cement technology, applied in the direction of removing a certain component weighing, measuring device, specific gravity measurement, etc., can solve the concealment and insufficient detection means, the inability to directly supervise the construction unit, underground engineering safety hazards, etc. problems, to effectively supervise and standardize the construction behavior of construction enterprises, to quickly and easily detect methods, and to ensure the effect of quality and safety

Inactive Publication Date: 2012-10-17
HOHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 cem...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A shield tunnel end well in a certain subway is reinforced with three-axis mixing piles. The soil layer where the shield tunnel passes is hard cohesive soil. The cement mixing ratio is strictly controlled at 20% during construction. 1 =100g, M 2 =78.9g, a=M 2 / M 1 =0.789. After 28 days, the mass of the saturated core sample M=805.4g, the mass of water in the core sample M w =355.9g, core sample volume V=475.6cm 3 , the measured density of the core sample ρ=1.693g / cm 3 , into the formula (2) to get the cement mixing ratio is 20.3%, which is very close to the actual mixing amount.

Embodiment 2

[0018] The foundation of a highway is reinforced by jet grouting piles. The reinforcement layer is silty clay. The cement mixing ratio is strictly controlled at 15% during construction. The cement slurry is taken from the site and maintained for 90 days before being pumped and saturated. The M 1 =100g, M 2 =76.9g, a=M 2 / M 1 =0.769. After 90 days, the mass of the core sample M=813.3g, the mass of the water in the core sample M w =260.3g, core sample volume V=464.1cm 3 , the measured density of the core sample ρ=1.753g / cm 3 , into the formula (2) to get the cement slurry mixing ratio of 14.1%, which is close to the actual mixing amount.

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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 ...

Claims

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Application Information

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IPC IPC(8): G01N5/04G01N9/02G01N9/36
Inventor 钟小春赵赫丰土根张福海赵静王慧洁汪海
Owner HOHAI UNIV
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