Light cement soil for deep foundation treatment and preparation method thereof

A foundation treatment and cement-soil technology, applied in the field of foundation treatment, can solve the problems of reduced cement-soil compactness, reduced strength, and reduced cement-soil bulk density, and achieve the effects of reduced settlement, increased ultimate bearing capacity, and reduced cracking

Inactive Publication Date: 2019-08-16
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention is aimed at the existing problems, and provides a light cement soil for deep foundation treatment and its preparation method. The foam is introduced into the foam by using a surfactant foaming agent to stir the foam with the cement slurry. , reduce the bulk density of cement soil; at the same time, due to the increase of pores, the compactness and strength of cement soil decrease, and the gelling performance of cement curing agent is improved by adding silica fume and metakaolin, thereby improving the strength of light cement soil; by adding polycarboxylate The acid increases the fluidity of light cement soil; the stability of the foam is improved by adding a foam stabilizer, so that the foam will not be defoamed under pressure when it is applied to deep foundation treatment. Due to the reduction of self-weight load, cement-soil piles can withstand larger overlying loads than traditional cement-soil piles at the same design strength, and can reduce the settlement caused by self-weight stress, which has great promotion value and can be used in deep foundations. widely used in processing

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  • Light cement soil for deep foundation treatment and preparation method thereof
  • Light cement soil for deep foundation treatment and preparation method thereof
  • Light cement soil for deep foundation treatment and preparation method thereof

Examples

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Embodiment 1

[0030] A method for preparing light cement soil for deep foundation treatment, comprising the following steps:

[0031] (1) Surfactant type foaming agent is assisted to add cellulose foam stabilizer, diluted 80 times with water, add sodium lauryl sulfate and slowly stir more than 20s, the blending amount of described foam stabilizer is 1%-2%, the doping amount of the sodium lauryl sulfate is 0.1%-0.2%;

[0032] (2) Add the mixed solution after step (1) into the foaming machine, put the nozzle of the water inlet pipe of the foaming machine below the liquid level of the foaming agent, and put the nozzle of the return pipe together, and then adjust the foaming Adjust the foaming pressure knob of the foaming machine to the appropriate position, hold the foaming outlet of the foaming machine firmly with one hand, and align the foaming port with the foam container, turn on the switch of the foaming machine with the other hand, start foaming, and pass the surfactant A large amount o...

Embodiment 2

[0037] A light cement soil for deep foundation treatment, comprising the following components by mass ratio:

[0038]

[0039] Cement-soil materials are commonly used in foundation treatment in the amount of cement (the ratio of cement mass to dry soil mass) of 25%-35%, and the appropriate amount of metakaolin and silica fume are used as components of cement-based curing agents 5% and 2%, respectively, because too much or too little metakaolin content can not effectively improve the strength of cement soil, and when the content of silica fume is above 2%, the effect of improving the strength of cement soil will be greatly weakened. The foam mixing amount (defined as the ratio of foam mass to dry soil mass) is between 5% and 10%, because more than 10% foam mixing will make the density of light cement soil less than that of water, so it cannot be applied in Under ground treatment. When the amount of polycarboxylate is 1%, the fluidity of light cement soil can meet the constr...

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Abstract

The invention discloses light cement soil for deep foundation treatment and a preparation method thereof. Foam and cement slurry are mixed in a stirring manner by using a surfactant foaming agent forfoaming treatment to introduce the foam, so that the volume weight of the cement soil is reduced. Meanwhile, due to the increase of the pores, the compactness and strength of the cement soil are reduced; by adding silicon powder and metakaolin, the cementing performance of the cement curing agent is improved, so that the strength of the light cement soil is improved; the fluidity of the light cement soil is improved by adding polycarboxylic acid; the stability of foam is improved by adding the foam stabilizer, so that the product is prevented from defoaming under pressure when being applied todeep foundation treatment, the cement soil meets the requirements of strength, volume weight and fluidity in practical engineering, and the research and development of a light cement soil material are realized.

Description

technical field [0001] The invention belongs to the technical field of foundation treatment in transportation engineering and civil engineering, and in particular relates to light cement soil for deep foundation treatment and a preparation method thereof. Background technique [0002] In recent years, with the rapid economic development of my country's coastal areas, the number of transportation infrastructure construction projects has also increased. Due to the long coastline in my country, complex hydrogeological conditions, and deep soft foundations, it is often necessary to carry out in-depth treatment of the foundation during construction to ensure the safety factor of the project and reduce problems during the operation period. Cement-soil materials have been widely used in foundation treatment because of their low price and wide applicability. [0003] In recent years, many scholars have made in-depth research on the composition and proportion of cement-soil material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B111/40
CPCC04B28/00C04B2111/40C04B2111/00732C04B14/361C04B14/106C04B18/146C04B24/24C04B24/16C04B2103/40
Inventor 邓永锋江乃平赵振平
Owner SOUTHEAST UNIV
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