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Method for determining lime mixing amount ratio in expansive soil

A method for determining and expansive soil technology, applied in roads, roads, buildings, etc., can solve the problems of lime-stabilized soil mechanical indicators and water stability decline, and achieve significant improvement effects, simple application, and strong operability

Inactive Publication Date: 2021-01-05
ROAD & BRIDGE INT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main purpose of this application is to provide a method for determining the lime content ratio in expansive soil, so as to solve the problem of improving the expansive soil through lime in the related art. When the lime measurement exceeds a certain value, the mechanical index and water stability of the lime-stabilized soil falling problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A method for determining the lime content ratio in expansive soil, comprising the following steps:

[0033] S1. The viscous and agglomerated expansive soil in the borrow pit is mechanically crushed, and after repeated mixing, no soil clods larger than 5cm are achieved. At the same time, lime requires grade III or above quicklime, and calcareous quicklime has effective CaO, The content of MgO should not be less than 70%;

[0034] S2, according to the water content of construction control, prepare EDTA standard titration schedule line, to determine the ash dose of lime-stabilized expansive soil;

[0035]Specifically, the heavy-duty compaction standard of lime-stabilized expansive soil has been obtained through experiments. The variability of dry weight index is low, and the value is lower than that of expansive soil. The amount of water decreases, and decreases slightly with the increase of lime metering, so the mechanical properties improved by using lime far exceed the...

Embodiment 2

[0049] A method for determining the lime content ratio in expansive soil, comprising the following steps:

[0050] S1. The viscous and agglomerated expansive soil in the borrow pit is mechanically crushed, and after repeated mixing, no soil clods larger than 5cm are achieved. At the same time, lime requires grade III or above quicklime, and calcareous quicklime has effective CaO, The content of MgO should not be less than 70%;

[0051] S2, according to the water content of construction control, prepare EDTA standard titration schedule line, to determine the ash dose of lime-stabilized expansive soil;

[0052] Specifically, the heavy-duty compaction standard of lime-stabilized expansive soil has been obtained through experiments. The variability of dry weight index is low, and the value is lower than that of expansive soil. The amount of water decreases, and decreases slightly with the increase of lime metering, so the mechanical properties improved by using lime far exceed th...

Embodiment 3

[0066] A method for determining the lime content ratio in expansive soil, comprising the following steps:

[0067] S1. The viscous and agglomerated expansive soil in the borrow pit is mechanically crushed, and after repeated mixing, no soil clods larger than 5cm are achieved. At the same time, lime requires grade III or above quicklime, and calcareous quicklime has effective CaO, The content of MgO should not be less than 70%;

[0068] S2, according to the water content of construction control, prepare EDTA standard titration schedule line, to determine the ash dose of lime-stabilized expansive soil;

[0069]Specifically, the heavy-duty compaction standard of lime-stabilized expansive soil has been obtained through experiments. The variability of dry weight index is low, and the value is lower than that of expansive soil. The amount of water decreases, and decreases slightly with the increase of lime metering, so the mechanical properties improved by using lime far exceed the...

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PUM

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Abstract

The invention discloses a method for determining a lime mixing amount ratio in expansive soil, relates to the technical field of civil engineering, and aims at solving the problems that in the relatedart, the expansive soil is improved through the lime, and after lime metering exceeds a certain value, the mechanical index and the water stability of the lime stabilized soil are reduced, and the method comprises the following steps that S1, taking the expansive soil and the lime; S2, preparing an EDTA standard titer line according to the water content controlled by construction; S3, taking 3-6%of lime, and uniformly mixing with the lime to obtain a mixed soil sample; S4, culturing bacillus megaterium liquid and preparing cementing liquid; S5, adding diluted 60-80% bacillus megaterium liquid into the mixed soil sample, uniformly stirring, and standing for 2 hours; S6, after 2 hours, sucking out the bacillus megatherium liquid, adding 60-80% of cementing liquid, continuing to solidify, uniformly stirring, and standing for 22 hours; and S7, sucking out the bacillus megaterium liquid and the cementing liquid, and repeating the steps S4 and S5 seven times.

Description

technical field [0001] The present application relates to the technical field of civil engineering, in particular to a method for determining the lime content ratio in expansive soil. Background technique [0002] Expansive soil contains hydrophilic minerals montmorillonite and illite, which have the characteristics of significant water absorption, water loss shrinkage, and repeated expansion and contraction deformation in the external environment of alternating dry and wet conditions, which often cause severe damage to engineering structures and roadbeds. Therefore, it is necessary to improve the expansive soil to reduce the expansion and contraction. [0003] Now it is usually treated by mixing lime and cement in the expansive soil filler. The improved working mechanism is generally believed to be: one is ion exchange, that is, calcium and magnesium ions in lime replace sodium and potassium ions in soil, or absorption, lead to an increase in ion unit weight. After the ex...

Claims

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Application Information

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IPC IPC(8): E01C3/04
CPCE01C3/04
Inventor 闫永杰何艳龙钟凯赵永旭韩继春
Owner ROAD & BRIDGE INT
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