Method for measuring cement mixing amount of red-layer mudstone flow-state solidified soil

Abstract

The invention relates to the technical field of soil solidification construction quality detection, and discloses a red-layer mudstone flow state solidified soil cement mixing amount determination method, which comprises: taking a red-layer mudstone flow state solidified soil mixture sample which is not initially set, and carrying out an EDTA titration test to measure the water content disodium standard solution consumption amount; recording the cement hydration time from feeding, stirring and mixing of the curing agent of the red-layer mudstone flow-state solidified soil to EDTA titration test detection; a drying method is adopted for detecting the red layer mudstone flow state solidified soil mixture sample which is not initially set, and the water content is measured; and establishing a function relation between the consumption of the EDTA disodium standard solution and the cement mixing amount, the water content and the hydration time by adopting a regression orthogonal test, and estimating the cement mixing amount of the red-layer mudstone flow state solidified soil. According to the method, the cement blending amount of the red mudstone flow state solidified soil in the pouring construction process is rapidly estimated, the step of making a standard curve is omitted, and the detection efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of soil solidification construction quality detection, and in particular to a method for determining cement content of red mudstone fluidized solidified soil. Background Art

[0002] The cement content of fluidized solidified soil is the core factor that affects the solidification strength of the soil and reflects the quality of the project. It is also the focus of construction technology and quality inspection. At present, there are many standard methods for determining the cement content in domestic and foreign technical specifications. Among them, the EDTA titration method is the most widely used, with technical advantages such as low detection cost and strong adaptability.

[0003] The EDTA titration method first takes representative raw soil and cement samples from the construction site, prepares fluidized solidified soil mixture samples according to different cement content (%) in the laboratory, conducts EDTA standard titration test, and makes a standard curve of the relationship between the consumption (mL) of disodium standard solution and the cement content (%); then takes representative fluidized solidified soil mixture samples from the construction site, conducts EDTA titration test in the laboratory, and tests the consumption (mL) of disodium standard solution; finally, finds the corresponding cement content (%) in the standard curve, which is the cement content in the fluidized solidified soil at the construction site.

[0004] The test data of the EDTA standard titration test is affected by many factors, mainly the mixing amount of cement and water and the cement hydration time. However, the EDTA titration test in the current test procedure only focuses on the influence of cement content (%), and fails to reflect the influence of factors such as water content and cement hydration time on the test results. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, the present invention provides a method for determining the cement content of red mudstone fluidized solidified soil. The method takes into account the influence of water content and hydration time on the test data of EDTA titration method, and establishes a functional relationship between the consumption of disodium EDTA standard solution and the cement content, water content and hydration time through regression orthogonal test, so as to realize rapid estimation of the cement content of red mudstone fluidized solidified soil during the pouring construction process, eliminate the step of making a standard curve, improve the detection efficiency, and provide a more reliable and accurate technical guarantee for the quality detection of fluidized solidified soil engineering construction.

[0006] In order to achieve the above-mentioned object of the invention, the technical solution adopted by the present invention is:

[0007] A method for determining the cement content of red mudstone fluidized solidified soil comprises the following steps:

[0008] Take the sample of the fluidized solidified soil mixture of the red mudstone that has not initially set to conduct the EDTA titration test, and measure the consumption of the standard solution of disodium standard solution for water content;

[0009] Record the cement hydration time from the mixing of the curing agent for the red mudstone fluidized solidified soil to the EDTA titration test;

[0010] The drying method was used to test the samples of the fluidized solidified soil mixture of the red mudstone that had not initially set, and the water content was measured;

[0011] The functional relationship between the consumption of disodium EDTA standard solution and cement content, water content and hydration time was established by regression orthogonal test to estimate the cement content of red mudstone flow-stabilized soil.

[0012] In one possible implementation, the red bed mudstone fluidized solidified soil mixture includes raw soil, a solidifying agent and mixing water.

[0013] In one possible implementation mode, the raw soil is fully weathered to weakly weathered red layer soft rock, and the liquid limit of fine particles after water disintegration is no more than 42%; the curing agent is P·O42.5 ordinary Portland cement; and the mixing water is engineering water for the construction site.

[0014] In one possible implementation manner, the cement content in the red bed mudstone fluidized solidified soil mixture is the ratio of the cement mass to the dry mass of the raw soil.

[0015] In one possible implementation manner, the ratio of the cement mass to the dry mass of the raw soil is not less than 5% and not more than 15%.

[0016] In one possible implementation, when an EDTA titration test is performed, the red bed mudstone fluidized solidified soil mixture has not initially set, and the cement hydration time does not exceed 210 minutes.

[0017] In one possible implementation, the water content of the red mudstone fluidized solidified soil mixture is the ratio of the mass of water to the sum of the dry mass of the raw soil and the mass of cement.

[0018] In one possible implementation, the ratio of the mass of water to the sum of the dry mass of the raw soil and the mass of cement is not less than the liquid limit of the raw soil and not greater than 1.5 times the liquid limit of the raw soil.

[0019] In one embodiment, a functional relationship between the consumption of disodium EDTA standard solution and cement content, water content and hydration time is established by using a regression orthogonal test:

[0020] P=1.075C-0.184W-0.00625T+13.085

[0021] Wherein, P is the consumption of disodium standard solution, mL; C is the cement content, %; W is the water content, %; T is the hydration time, min.

[0022] The present invention has the following beneficial effects:

[0023] The present invention directly establishes a functional relationship between the consumption of disodium EDTA standard solution and the cement content, water content and hydration time with a small test amount through a regression orthogonal test. On the basis of the existing EDTA standard titration method test which only considers the influence of the cement content factor on the detection value, the present invention further considers the influence of factors such as the fluctuation of the mixing water content of fluidized solidified soil construction and the delay of detection time, so that more factors are reflected and the detection accuracy is higher. At the same time, the complicated test and data processing work of making a standard curve and considering the influence of multiple factors are eliminated, the detection process is more compact, the detection analysis is clearer and the detection efficiency is faster. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The figure is a flow chart of a method for determining the cement content of red mudstone fluidized solidified soil. DETAILED DESCRIPTION

[0025] The specific implementation modes of the present invention are described below so that those skilled in the art can understand the present invention. However, it should be clear that the present invention is not limited to the scope of the specific implementation modes. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the attached claims, these changes are obvious, and all inventions and creations utilizing the concept of the present invention are protected.

[0026] The EDTA titration method in the current specification only considers the influence of cement content on the consumption of disodium EDTA standard solution. When used for cement content detection of fluidized solidified soil at the construction site, it cannot reflect the influence of factors such as the fluctuation of the moisture content of the mixture and the delay of the detection time on the consumption of disodium EDTA standard solution, resulting in a large deviation in the cement content detection value. Therefore, the present invention proposes a rapid estimation method for the cement content of fluidized solidified soil of red mudstone. Through regression orthogonal test, a functional relationship between the consumption of disodium EDTA standard solution and cement content, moisture content and hydration time is directly established with a small test amount. On the basis of the existing EDTA standard titration method test which only considers the influence of cement content factors on the detection value, the influence of factors such as the fluctuation of the moisture content of the fluidized solidified soil construction mixture and the delay of the detection time are further considered, and more factors are reflected, and the detection accuracy is higher; at the same time, the complicated test and data processing work of making standard curves and considering the influence of multiple factors are eliminated, and the detection process is more compact, the detection analysis is clearer, and the detection efficiency is faster.

[0027] like Figure 1As shown, a method for determining the cement content of red mudstone fluidized solidified soil provided by an embodiment of the present invention comprises the following steps S1 to S4:

[0028] S1. Take a sample of the fluidized solidified soil mixture of red mudstone that has not initially set and conduct an EDTA titration test to measure the water content of the disodium standard solution consumption;

[0029] S2. Record the cement hydration time from the time when the curing agent of the red mudstone fluidized solidified soil is added, stirred and mixed to the time when the EDTA titration test is performed;

[0030] S3. Using a drying method, the sample of the fluidized solidified soil mixture of the red mudstone that has not initially set is tested to measure the water content;

[0031] S4. Regression orthogonal test is used to establish the functional relationship between the consumption of disodium EDTA standard solution and cement content, water content and hydration time, and to estimate the cement content of red mudstone flow-stabilized soil.

[0032] In an optional embodiment of the present invention, the fluidized solidified soil is prepared using red mudstone raw material soil. The raw material soil is a strongly weathered soft rock, which is air-dried and crushed and then passed through a 5mm sieve. The particle specific gravity is 2.70, the liquid limit and plastic limit are 32% and 17% respectively, and the maximum dry density of heavy compaction is 1.98g / cm 3 , the optimal moisture content is 10.02%; the curing agent is P·O42.5 ordinary Portland cement; the mixing water is the construction site engineering water

[0033] In an optional embodiment of the present invention, the red mudstone fluidized solidified soil mixture of this embodiment includes raw soil, a solidifying agent and mixing water. The raw soil is fully weathered to weakly weathered red soft rock, and the liquid limit of fine particles after water disintegration is not more than 42%; the solidifying agent is P·O42.5 ordinary Portland cement; and the mixing water is construction site engineering water. Specifically, the raw soil is strongly weathered red soft rock, and the liquid limit of fine particles after water disintegration is 32%, which is lower than 42%; the solidifying agent is P·O42.5 ordinary Portland cement; and the mixing water is construction site engineering water.

[0034] In an optional embodiment of the present invention, the cement content in the red mudstone fluidized solidified soil mixture of the present embodiment is the ratio of the cement mass to the dry mass of the raw material soil, and the ratio of the cement mass to the dry mass of the raw material soil is not less than 5% and not more than 15%. Specifically, the cement content C (%) in the red mudstone fluidized solidified soil is between 7% and 13%, higher than 5 (%) and lower than 15 (%).

[0035] In an optional embodiment of the present invention, when the EDTA titration test is performed, the red mudstone fluidized solidified soil mixture does not initially set, and the cement hydration time does not exceed 210 minutes. Specifically, the cement hydration time in the red mudstone fluidized solidified soil is between 90 (min) and 210 (min), the mixture has good fluidity, and the cement hydration time T (min) does not exceed 210 (min).

[0036] In an optional embodiment of the present invention, the water content of the fluidized solidified soil mixture of the red mudstone in this embodiment is the ratio of the mass of water to the sum of the dry mass of the raw soil and the mass of cement, and the ratio of the mass of water to the sum of the dry mass of the raw soil and the mass of cement is not less than the liquid limit of the raw soil and not greater than 1.5 times the liquid limit of the raw soil. Specifically, the water content W (%) of the fluidized solidified soil mixture of the red mudstone is in the range of 40% to 48%, which is 32% higher than the liquid limit of the red mudstone raw soil and does not exceed 48% of the 1.5 times liquid limit.

[0037] In an optional embodiment of the present invention, this embodiment adopts the regression orthogonal test method to obtain 11 combinations of three factors and three levels of cement content C (%), water content W (%), and cement hydration time T (min), and the EDTA titration test is used to measure the disodium standard solution consumption P (mL), a total of 11 groups of test data are shown in Table 1.

[0038] Table 1

[0039]

[0040] The functional relationship between the consumption of disodium EDTA standard solution and cement dosage, water content and hydration time is established as follows:

[0041] P=1.075C-0.184W-0.00625T+13.085

[0042] Wherein, P is the consumption of disodium standard solution, mL; C is the cement content, %; W is the water content, %; T is the hydration time, min.

[0043] The method for determining the cement content of red mudstone fluidized solidified soil proposed in the present invention is analyzed in combination with specific experimental verification.

[0044] The present invention samples the fluidized solidified soil of red mudstone with an actual cement content of 10 (%) at the construction site, performs an EDTA titration test, obtains the disodium standard solution consumption P=13.810 (mL), and simultaneously uses a drying method to measure the water content W of the mixture sample to be 48 (%), and the cement hydration time T to the EDTA titration test is 150 (min); from the relationship P=1.075C-0.184W-0.00625T+13.085, the cement content C=(13.810+0.184×48+0.00625×150-13.085) / 1.075=9.76 (%); while the traditional standard test The test method does not take into account the influence of the moisture content fluctuation of the construction mixture (the measured moisture content W=48(%), which is about 4% higher than the designed moisture content) and the delay of the detection time (the cement hydration time T in the EDTA titration test is 150(min), which is about 145min delayed compared with the EDTA standard titration test). According to the standard curve equation of the EDTA titration test P=1.090C+4.870, the cement content is 8.20(%). It can be seen that the estimated value of the method of the present invention deviates from the actual cement content of 10(%) by only 0.24(%), which is significantly smaller than the deviation of 1.80(%) of the traditional method. The detection accuracy of the invented rapid estimation method is greatly improved compared with the traditional method.

[0045] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0046] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0047] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0048] The present invention uses specific embodiments to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

[0049] Those skilled in the art will appreciate that the embodiments described herein are intended to help readers understand the principles of the present invention, and should be understood that the protection scope of the present invention is not limited to such specific statements and embodiments. Those skilled in the art can make various other specific variations and combinations that do not deviate from the essence of the present invention based on the technical revelations disclosed by the present invention, and these variations and combinations are still within the protection scope of the present invention.

Claims

1. A method for determining the cement content of red mudstone fluidized solidified soil, characterized in that: The following steps are involved: Take the sample of the fluidized solidified soil mixture of the red mudstone that has not initially set to conduct the EDTA titration test, and measure the consumption of the standard solution of disodium standard solution for water content; Record the cement hydration time from the mixing of the curing agent for the red mudstone fluidized solidified soil to the EDTA titration test; The drying method was used to test the samples of the fluidized solidified soil mixture of the red mudstone that had not initially set, and the water content was measured; The functional relationship between the consumption of disodium EDTA standard solution and cement content, water content and hydration time was established by regression orthogonal test to estimate the cement content of red mudstone flow-stabilized soil.

2. The method for determining the cement content of red mudstone fluidized solidified soil according to claim 1, characterized in that: The red bed mudstone fluidized solidified soil mixture comprises raw soil, a solidifying agent and mixing water.

3. The method for determining the cement content of red mudstone fluidized solidified soil according to claim 2, characterized in that: The raw soil is fully weathered to weakly weathered red layer soft rock, and the liquid limit of fine particles after water disintegration is not more than 42%; the curing agent is P·O42.5 ordinary Portland cement; the mixing water is the engineering water used in the construction site.

4. The method for determining the cement content of red mudstone fluidized solidified soil according to claim 1, characterized in that: The cement content in the red-bed mudstone fluidized solidified soil mixture is the ratio of the cement mass to the dry mass of the raw soil.

5. The method for determining the cement content of red mudstone fluidized solidified soil according to claim 4, characterized in that: The ratio of cement mass to dry mass of raw soil shall not be less than 5% and not more than 15%.

6. The method for determining the cement content of red mudstone fluidized solidified soil according to claim 1, characterized in that: When the EDTA titration test was conducted, the red-bed mudstone fluidized solidified soil mixture had not initially set and the cement hydration time did not exceed 210 minutes.

7. The method for determining the cement content of red mudstone fluidized solidified soil according to claim 1, characterized in that: The moisture content of the red mudstone fluidized solidified soil mixture is the ratio of the mass of water to the sum of the dry mass of the raw soil and the mass of cement.

8. The method for determining the cement content of red mudstone fluidized solidified soil according to claim 7, characterized in that: The ratio of the mass of water to the sum of the dry mass of raw soil and the mass of cement shall not be less than the liquid limit of raw soil and shall not be greater than 1.5 times the liquid limit of raw soil.

9. The method for determining the cement content of red mudstone fluidized solidified soil according to claim 1, characterized in that: The functional relationship between the consumption of disodium EDTA standard solution and cement content, water content and hydration time was established by regression orthogonal test: P=1.075C-0.184W-0.00625T+13.085 Among them, P is the consumption of disodium standard solution; C is the cement content; W is the water content; T is the hydration time.

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