A rapid detection method for water content of super large particle size cement stabilized macadam

Abstract

The application discloses a kind of super large particle size cement stabilized macadam moisture content rapid detection method, comprising: according to actual use cement dosage in laboratory mixes different moisture contents of cement stabilized macadam mixture;Different moisture contents of cement stabilized macadam mixture obtained by mixing are sieved, to obtain cement mortar;In laboratory test the moisture content of cement mortar;With the moisture content of cement mortar as abscissa, the moisture content of cement stabilized macadam is ordinate Draw relationship curve, and establish corresponding empirical formula;When construction site or mixing station detects the moisture content of cement stabilized macadam mixture, representative sample is taken and sieved, to obtain cement mortar sample;Take cement mortar sample, test the moisture content of cement mortar sample;The moisture content of cement mortar sample is substituted into empirical formula, and the moisture content of site construction measured cement stabilized macadam can be obtained.The application of a kind of super large particle size cement stabilized macadam moisture content rapid detection method solves the problem of poor representativeness of sampling, long moisture content test time and poor precision.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of traffic civil engineering, and particularly relates to a water content rapid detection method for super-large particle size cement stabilized macadam. BACKGROUND

[0002] The water content of cement stabilized macadam is an important index for construction quality control, and accurate detection results reflecting the actual production are key to quality control, and the sampling representativeness (whether consistent with the design mixing ratio) directly affects the detection results.

[0003] At present, the methods for instant determination of the water content of cement stabilized macadam mixture on the construction site are drying method and alcohol method, and these methods have the following problems in determining the water content on the construction site: ① Due to the high content of coarse aggregate in the mixture, the sampling on site is prone to coarse and fine segregation, and the representativeness is poor. If the sample has a high content of coarse aggregate, the water content detection value is small, and vice versa, the detection value is large, which cannot reflect the true value of the water content; ② The water content test on site needs to take more than 2000g of sample using the drying method or the alcohol method, the test time is long, the test precision is poor, and the safety of the alcohol test cannot be guaranteed. These are not conducive to the quality control of the construction process.

[0004] And the super-large particle size cement stabilized macadam refers to the cement stabilized macadam with a nominal maximum particle size of 53mm. Due to the large nominal maximum particle size of coarse aggregate in the mixture and the high content of coarse aggregate, the difficulty of sampling representativeness and the accuracy of testing are increased. SUMMARY

[0005] The purpose of the application is to provide a water content rapid detection method for super-large particle size cement stabilized macadam, which solves the problems of poor sampling representativeness, long water content test time and poor precision.

[0006] In order to achieve the above purpose, the technical solution adopted by the application is: a water content rapid detection method for super-large particle size cement stabilized macadam, which is specifically implemented according to the following steps:

[0007] Step 1, preparing cement stabilized macadam mixtures with different water contents (ω i ) in the laboratory according to the actual use of cement dosage;

[0008] Step 2, sieving the prepared cement stabilized macadam mixtures with different water contents to obtain cement mortar;

[0009] Step 3, testing the water content (ω si ) of the cement mortar in the laboratory;

[0010] Step 4, drawing a relationship curve with the water content (ω si ) of the cement mortar as the horizontal coordinate and the water content (ω i ) of the cement stabilized macadam as the vertical coordinate, and establishing a corresponding empirical formula;

[0011] Step 5, when the construction site or mixing station detects the water content of the cement stabilized gravel mixture, a representative sample is taken and sieved to obtain a cement mortar sample;

[0012] Step 6, the cement mortar sample is taken, and the water content (ω ci ) of the cement mortar sample is tested;

[0013] Step 7, the water content (ω ci ) of the cement mortar sample is substituted into the empirical formula, and the measured water content (ω) of the cement stabilized gravel in the field construction is obtained.

[0014] As a preferred technical solution of the present application, in the step 1, the different water contents are ω opt -1.0%, ω opt , ω opt +1.0%, wherein: ω opt is the optimum water content.

[0015] As a preferred technical solution of the present application, in the step 2 and step 5, the 4.75mm sieve is used.

[0016] As a preferred technical solution of the present application, in the step 3, the drying method or alcohol method is used to test the water content (ω si ) of the cement mortar in the laboratory.

[0017] As a preferred technical solution of the present application, the microwave oven method, drying method or alcohol method is used to test the water content (ω ci ) of the cement mortar sample.

[0018] The present application has the following beneficial effects: the present application is a kind of water content rapid detection method of super large particle size cement stabilized gravel, which avoids sample coarse and fine segregation and poor representation by sieving the cement stabilized gravel through 4.75mm sieve, reduces the test time by reducing the mass of the cement mortar sample used for testing and using the microwave oven method for rapid testing, so as to realize the goal of rapid and accurate testing of the water content of the cement stabilized gravel. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is the water content-water content relationship curve diagram of the cement stabilized gravel of example 1;

[0020] Figure 2 is the water content-water content relationship curve diagram of the cement stabilized gravel of example 2. DETAILED DESCRIPTION

[0021] The technical solutions of the present application will be further described in detail below in combination with the description of the drawings and specific examples.

[0022] The present invention provides a rapid method for detecting the moisture content of ultra-large particle size cement-stabilized crushed stone, which is implemented according to the following steps:

[0023] Step 1: Prepare cement mixtures with different moisture contents (ω) in the laboratory according to the actual cement dosage used. i Cement-stabilized crushed stone mixture; recommended moisture content is ω. opt -1.0%, ω opt ω opt +1.0%, ω opt For optimal moisture content

[0024] Step 2: Pass the cement-stabilized crushed stone mixtures with different moisture contents obtained by mixing through a 4.75mm sieve to obtain cement mortar;

[0025] Step 3: Test the moisture content ω of the cement mortar in the laboratory using either the drying method or the alcohol method. si ;

[0026] Step 4, using the cement mortar moisture content ω si The x-axis represents the moisture content ω of cement-stabilized crushed stone. i Plot the relationship curve for the vertical axis and establish the corresponding empirical formula;

[0027] Step 5: When testing the moisture content of cement-stabilized crushed stone mixture at the construction site or mixing plant, take a representative sample of 3000g and pass it through a 4.75mm sieve to obtain a cement mortar sample.

[0028] Step 6: Take a 300g-500g sample of cement mortar and test its moisture content ω using the microwave oven method. ci If conditions are limited, the drying method or alcohol method can be used to test the moisture content ω of cement mortar samples. ci ;

[0029] Step 7, determine the moisture content ω of the cement mortar sample. ci By substituting into the empirical formula, the moisture content ω of cement-stabilized crushed stone measured on-site can be obtained.

[0030] Example 1

[0031] The present invention provides a rapid method for detecting the moisture content of ultra-large particle size cement-stabilized crushed stone, which is implemented according to the following steps:

[0032] Step 1: Laboratory determination of the optimum moisture content ω of cement-stabilized crushed stone mixture with 4% cement dosage. opt The concentration was 5.0%, therefore, cement-stabilized crushed stone mixtures were prepared in the laboratory at concentrations of 4.0% (ω1), 5.0% (ω2), and 6.0% (ω3).

[0033] Step 2: Pass the cement-stabilized crushed stone mixtures with different moisture contents obtained by mixing through a 4.75mm sieve to obtain cement mortar;

[0034] Step 3: The moisture content of the cement mortar was tested in the laboratory using the drying method and found to be 5.6% (ωs1), 6.6% (ωs2), and 7.8% (ωs3), respectively.

[0035] Step 4, using the cement mortar moisture content ω si Plot a relationship curve with the x-axis representing the horizontal axis and the moisture content ωi of cement-stabilized crushed stone as the y-axis, and establish the corresponding empirical formula (Formula 1), such as... Figure 1 As shown;

[0036] y = 0.91x - 1.04

[0037] R 2 =0.997 (1)

[0038] In the formula: x is the horizontal coordinate, and y is the vertical coordinate;

[0039] Step 5: Take 3000g of cement-stabilized crushed stone mixture sample from the construction site and pass it through a 4.75mm sieve to obtain cement mortar sample;

[0040] Step 6: Take 500g of cement mortar sample and test it using the microwave oven method. The moisture content of the cement mortar sample is 6.9%.

[0041] Step 7, substitute the 7.0% moisture content of the cement mortar sample into the equation. Figure 1 According to the empirical formula, the actual measured moisture content of cement-stabilized crushed stone in the field is 5.2%, while the measured moisture content of the cement-stabilized crushed stone mixture is 5.5%. Compared with the optimum moisture content of 5.0% for cement-stabilized crushed stone mixture, the method of this invention improves the accuracy of moisture content measurement of cement-stabilized crushed stone.

[0042] Example 2

[0043] The present invention provides a rapid method for detecting the moisture content of ultra-large particle size cement-stabilized crushed stone, which is implemented according to the following steps:

[0044] Step 1: Laboratory determination of the optimum moisture content ω of cement-stabilized crushed stone mixture with 3% cement dosage. opt The concentration was 4.5%, therefore, cement-stabilized crushed stone mixtures were prepared in the laboratory at concentrations of 3.5% (ω1), 4.5% (ω2), and 5.5% (ω3).

[0045] Step 2: Pass the cement-stabilized crushed stone mixture with different moisture contents through a 4.75mm sieve to obtain cement mortar as the sieve undersize.

[0046] Step 3: The laboratory used the drying method to test the moisture content of the cement mortar, which was found to be 4.6% (ω). s1 ), 5.8% (ω) s2 ), 6.7% (ω) s3 );

[0047] Step 4, using the cement mortar moisture content ω si Plot a relationship curve with the x-axis representing the horizontal axis and the moisture content ωi of cement-stabilized crushed stone as the y-axis, and establish the corresponding empirical formula (Formula 2), such as... Figure 2 As shown;

[0048] y = 0.95x - 0.89

[0049] R 2 =0.993 (2);

[0050] In the formula: x is the horizontal coordinate, and y is the vertical coordinate;

[0051] Step 5: Take 3000g of cement-stabilized crushed stone mixture sample from the construction site and pass it through a 4.75mm sieve to obtain cement mortar sample;

[0052] Step 6: Take 500g of cement mortar sample and test it using the microwave oven method to find that the water content of the cement mortar sample is 6.0%.

[0053] Step 7, substitute the 6.0% moisture content of the cement mortar sample into the equation. Figure 2 According to the empirical formula, the actual measured moisture content of cement-stabilized crushed stone in the field is 4.6%, while the measured moisture content of the cement-stabilized crushed stone mixture is 5.0%. Compared with the optimum moisture content of 4.5% for cement-stabilized crushed stone mixture, the method of this invention improves the accuracy of measuring the moisture content of cement-stabilized crushed stone.

[0054] The foregoing description illustrates and describes several preferred embodiments of the invention. However, as previously stated, it should be understood that the invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the inventive concept described herein through the foregoing teachings or techniques or knowledge in related fields. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the invention should be within the protection scope of the appended claims.

Claims

1. A method for rapid detection of water content of super large particle size cement stabilized macadam, characterized in that, Specifically, the steps are implemented as follows: Step 1, cement stabilized gravel mixture with different water contents (ω i ) were prepared in the laboratory according to the actual cement dosage Step 2, the cement stabilized macadam mixture with different water contents obtained by mixing is sieved to obtain cement mortar; Step 3, measure the water content (ω si ) of the cement mortar in the laboratory Step 4, take the water content (ω si ) of the cement mortar as the horizontal coordinate, the water content (ω i ) of the cement stabilized macadam as the vertical coordinate to draw the relationship curve, and establish the corresponding empirical formula; Step 5, when the water content of the cement stabilized macadam mixture is detected at the construction site or the mixing station, a representative sample is taken and sieved to obtain a cement mortar sample; Step 6, take the cement mortar sample, test the water content (ω ci ) of the cement mortar sample; Step 7, determine the moisture content (ω) of the cement mortar sample. ci Substituting into the empirical formula, the moisture content (ω) of cement-stabilized crushed stone measured on-site can be obtained.

2. The method for rapid detection of water content of super large size cement stabilized macadam according to claim 1, characterized in that, In said step 1, different water contents are ω opt - 1.0%, ω opt , ω opt + 1.0%, wherein: ω opt is the optimal water content.

3. The method for rapid detection of water content of super large size cement stabilized macadam according to claim 2, characterized in that, In the steps 2 and 5, the sieving is performed through a 4.75 mm sieve.

4. The method for rapid detection of water content of super large size cement stabilized macadam according to claim 3, characterized in that, In the step 3, the water content (ω si ) of the cement mortar is tested in the laboratory using the oven drying method or the alcohol method.

5. The method for rapid detection of water content of super large size cement stabilized macadam according to claim 4, characterized in that, The water content (ω) of the cement mortar samples was tested by using a microwave oven method, an oven drying method or an alcohol method. ci )

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