Method for rapidly detecting water content of cement stabilized macadam with ultra-large particle size

Abstract

The invention discloses a method for rapidly detecting the water content of cement stabilized macadam with ultra-large particle size. The method comprises the following steps: mixing cement stabilized macadam mixtures with different water contents in a laboratory according to the actually used cement dosage; sieving the mixed cement stabilized macadam mixtures with different water contents to obtain cement mortar; testing the water content of the cement mortar in a laboratory; drawing a relation curve by taking the water content of the cement mortar as an abscissa and the water content of the cement stabilized macadam as an ordinate, and establishing a corresponding empirical formula; when the water content of the cement stabilized macadam mixture is detected in a construction site or a mixing station, a representative sample is taken and sieved, and a cement mortar sample is obtained; taking a cement mortar sample, and testing the water content of the cement mortar sample; and substituting the water content of the cement mortar sample into an empirical formula to obtain the actually measured water content of the cement stabilized macadam in site construction. According to the method for rapidly detecting the water content of the cement stabilized macadam with the ultra-large particle size, the problems of poor sampling representativeness, long water content testing time and poor precision are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of traffic civil engineering, and in particular relates to a method for quickly detecting the water content of cement-stabilized crushed stone with super-large particle size. Background Art

[0002] The moisture content of cement-stabilized crushed stone is an important indicator for quality control of construction sites. The key to quality control is that the test results accurately reflect actual production, and the representativeness of sampling (whether it is consistent with the designed mix ratio) directly affects the test results.

[0003] At present, the methods for measuring the moisture content of cement-stabilized crushed stone mixture on-site are drying method and alcohol method. These methods have the following problems in measuring moisture content on-site: ① Due to the high content of coarse aggregate in the mixture, on-site sampling is prone to coarse and fine segregation, and the representativeness is poor. If the sample has a high content of coarse aggregate, the moisture content test value is too small, otherwise the test value is too large, which cannot reflect the true value of the moisture content; ② On-site moisture content testing requires sampling of more than 2000g using drying method or alcohol method, which takes a long time to test, has poor test accuracy, and the safety of alcohol method testing cannot be guaranteed. All of these are unfavorable to the quality control of the on-site construction process.

[0004] Extra-large particle size cement-stabilized gravel refers to cement-stabilized gravel with a nominal maximum particle size of 53 mm. Because the nominal maximum particle size of the coarse aggregate in the mixture is large and the coarse aggregate content is high, the difficulty of sampling representativeness and the accuracy of the test are increased. Summary of the invention

[0005] The purpose of the invention is to provide a method for quickly detecting the moisture content of cement-stabilized crushed stone with super-large particle size, so as to solve the problems of poor sampling representativeness, long moisture content test time and poor accuracy.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is: a method for quickly detecting the water content of cement-stabilized crushed stone with super-large particle size, which is specifically implemented according to the following steps:

[0007] Step 1: Mix different water contents (ω i ) of cement-stabilized aggregate mixture;

[0008] Step 2, sieving the cement-stabilized crushed stone mixtures with different moisture contents to obtain cement mortar;

[0009] Step 3: Test the moisture content of cement mortar in the laboratory (ω si );

[0010] Step 4: Take the moisture content of cement mortar (ω si ) is the horizontal axis, the moisture content of cement-stabilized crushed stone (ω i ) is used as the ordinate to draw a relationship curve and establish a corresponding empirical formula;

[0011] Step 5, when testing the moisture content of the cement-stabilized crushed stone mixture at the construction site or mixing station, a representative sample is taken and sieved to obtain a cement mortar sample;

[0012] Step 6: Take cement mortar samples and test the moisture content of cement mortar samples (ω ci );

[0013] Step 7: The moisture content of the cement mortar sample (ω ci ) into the empirical formula, we can get the moisture content (ω) of cement-stabilized crushed stone measured on-site.

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

[0015] As a preferred technical solution of the present invention, in step 2 and step 5, the slurry is sieved through a 4.75 mm sieve.

[0016] As a preferred technical solution of the present invention, in step 3, the moisture content (ω si ).

[0017] As a preferred technical solution of the present invention, the moisture content (ω ci ).

[0018] The beneficial effects of the present invention are as follows: the method for quickly detecting the moisture content of cement-stabilized gravel with ultra-large particle size of the present invention avoids sample coarse and fine segregation and poor representativeness by passing the cement-stabilized gravel through a 4.75 mm sieve, reduces the mass of the cement mortar sample used for the test and uses a microwave oven method for rapid testing to reduce the test time, thereby achieving the goal of rapid and accurate testing of the moisture content of cement-stabilized gravel. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a curve diagram showing the relationship between the moisture content of cement-stabilized crushed stone and the moisture content of cement mortar in Example 1;

[0020] Figure 2 This is a curve diagram showing the relationship between the moisture content of cement-stabilized crushed stone and the moisture content of cement mortar in Example 2. DETAILED DESCRIPTION

[0021] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0022] The method for quickly detecting the water content of cement-stabilized crushed stone with super-large particle size of the present invention is specifically implemented according to the following steps:

[0023] Step 1: Mix cement with different water contents in the laboratory according to the actual cement dosage. i Cement stabilized gravel mixture; the moisture content is recommended to be ω opt -1.0%,ω opt ,ω opt +1.0%,ω opt The optimum water content

[0024] Step 2, passing the mixed cement-stabilized crushed stone mixture with different moisture contents through a 4.75 mm sieve to obtain cement mortar;

[0025] Step 3: Use the drying method or alcohol method to test the moisture content of cement mortar in the laboratory. si ;

[0026] Step 4: Take the moisture content of cement mortar ω si is the horizontal axis, the moisture content of cement-stabilized crushed stone ω i Draw a relationship curve for the ordinate and establish the corresponding empirical formula;

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

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

[0029] Step 7: The moisture content of the cement mortar sample is ω ci Substituting it into the empirical formula, we can obtain the moisture content ω of cement-stabilized gravel measured on-site.

[0030] Example 1

[0031] The method for quickly detecting the water content of cement-stabilized crushed stone with super-large particle size of the present invention is specifically implemented according to the following steps:

[0032] Step 1: Laboratory determination of the optimum water content of cement-stabilized crushed stone mixture with 4% cement dosage opt is 5.0%, therefore, cement-stabilized crushed stone mixtures were mixed in the laboratory at 4.0% (ω1), 5.0% (ω2), and 6.0% (ω3);

[0033] Step 2, passing the mixed cement-stabilized crushed stone mixture with different moisture contents through a 4.75 mm sieve to obtain cement mortar;

[0034] Step 3: The moisture content of cement mortar tested by drying method in the laboratory is 5.6% (ωs1), 6.6% (ωs2), and 7.8% (ωs3);

[0035] Step 4: Take the moisture content of cement mortar ω si The relationship curve is drawn with the moisture content of cement-stabilized crushed stone ωi as the horizontal axis and the moisture content of cement-stabilized crushed stone ωi as the vertical axis, and the corresponding empirical formula (Formula 1) is established, as follows: 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, y is the vertical coordinate;

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

[0040] Step 6, taking 500 g of cement mortar sample, and testing by microwave oven method to obtain a moisture content of the cement mortar sample of 6.9%;

[0041] Step 7: Substitute the moisture content of the cement mortar sample into 7.0% Figure 1 According to the empirical formula, the moisture content of cement stabilized gravel measured on site is 5.2%, while the moisture content of cement stabilized gravel mixture sampled is 5.5%. Compared with the optimum moisture content of cement stabilized gravel mixture of 5.0%, the measurement accuracy of moisture content of cement stabilized gravel is improved by the method of the present invention.

[0042] Example 2

[0043] The method for quickly detecting the water content of cement-stabilized crushed stone with super-large particle size of the present invention is specifically implemented according to the following steps:

[0044] Step 1: Laboratory determination of the optimum water content of cement-stabilized crushed stone mixture with 3% cement dosage opt is 4.5%, therefore, cement-stabilized crushed stone mixtures were mixed in the laboratory at 3.5% (ω1), 4.5% (ω2), and 5.5% (ω3);

[0045] Step 2, passing the mixed cement-stabilized crushed stone mixtures with different moisture contents through a 4.75 mm sieve to obtain cement mortar;

[0046] Step 3: The moisture content of cement mortar was 4.6% (ω s1 ), 5.8%(ω s2 )、6.7%(ω s3 );

[0047] Step 4: Take the moisture content of cement mortar ω si The relationship curve is drawn with the moisture content of cement-stabilized crushed stone ωi as the horizontal axis and the moisture content of cement-stabilized crushed stone ωi as the vertical axis, and the corresponding empirical formula (Formula 2) is established, as follows: 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, y is the vertical coordinate;

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

[0052] Step 6, taking 500 g of cement mortar sample, and testing by microwave oven method to obtain a moisture content of the cement mortar sample of 6.0%;

[0053] Step 7: Substitute the moisture content of the cement mortar sample into Figure 2 According to the empirical formula, the moisture content of cement stabilized gravel measured on site is 4.6%, while the moisture content of cement stabilized gravel mixture sampled is 5.0%. Compared with the optimum moisture content of cement stabilized gravel mixture of 4.5%, the measurement accuracy of the moisture content of cement stabilized gravel is improved by the method of the present invention.

[0054] The above description shows and describes several preferred embodiments of the invention, but as mentioned above, it should be understood that the invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the invention concept described herein through the above teachings or the technology or knowledge of the relevant field. Changes and modifications made by those skilled in the art should be within the scope of protection of the claims attached to the invention without departing from the spirit and scope of the invention.

Claims

1. A method for rapid detection of water content in cement-stabilized crushed stone with super-large particle size, characterized in that: Specific steps to implement: Step 1: Mix different water contents (ω i ) of cement-stabilized aggregate mixture; Step 2, sieving the cement-stabilized crushed stone mixtures with different moisture contents to obtain cement mortar; Step 3: Test the moisture content of cement mortar in the laboratory (ω si ); Step 4: Take the moisture content of cement mortar (ω si ) is the horizontal axis, the moisture content of cement-stabilized crushed stone (ω i ) is used as the ordinate to draw a relationship curve and establish a corresponding empirical formula; Step 5, when testing the moisture content of the cement-stabilized crushed stone mixture at the construction site or mixing station, a representative sample is taken and sieved to obtain a cement mortar sample; Step 6: Take cement mortar samples and test the moisture content of cement mortar samples (ω ci ); Step 7: The moisture content of the cement mortar sample (ω ci ) into the empirical formula, we can get the moisture content (ω) of cement-stabilized crushed stone measured on-site.

2. The method for rapid detection of water content of super-large particle size cement-stabilized crushed stone according to claim 1 is characterized in that: In step 1, different moisture contents are ω opt -1.0%,ω opt ,ω opt +1.0%, where:ω opt The optimum water content.

3. The method for rapid detection of water content of super-large particle size cement-stabilized crushed stone according to claim 2 is characterized in that: In step 2 and step 5, the product is passed through a 4.75 mm sieve.

4. The method for rapid detection of water content of cement-stabilized crushed stone with super-large particle size according to claim 3 is characterized in that: In step 3, the moisture content (ω si ).

5. The method for rapid detection of water content of cement-stabilized crushed stone with super-large particle size according to claim 4 is characterized in that: The moisture content of cement mortar samples was tested by microwave oven method, drying method or alcohol method (ω ci ).

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