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CN-121974610-A - Novel MSM cement stabilized macadam mixture and manufacturing method thereof

CN121974610ACN 121974610 ACN121974610 ACN 121974610ACN-121974610-A

Abstract

The invention relates to a novel MSM cement stabilized macadam mixture and a preparation method thereof, the composite material is formed by mixing a primary framework, a secondary framework, a tertiary framework, a filler, cement and water according to a mixing ratio. The invention has the advantages that the cement stabilized macadam base layer has better crack resistance, deformation resistance and durability. Meanwhile, the MSM structure can be also used for the asphalt mixture surface layer, so that the rutting resistance of the asphalt surface layer can be obviously improved, and the high-temperature stability of the asphalt mixture is improved.

Inventors

  • WANG HONGYAN

Assignees

  • 王红岩

Dates

Publication Date
20260505
Application Date
20240416

Claims (10)

  1. 1. A novel MSM cement stabilized macadam mixture is characterized by being formed by mixing a primary framework, a secondary framework, a tertiary framework, a filler, cement and water according to a mix proportion; The primary framework, the secondary framework and the tertiary framework all adopt single-particle-size broken stone with the particle size larger than 2.36mm, and the filling material is continuous grading machine-made sand or stone powder with the maximum particle size of 2.36 mm; the primary skeleton engineering particle size is one of 19-26.5mm, 26.5-31.5mm and 26.5-37.5 mm; the particle size of the secondary skeleton engineering is one of 9.5-13.5mm and 9.5-16 mm; the three-stage skeleton engineering particle size is one of 2.36-4.75mm and 4.75-9.5 mm.
  2. 2. The novel MSM cement stabilized macadam mixture as claimed in claim 1, wherein the filler is clean, dry, weathered-free and impurity-free machine-made sand, the plasticity index is less than or equal to 17%, the organic matter content is less than 2%, and the sulfate content is less than or equal to 0.25%.
  3. 3. The novel MSM cement stabilized macadam mixture as claimed in claim 1, wherein the cement is ordinary Portland cement, slag Portland cement or pozzolanic Portland cement with the strength grade of 32.5 or 42.5, the initial setting time of the cement is more than 3 hours, and the final setting time is more than 6 hours and less than 10 hours; When bulk cement is adopted, the cement should be parked for more than 7d after being discharged from the furnace, and the cement can be used after the stability is detected to be qualified; quick hardening cement, early strength cement and spoiled wet cement cannot be used.
  4. 4. The novel MSM cement stabilized macadam mixture according to claim 1, wherein the water is drinking water or non-drinking water; the drinking water meets the sanitary standard of drinking water for life (GB 5749); The technical requirement of the non-drinking water is that the pH value is more than or equal to 4.5, the CT content is less than or equal to 3500mg/L, SO, the content is less than or equal to 2700mg/L and the alkali content 1500Mg/L or less, 10000mg/L or less of soluble matters, 5000mg/L or less of insoluble matters, no floating grease and foam, and obvious color and peculiar smell.
  5. 5. The novel MSM cement stabilized macadam mixture as claimed in claim 1, wherein the MSM cement stabilized macadam mixture has maximum dry density and optimal water content by adopting a surface vibration compaction method.
  6. 6. The novel MSM cement stabilized macadam mixture according to claim 1, wherein in the mix proportion design, in order to ensure the formation of frameworks, the part with the passing rate of each level of framework aggregates of less than 10% is used as a secondary framework and is involved in the proportion calculation of the secondary framework; the mix proportion design should select at least 5 binder doses, and respectively determine the maximum dry density and the optimal water content under each dose condition; Forming a standard test piece according to the optimal water content, the maximum dry density and the compactness requirement determined by the test, verifying the technical performance of the mixture under the condition of different binder dosages, and determining the optimal dosage meeting the design requirement; The performance of the verified mixture mainly refers to the 90 d-age flexural tensile strength, the compressive resilience modulus and the 7 d-age unconfined compressive strength.
  7. 7. The novel MSM cement stabilized macadam mixture according to claim 1, wherein the recommended cement dosage for the mixing proportion design of the MSM cement stabilized macadam mixture is specified in the technical rules of road pavement basic construction.
  8. 8. The novel MSM cement stabilized macadam mixture as claimed in claim 1, wherein the minimum cement consumption is in accordance with the specification of the technical rules for construction of road pavement base.
  9. 9. The preparation method of the novel MSM cement stabilized macadam mixture is characterized by comprising the following steps of: 1) First-class skeleton, namely measuring the skeleton clearance rate of the first-class skeleton in the tamping state according to a method specified by a coarse aggregate bulk density and void ratio test (T0309-2005) in highway engineering aggregate test procedure (JTG E42-2005); 2) The second-stage framework is doped, namely the second-stage framework aggregate is doped into the first-stage framework according to the principle of proportion from small to large, framework gap rate tests are respectively carried out, the initial gap rate can be 5% or 10% (the mass ratio of the second-stage framework to the first-stage framework) and the gap rate is 5% until the gap rate of the mixture framework tends to be stable and begins to increase, and the proper second-stage framework is selected for drawing; 3) Adding a tertiary framework, namely determining the proportion of the tertiary framework by adopting a method for determining the proportion of the primary framework and the secondary framework, firstly preparing the primary framework and the secondary framework according to the determined proportion, determining the void ratio by adopting a layer-paving tamping method, then adding the tertiary framework into a secondary framework mixture according to the proportion of 5% or 10%, and performing a framework gap ratio test by adopting the layer-paving tamping method until the gap ratio tends to be stable and starts to increase; 4) The mass ratio of the filler to the skeleton aggregate is calculated; 5) Stirring, namely adding cement and mixing water for stirring.
  10. 10. The method for preparing the novel MSM cement stabilized macadam mixture according to claim 9, wherein the primary framework, the secondary framework, the tertiary framework and the filling materials are stored and detected in batches, stored in bins and have protection measures such as coverage.

Description

Novel MSM cement stabilized macadam mixture and manufacturing method thereof Technical Field The invention relates to the technical field of building materials, in particular to a novel MSM cement stabilized macadam mixture and a manufacturing method thereof. Background Although the common cement stabilized macadam and other semi-rigid materials have higher strength and modulus, shrinkage cracks are also unavoidable, and in engineering practice for many years, the problem of cracks is not solved well. In addition, the deformation resistance and durability of the alloy have certain defects. Therefore, a novel MSM cement stabilized macadam mixture and a manufacturing method thereof are needed to be researched. Disclosure of Invention The invention aims to provide a novel MSM cement stabilized macadam mixture and a manufacturing method thereof, so as to solve the problems in the background technology. In order to solve the technical problems, the technical scheme provided by the invention is that the novel MSM cement stabilized macadam mixture is formed by mixing a primary framework, a secondary framework, a tertiary framework, a filler, cement and water according to a mix proportion design; The primary framework, the secondary framework and the tertiary framework all adopt single-particle-size broken stone with the particle size larger than 2.36mm, and the filling material is continuous grading machine-made sand or stone powder with the maximum particle size of 2.36 mm; the primary skeleton engineering particle size is one of 19-26.5mm, 26.5-31.5mm and 26.5-37.5 mm; the particle size of the secondary skeleton engineering is one of 9.5-13.5mm and 9.5-16 mm; the three-stage skeleton engineering particle size is one of 2.36-4.75mm and 4.75-9.5 mm. As a preferable scheme, the filling material is clean, dry, weathered-free and impurity-free machine-made sand, the plasticity index is less than or equal to 17%, the organic matter content is less than 2%, and the sulfate content is less than or equal to 0.25%. As a preferable scheme, the cement adopts ordinary Portland cement, slag Portland cement or pozzolanic Portland cement with the strength grade of 32.5 or 42.5, the initial setting time of the cement is more than 3 hours, and the final setting time is more than 6 hours and less than 10 hours; When bulk cement is adopted, the cement should be parked for more than 7d after being discharged from the furnace, and the cement can be used after the stability is detected to be qualified; quick hardening cement, early strength cement and spoiled wet cement cannot be used. As a preferred scheme, the water is drinking water or non-drinking water; the drinking water meets the sanitary standard of drinking water for life (GB-5749); The technical requirements of the non-drinking water are that the pH value is more than or equal to 4.5, the CT content is less than or equal to 3500mg/L, SO & lt- & gt, the alkali content is less than or equal to 2700mg/L, the soluble content is less than or equal to 10000mg/L, the insoluble content is less than or equal to 5000mg/L, and the non-drinking water has no floating grease and foam and obvious color and peculiar smell. As a preferred embodiment, the MSM cement stabilized macadam mixture has a maximum dry density and an optimal water content by a surface vibration compaction method. As a preferable scheme, in the mix proportion design, in order to ensure the formation of frameworks, the part with the passing rate of each level of framework aggregate less than 10% is used as a secondary framework and is involved in the proportion calculation of the secondary framework; the mix proportion design should select at least 5 binder doses, and respectively determine the maximum dry density and the optimal water content under each dose condition; Forming a standard test piece according to the optimal water content, the maximum dry density and the compactness requirement determined by the test, verifying the technical performance of the mixture under the condition of different binder dosages, and determining the optimal dosage meeting the design requirement; The performance of the verification mixture mainly refers to the flexural tensile strength and compressive resilience modulus at the age of 90d and the unconfined compressive strength at the age of 7 d; As a preferable scheme, the recommended cement dosage for the MSM cement stabilized macadam mixture proportion design adopts the specification of the technical rules for construction of highway pavement base. As a preferable scheme, the minimum cement consumption accords with the regulations of the technical rules for constructing the road pavement base. The preparation method of the novel MSM cement stabilized macadam mixture specifically comprises the following steps: 1) First-class skeleton, namely measuring the skeleton clearance rate of the first-class skeleton in the tamping state according to a method specified by a coarse aggregate bulk