Search

CN-122010457-A - Cement stabilized macadam base additive and cement stabilized macadam base prepared based on additive

CN122010457ACN 122010457 ACN122010457 ACN 122010457ACN-122010457-A

Abstract

The invention discloses a cement stabilized macadam base additive and a cement stabilized macadam base prepared based on the additive, wherein the additive comprises inorganic sodium salt, potassium persulfate, styrene, a silane coupling agent, triethanolamine, a water reducing agent, polyethylene glycol, sodium silicate, calcium chloride and the balance of water; when the cement stabilized macadam base is prepared, firstly, inorganic sodium salt, water glass, calcium chloride, styrene, triethanolamine and polyethylene glycol are mixed with part of water to obtain solution A, then potassium persulfate, a silane coupling agent and a water reducing agent are mixed with the rest of water to obtain solution B, finally, macadam, cement, solution A and solution B are mixed, water is supplemented according to the water content of the cement stabilized macadam base mixture, and the mixture is stirred and transported to pavement. After the cement stabilized macadam base additive is mixed with the cement stabilized macadam base material, the early strength of the base can be improved, the maintenance time can be shortened, the vibration can be reduced, the interface bonding capability of macadam and cement can be effectively improved, and the occurrence of reflective cracks can be avoided.

Inventors

  • WANG WEIDONG
  • LI PEINING
  • WEI TANGZHONG
  • ZHU DINGJUN

Assignees

  • 南京兴佑交通科技有限公司
  • 江苏宁路新材料科技有限公司

Dates

Publication Date
20260512
Application Date
20251228

Claims (7)

  1. 1. The cement stabilized macadam base additive is characterized by comprising, by mass, 9-12% of inorganic sodium salt, 0.2-0.6% of potassium persulfate, 1.0-2.0% of styrene, 0.1-0.3% of silane coupling agent, 3-4.5% of triethanolamine, 15-20% of water reducer, 2-4% of polyethylene glycol, 10-13% of water glass, 10-15% of calcium chloride and the balance of water.
  2. 2. The cement stabilized macadam base admixture according to claim 1, wherein the inorganic sodium salt is sodium thiosulfate and sodium nitrite in a mass ratio of (0.9-1.3) 1.
  3. 3. The cement stabilized macadam base admixture according to claim 1, wherein the water reducing agent is a polycarboxylate water reducing agent, the water reducing rate is not less than 20%, and the solid content is 35-40%.
  4. 4. The cement stabilized macadam base admixture of claim 1, wherein said polyethylene glycol has an average molecular weight of 4000-6000 and a water glass modulus of 2.8-3.0.
  5. 5. A cement stabilized macadam base comprising a base material of macadam and cement and the admixture of claim 1 incorporated into the base material, prepared by the steps of: (1) Mixing inorganic sodium salt, sodium silicate, calcium chloride, styrene, triethanolamine and polyethylene glycol with water accounting for (1/2-3/4) of the mass of the mixture to obtain a solution A; (2) Mixing potassium persulfate, a silane coupling agent and a water reducing agent with the rest water to obtain a solution B; (3) Mixing the crushed stone, the cement, the solution A and the solution B, supplementing water according to the water content of the cement stabilized crushed stone base mixture, and stirring and transporting to be paved.
  6. 6. The cement stabilized macadam foundation of claim 5, wherein in step (3), the total addition of the solution a and the solution B is 0.5-1.5% by mass of cement.
  7. 7. The cement stabilized macadam base of claim 5, wherein in step (3) the cement is added in an amount of 3.5% to 5% by mass of the cement stabilized macadam.

Description

Cement stabilized macadam base additive and cement stabilized macadam base prepared based on additive Technical Field The invention belongs to the technical field of cement stabilized macadam base, and particularly relates to a cement stabilized macadam base additive and a cement stabilized macadam base prepared based on the cement stabilized macadam base additive. Background Highway pavement structures generally consist of a surface layer, a base layer, and a cushion layer. Compared with other basic structures, the cement stabilized macadam has the advantages of high strength, strong integrity, good durability and the like, is not muddy when meeting rain after survival, has solid surface, is a relatively ideal semi-rigid basic material, and is one of the basic materials most commonly used for highway pavements, especially high-grade pavements. However, in the cement stabilized macadam base material used for the base, the macadam is extremely easy to form shrinkage and temperature shrinkage cracks under the action of cement hydration reaction, and the road is a strip-shaped structure, so that transverse cracks of the base are more easily caused. Under the action of the wheel load, the cracks are transferred to the upper asphalt concrete structural layer, so that serious reflection cracks appear on the road surface layer, the road surface is damaged, and structural repair measures have to be taken. In order to ensure enough bearing capacity, the early strength of the cement stabilized macadam base is slow to form, and the cement stabilized macadam base can be subjected to surface layer construction after at least 7 days of maintenance. However, with the increase of traffic volume, traffic jam is easily caused due to the excessively long maintenance time. The early strength of the cement stabilized macadam is rapidly improved, and the realization of rapid communication is one of the effective means for solving the dilemma. In addition, vibratory roller is generally adopted for vibration compaction in the cement stabilized macadam paving process, and along with the improvement of tonnage of the vibratory roller, exciting force of the vibratory roller is higher. The mechanical wave generated by the exciting force is harmful to nearby buildings, and the mechanical wave energy causes the nearby buildings to vibrate together, and even causes cracks to occur in the buildings. Based on the above, a novel cement stabilized macadam base layer which does not need or has small tonnage vibration compaction, can greatly shorten maintenance time and avoid reflective cracks is studied. Disclosure of Invention The invention aims to solve the technical problem of providing the cement stabilized macadam base additive, which can not only improve the early strength of the base, reduce the maintenance time and vibration, but also effectively improve the interface bonding capability of macadam and cement and avoid the generation of reflective cracks after being mixed into the cement stabilized macadam base. The cement stabilized macadam base additive comprises, by mass, 9-12% of inorganic sodium salt, 0.2-0.6% of potassium persulfate, 1.0-2.0% of styrene, 0.1-0.3% of a silane coupling agent, 3-4.5% of triethanolamine, 15-20% of a water reducer, 2-4% of polyethylene glycol, 10-13% of water glass, 10-15% of calcium chloride and the balance of water. Further, the inorganic sodium salt used in the additive can be sodium thiosulfate and sodium nitrite in a mass ratio of (0.9-1.3): 1. Furthermore, the water reducer adopted by the additive can be a polycarboxylic acid water reducer, the water reducing rate is more than or equal to 20%, and the solid content is 35-40%. Further, the polyethylene glycol adopted by the additive has an average molecular weight of 4000-6000 and a water glass modulus of 2.8-3.0. The cement stabilized macadam base comprises a base material consisting of macadam and cement, and the additive which is blended into the base material and is prepared by the following steps: (1) Mixing inorganic sodium salt, sodium silicate, calcium chloride, styrene, triethanolamine and polyethylene glycol with water accounting for (1/2-3/4) of the mass of the mixture to obtain a solution A; (2) Mixing potassium persulfate, a silane coupling agent and a water reducing agent with the rest water to obtain a solution B; (3) Mixing the crushed stone, the cement, the solution A and the solution B, supplementing water according to the water content of the cement stabilized crushed stone base mixture, and stirring and transporting to be paved. Further, in the preparation step (3) of the cement stabilized macadam base, the total addition amount of the solution A and the solution B is 0.5-1.5% of the mass of cement. Further, the cement in the preparation step (3) of the cement stabilized macadam base layer is added in an amount which is 3.5-5% of the mass of the cement stabilized macadam. Compared with the prior art, the additive has the advan