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Modified anti-cracking cement stabilized recycled base course mixture and preparation method thereof

A technology for cement stabilization and mixing materials, applied in clay preparation equipment, cement mixing equipment, chemical instruments and methods, etc., to achieve the effects of increasing fluidity, enhancing frost resistance, and reducing shrinkage cracking problems

Active Publication Date: 2022-05-13
中国建筑土木建设有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a modified anti-crack cement stabilized recycled base material mixture and its preparation method, in order to solve the problem of significantly improving the mechanical properties of the base material while taking into account the anti-crack effect of the high-volume RMAP water-stabilized recycled base material. Technical issues of strength and durability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: Modified anti-cracking cement stabilized recycled base course mixture

[0031] (1) The mixture is made of the following raw materials in parts by weight:

[0032] 60 parts of recycled aggregate, 40 parts of natural aggregate, 4 parts of cement, 0.24 part of graphene oxide nanosheet (GO) powder, 0.12 part of multi-walled carbon nanotube (MWNTs) powder, nano magnesium oxide (nano-MgO) 0.06 parts of powder, 0.03 parts of polycarboxylate superplasticizer (PC), 0.1 parts of high-performance auxiliary dispersant, 6.3 parts of water;

[0033] The recycled aggregates used come from waste after milling and planing of old asphalt pavement. The proportion of surface layer materials in the whole waste is ≤30%, the content of fine materials less than 0.075mm is ≤10%, and the content of aggregates greater than 4.75mm is ≥ 40%.

[0034] The natural aggregates used are crushed stones and stone chips obtained by artificial crushing and screening of natural rocks or pebbles,...

Embodiment 2

[0050] Example 2: Modified anti-cracking cement stabilized recycled base course mixture

[0051] (1) The mixture is made of the following raw materials in parts by weight:

[0052] 60 parts of recycled aggregate, 40 parts of natural aggregate, 4 parts of cement, 0.24 part of GO powder, 0.12 part of MWNTs powder, 0.09 part of nano-MgO powder, 0.03 part of PC water reducer, 0.1 part of high-performance auxiliary dispersant , 6.5 parts of water;

[0053] The gradation of the mixed aggregate used in this example is shown in Table 1, the cement type used is P.O42.5, and the high-performance auxiliary dispersant used is sodium dodecylbenzenesulfonate (SDBS).

[0054] (2) The preparation method of the mixture is the same as in Example 1.

Embodiment 3

[0055] Example 3: Modified anti-cracking cement stabilized recycled base course mixture

[0056] (1) The mixture is made of the following raw materials in parts by weight:

[0057] 60 parts of recycled aggregate, 40 parts of natural aggregate, 4 parts of cement, 0.28 part of GO powder, 0.14 part of MWNTs powder, 0.07 part of nano-MgO powder, 0.03 part of PC water reducer, 0.1 part of high-performance auxiliary dispersant , 6.9 parts of water;

[0058] The gradation of the mixed aggregate used in this example is shown in Table 1, the cement type used is P.O42.5, and the high-performance auxiliary dispersant used is SDBS ionic surfactant.

[0059] (2) The preparation method of the mixture is the same as in Example 1.

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Abstract

The invention discloses a modified anti-crack cement stabilized recycled base course mixture and a preparation method thereof. It aims to solve the technical problem of significantly improving the mechanical strength and durability of the base material while taking into account the anti-crack effect of the high-volume RMAP water-stabilized recycled base material. The mixture of the present invention is made of the following raw materials: mixed aggregate, cement, nano-magnesia, graphene oxide nanosheets, carbon nanotubes, water reducer, and dispersant. The mixture of the present invention mixes three kinds of nanometer materials into the regenerated base material after synergistic dispersion treatment, while ensuring its good anti-cracking effect, it greatly improves its mechanical properties and antifreeze ability, so that the overall road performance of the regenerated base material can be improved. Significant improvement; use of high-volume waste pavement materials, wide sources of raw materials, on-site recycling, saving construction costs, environmental friendliness, and good economic and ecological benefits.

Description

technical field [0001] The invention relates to the technical field of road engineering, in particular to a modified anti-crack cement stabilized recycled base course mixture and a preparation method thereof. Background technique [0002] my country's highway construction has entered the maintenance and repair period from the high-speed construction period. As of 2019, the maintenance mileage of my country's highways has reached 98% of the mileage open to traffic. Most of the higher-grade highways are asphalt roads. With the continuous development of pavement regeneration technology, a large number of old asphalt pavement reclaimed materials (reclaimed materials from asphalt pavement) RMAP produced in the overhaul and expansion projects of old asphalt pavement in recent decades have been effectively recovered and processed by crushing and screening. Afterwards, it is regenerated as a pavement structure layer as a road construction material. However, due to the semi-rigid ba...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B28/02C04B28/08C04B14/02C04B14/30B28C5/00C04B111/34
CPCC04B28/04C04B28/021C04B28/08C04B14/026C04B14/024C04B14/304B28C5/003C04B2201/50C04B2111/0075C04B2111/343C04B18/16C04B14/02C04B2103/302C04B24/2652C04B24/20C04B2103/40
Inventor 李金星高登峰陈渊召李振霞冯纪兵魏华戚佳飞郭滕滕王朝辉陈海军陈谦任清冯秋红赵晨奥张明堂丁思卿
Owner 中国建筑土木建设有限公司
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