Preparation process of anti-shrinkage and anti-cracking road water stable layer material containing slag

CN122502160BActive Publication Date: 2026-08-28SHANDONG UNIV
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Patent Information

Application Number
CN202610999385.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2026-07-07
Publication Date
2026-08-28
Estimated Expiration
2046-07-07

AI Technical Summary

Technical Problem

[0005]针对上述的问题，本发明提供一种含有渣土的防干缩开裂型道路水稳层材料的制备工艺，其能够有效克服掺有渣土的路水稳层由于干缩开裂引发的承载能力下降的问题，促进了工程渣土在道路水稳层中的应用，有助于拓展工程渣土的应用场景，提升其利用率

Benefits of technology

本发明先采用再生混凝土微粉、月桂酰谷氨酸粉、氟硅酸镁粉对工程渣土进行改性，然后再用氨基硅烷和N,N,N-三甲基甘氨酸进一步改性形成防干缩开裂型渣土粉。将其作为较低水灰比的道路水稳层材料的原料时，一方面，在所述氨基硅烷和N,N,N-三甲基甘氨酸的作用下有效防止了渣土颗粒团聚。为此，本发明先将氨基硅烷上的氨基进行质子化，并在此过程中使氨基硅烷上的硅烷基水解后形成硅羟基，其可以与所述渣土颗粒表面的硅羟基缩合形成Si-O-Si键，从而在渣土颗粒表面牢固地负载质子化的氨基硅烷，然后本发明进一步利用N,N,N-三甲基甘氨酸改性处理后，所述渣土颗粒表面的质子化氨基与N,N,N-三甲基甘氨酸上的羧基吸附实现其负载的同时，N,N,N-三甲基甘氨酸在其另一端季铵阳离与所述质子化氨基的静电斥力下使N,N,N-三甲基甘氨酸向外伸展，从而在渣土颗粒表面构建空间位阻+阳离子屏蔽层，使渣土颗粒之间不易接触团聚，显著提升了其分散性，从而使渣土颗粒能够更加均匀地分布在道路水稳层材料的基体中，防止聚集形成更加容易开裂的薄弱区。另一方面，在道路水稳层材料水化硬化的中后期，本发明的所述防干缩开裂型渣土粉中的月桂酰谷氨酸与水泥水化产物氢氧化钙以及再生混凝土微粉提供的氢氧化钙反应后形成月桂酰谷氨钙和水分，不仅能够向体系中补充水分，再加上所述N,N,N-三甲基甘氨酸还能够抑制水分的蒸发，可以有效缓解干缩引起的开裂。同时，所述月桂酰谷氨钙还能够有效降低所述水分的表面张力，从而降低诱导干缩的毛细管压力，进一步缓解干缩引起的开裂。再一方面，所述防干缩开裂型渣土粉中的氟硅酸镁在所述氢氧化钙的碱性环境下分解后形成氟化钙、氢氧化镁、二氧化硅凝胶和水分（MgSiF6+Ca(OH)2→CaF2+Mg(OH)2+SiO2+H2O），不仅可向体系中补充水分缓解干缩引起的开裂，而且所述二氧化硅凝胶和水分被氢氧化钙转化为水化硅酸钙胶凝产物，其可以起到提升本发明道路水稳层材料基体强度的作用，同时，所述CaF2和Mg(OH)2还能够密实水化硅酸钙胶凝产物，有助于进一步提高本发明道路水稳层材料抵抗干缩开裂的能力。

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Abstract

The application relates to the field of building materials, and particularly discloses a preparation process of a dry-shrinkage-cracking-preventing road water stable layer material containing slag, which comprises the following steps: (1) grinding engineering slag powder, recycled concrete micro powder, lauroyl glutamic acid powder and magnesium fluorosilicate powder to obtain a slag-based composite powder; (2) adding aminosilane into an ethanol aqueous solution, and then adding acid liquor to obtain a protonated aminosilane solution; mixing the composite powder with the aminosilane solution, drying, and grinding to obtain modified slag powder; (3) mixing the modified slag powder with saturated liquid anhydrous ethanol containing N,N,N-trimethyl glycine, and then drying to obtain dry-shrinkage-cracking-preventing slag powder; and (4) mixing cement, coarse aggregate, fine aggregate, the dry-shrinkage-cracking-preventing slag powder and fibers with mixing water, so that the road water stable layer material is obtained. The application effectively overcomes the problem of the decrease of the bearing capacity of the road water stable layer caused by dry-shrinkage cracking, and promotes the application of engineering slag in the road water stable layer.
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Citation Information

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