Abstract
According to the characteristics of stone along the KKH-2 project in Pakistan, the applicability of gravel and machine-made sand for road engineering was studied. Through investigation, the types of stone along the project were relatively simple, and the stone materials used for road construction were mainly limestone, sandstone and pebbles, and the reserves were abundant. The experiment research and analyses comparisons of the parameters and road performance characteristics of natural gravel materials were carried out, and the design parameters and road performance indicators of natural grit in the current code were supplemented and adjusted to make it more suitable for Pakistan to use natural gravel materials for road construction. Thesis combines the project, proposing that mechanism sand and natural sand mixed concrete is not inferior tonatural sand mixed concrete in terms of technical performance, and the overall cost is lower than that of natural sand mixed concrete. The research results are of great significance for saving engineering construction costs, ensuring road performance and prolonging service life.
Highlights
The Usage Situation of Machine-Made SandThe project site is extremely rich in sand and gravel materials [7]
The types of stone along the project were relatively simple, and the stone materials used for road construction were mainly limestone, sandstone and pebbles, and the reserves were abundant
The research results are of great significance for saving engineering construction costs, ensuring road performance and prolonging service life
Summary
The project site is extremely rich in sand and gravel materials [7]. Natural sand gravel materials have long been used as the base layer for secondary and below roads and the base layer for all grades of roads [8]. In Pakistan, high-grade roads, and many secondary roads have gradually adopted cement-stabilized gravel as the base layer, and the natural gravel that has been used for decades has gradually been eliminated as the secondary road pavement [9] [10] [11]. The semi-rigid base layer has many advantages, it has problems such as easy cracking and high cost, and is it necessary to use a semi-rigid base layer for the secondary road? The semi-rigid base layer has many advantages, it has problems such as easy cracking and high cost, and is it necessary to use a semi-rigid base layer for the secondary road? How much load can the graded gravel be used as the base of the pavement? Can we not use it in the secondary road? In order to solve these problems, the research project systematically studies and analyzes the parameters and road performance characteristics of natural gravel materials, and supplements and adjusts the design parameters and road performance indicators of natural grit in the current regulations to make it more suitable for Pakistan’s need to build roads with natural gravel materials
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