Skid Resistance of Magnesium Chloride Roads

Author:

González Álvaro1,Paniagua Fernando2,Chamorro Alondra3

Affiliation:

1. School of Civil Engineering, Universidad del Desarrollo, Avenida Plaza 680, San Carlos de Apoquindo, Las Condes, Santiago, Chile 7610471.

2. Servial Ltda., Avenida Plaza 680, San Carlos de Apoquindo, Las Condes, Santiago, Chile 7610658.

3. Departamento de Ingeniería y Gestión de la Construcción, Escuela de Ingeniería, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, Edif. San Agustín, Piso 3, Santiago, Chile 7820436.

Abstract

Hygroscopy is the main stabilization mechanism that explains the good performance of magnesium chloride hexahydrate (6H2OMgCl2 or simply MgCl) roads, as it absorbs and retains relative humidity (RH), reducing erosion and increasing durability. However, road users have observed that the skid resistance of MgCl roads decreases with increased RH. To study the skid resistance of MgCl roads, the study calculated the drag factor or friction coefficient of the road surface with a braking test, in which an accelerometer was installed in a vehicle and deceleration was recorded during braking. The braking test was used to calculate the effect of RH and surface condition on skid resistance in 30 road sections located in the northern region of Chile. The testing was designed with a factorial experiment that took the following into consideration: surface condition (well-graded, sealed, and loose aggregate), whether water was artificially added to the surface (normal or wet), and a wide range of RH (between 10% and 70%). The results showed that when RH was greater than 35% to 40%, the friction of MgCl roads decreased as RH increased. In environments in which the air humidity was lower than 60%, the friction coefficient was higher than 0.55, a value that provides suitable friction conditions for most geometric designs for low-volume roads. The study showed that a braking test is a simple and consistent tool for assessing braking performance on MgCl roads. In addition, the study concluded that special attention should be given to surface characteristics and geometric design where MgCl road sections are exposed to RH greater than 60%.

Publisher

SAGE Publications

Subject

Mechanical Engineering,Civil and Structural Engineering

Cited by 1 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Analysis of roughness performance of chloride-stabilised rural roads;International Journal of Pavement Engineering;2020-02-11

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