Time filter

Source Type

Alpharetta, GA, United States

A project to transform the 25-km dirt road from Jarabacoa to Constanza in the mountainous central region of the Dominican Republic began in February 2011. Its main goal was to reduce the time and cost to transport agricultural goods between Jarabacoa and Constanza, as well as to other towns. A secondary goal was to facilitate access to tourist destinations in the area. This project was the first time any kind of segmental block retaining wall project had been undertaken in the Dominican Republic. Therefore, there were no local experienced retaining wall installers. In this case, the manufacturer provided on-site assistance, training, and technical and design support for the project. An on-site, hands-on installation seminar was conducted for all of the project's foremen and inspectors. The hands-on experience complemented the information and examples provided during classroom instruction.

Al-Qadi I.L.,University of Illinois at Urbana - Champaign | Dessouky S.,University of Texas at San Antonio | Tutumluer E.,University of Illinois at Urbana - Champaign | Kwon J.,Tensar Corporation
International Journal of Pavement Engineering | Year: 2011

This study uses full-scale accelerated testing to provide new insight into the effectiveness of geogrids on the performance of low-volume flexible pavements. Although several previous studies reported that geogrids improve pavement performance by enhancing its structural capacity and reducing distress potential, this study goes further to quantify the effectiveness of geogrids, specify the mechanism of the reinforcement they provide and identify the optimum placement of geogrid in low-volume flexible pavements. Full-scale, low-volume flexible pavement sections were constructed on weak subgrade (California bearing ratio=4%) and heavily instrumented with 170 sensors. The pavement was divided into three cells with each cell having three sections. The granular base and hot-mix asphalt layer thicknesses varied, and each cell had at least one control and one geogrid-reinforced pavement section. The instruments were embedded to measure stress, strain, deflection, moisture, pore-water pressure and temperature and were used to monitor pavement response to a moving load using the Accelerated Transportation Loading ASsembly (ATLAS). The testing programme was divided into two parts: response testing and performance testing. The response testing considered tyre configuration, loading, inflation pressure, speed and travelling offset. The performance testing considered number of passes to failure. This paper presents the various pavement responses to different loading configurations and pavement performances when a repetitive moving dual-tyre assembly at 8km/h and 44kN was applied. Based on the performance testing and visual observation of the pavement cross sections after excavation, the reinforced sections showed reduced rutting and delayed surface cracking compared to the control sections. Specifically, the pavements' measured response showed that geogrid-reinforced pavement sections exhibited less vertical pressure and less vertical deflection in the subgrade when tested at a low speed. Therefore, the study's most notable conclusion is that geogrid reinforcement reduces the horizontal movement of the granular material, especially in the longitudinal direction. The study also concludes the following about geogrid placement: (1) for a relatively thick granular base layer, placing the geogrid in the upper one-third of the base reduces the shear strains in the longitudinal and transverse directions. (2) For weaker pavements, the geogrid reinforcement at the base-subgrade interface reduces the vertical deflection. In the second case, the effectiveness of geogrid shall be compared to the increase in pavement structure or using other geosynthetic materials such as geotextiles. © 2011 Taylor & Francis.

A roll of grid material for mine roof support, and a mining machine in combination with such a roll, in which the roll has bands of adhering material injected or otherwise forced into the roll in spaced locations along the rolls width. The adhering material interconnects the overlapped layers within the roll and is sufficiently strong to hold the grid material in the rolled configuration for transport and storage, and yet is readily pulled apart in response to sufficient manual or mechanical pressure applied against the roll, or tension applied to the unwound portion thereof, so as to enable the grid material to be incrementally unwound and installed in the mine. The rolls can be installed using a range of mining machines without need for any specialized dispensing or other apparatus mounted on the machine and without the need for any mechanical device to control unwinding.

Tensar Corporation | Date: 2016-06-08

plastic sheet materials for construction; soil reinforcement mesh and soil stabilization mesh made of plastic; soil erosion control structures, namely, gabions and mattresses constructed of plastic mesh; plastic mesh material for construction of civil engineering structures; plastic mesh materials for asphalt and concrete reinforcement, and construction of civil engineering structures.

Tensar Corporation | Date: 2016-02-16

Handheld tensioning device, namely, leverageable tool for use with retaining walls for earth retention.

Discover hidden collaborations