详情

RES2013-37: Performance Evaluation of Grout Materials for Connecting Precast Concrete Bridge Deck Panels

项目名称：	RES2013-37: Performance Evaluation of Grout Materials for Connecting Precast Concrete Bridge Deck Panels
摘要：	The use of full-depth precast concrete panels for rehabilitation of bridge decks allows fast installation and all-weather construction. The panel joints that are connected later with grout materials may degrade prematurely, leading to a less desirable composite action. As a result, testing of various types of grout materials is essential to establish the quality and the serviceability of grouts for TDOT. A variety of 25 prepackaged commercial grout products from 16 manufacturers across US were collected and evaluated in this study. Most grouts showed good flowability, adequate early-age and high 28-day compressive strength, and acceptable bond strength. While these properties were essential for the closure pour, the high dry shrinkage and the slow setting would be the major concerns for these products. In addition, most grout products showed medium to low permeability and high freeze and thaw durability. The surface moisture of substrate had noticeable effects on the flexural bond capacity of grout products. However, there was no clear trend and different products showed different results. In comparison, the surface moisture of substrate had less effect on the slant shear bond capacity. The temperature change had great impacts on the flowability, time of setting, compressive strength development, and bond capacity. Increasing temperature generally reduced the flowability of fresh grout. High temperature typically accelerated the setting of fresh grouts and increased the compressive strength of grouts. In a rare case, the grout showed a reduced compressive strength. Conversely, an increase in temperature mostly reduced the flexural and the slant shear bond strength. Only a few products first showed an increased bond strength. Adding steel fibers into the fresh grout mostly reduced its flowability, but some grouts showed no changes in flowability after the fiber addition and some grouts showed a slightly increased flowability. For most grout products, the steel fiber addition had positive effects on the compressive strength particularly at late ages; however, some products showed a reduced compressive strength especially at the early age. For grout products with high bond strength, adding 3% steel fibers normally caused a reduced bond strength. For grout products with low bond strength, the steel fiber addition significantly improved the bond strength.
状态：	Completed
资金：	96000
资助组织：	Tennessee Department of Transportation
执行机构：	Middle Tennessee State University, Murfreesboro
开始时间：	20130613
预计完成日期：	20190306
主题领域：	Bridges and other structures；Construction；Highways；Materials；Pavements