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首页> 外文会议>Airfield and Highway Pavement Specialty Conference; 20060430-0503; Atlanta,GA(US) >A CASE STUDY EVALUATING THE USE OF LITHIUM NITRATE TO ARREST ALKALI-SILICA REACTION IN AN EXISTING CONCRETE PAVEMENT
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A CASE STUDY EVALUATING THE USE OF LITHIUM NITRATE TO ARREST ALKALI-SILICA REACTION IN AN EXISTING CONCRETE PAVEMENT

机译：评估在现有混凝土路面中使用硝酸锂阻止碱-硅石反应的案例研究

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摘要

Presented herein are findings from a three-year field trial in which lithium nitrate was applied at a rate of 0.006 gal per square foot, twice a year, on an existing concrete pavement in Norfolk, Nebraska, in the attempt to arrest on-going alkali-silica reaction (ASR) distress. Various destructive and non-destructive means were utilized to measure the effectiveness of the lithium treatments. Concrete cylinders were cored for petrographic examination and split-tension testing. Powder samples were taken to determine the lithium content of the concrete pavement. Nondestructive evaluations included the use of crack mapping, a Schmidt hammer, a velocity ("V") meter, and an impact echo apparatus. The results to date have not shown definitive benefits of the lithium material in arresting the ASR process; however, the observed lithium penetration and resulting concentrations by gravity soaking has been very limited. Presumably the pavement has not reached the deterioration state for optimal permeability for penetration of the lithium material into the concrete mass. Other application techniques on hardened concrete such as surface pressurization and vacuum impregnation were investigated to a limited extent as alternate methods to gravity soaking. The surface pressurization technique produced promising results in so far as achieving higher lithium concentrations. Effort is now needed in achieving higher lithium concentrations on a larger scale so that a more realistic evaluation of the effects of the lithium treatment can be performed.
机译：本文提供的是一项为期三年的现场试验的发现，该试验在内布拉斯加州诺福克的现有混凝土路面上，以每平方英尺0.006加仑的速率，每年两次以硝酸锂的施用量，试图阻止持续的碱-二氧化硅反应（ASR）困扰。各种破坏性和非破坏性手段被用来测量锂处理的有效性。混凝土圆柱体进行了岩心检查和拉力测试。取粉末样品以确定混凝土路面的锂含量。无损评估包括使用裂缝映射，施密特锤，速度（“ V”）计和冲击回波仪。迄今为止的结果尚未显示出锂材料在阻止ASR工艺方面的明确益处。然而，通过重力浸泡观察到的锂渗透和所产生的浓度非常有限。为了使锂材料渗透到混凝土中，最佳的渗透性可能是路面未达到劣化状态。作为对重力浸泡的替代方法，在有限的范围内研究了其他在硬化混凝土上的应用技术，例如表面加压和真空浸渍。就达到更高的锂浓度而言，表面加压技术产生了可喜的结果。现在需要努力以更大的规模获得更高的锂浓度，以便可以对锂处理的效果进行更实际的评估。

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