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Selected Studies of the Durability of Fly-Ash-Based Geopolymer Concretes

机译：粉煤灰基地聚合物的耐久性研究选集

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摘要

The study reported herein investigates the performance of fly-ash-based geopolymer concretes (FA-GPC) when subjected to various durability tests. The durability of FA-GPC was examined for alkali silica reaction (ASR), chloride induced corrosion, carbonation, and sulfate attack. The ASR in FA-GPC was analyzed for three types of reactive aggregates (siliceous limestone, sandstone, and quartz). The effect of the ASR on FA-GPC was found to depend on the calcium contents of the fly ash (FA). FA-GPC made using Class F FA were found to be less vulnerable to ASR as compared with specimens made using Class C FA. Measured values of expansion were below the 0.1 % limit specified by ASTM C1260 [2007, "Standard Test Method for Potential Alkali Reactivity of Aggregates (Mortar-Bar Method)," Annual Book of ASTM Standards, ASTM International, West Conshohocken, PA] for all FA-GPC specimens. FA-GPC specimens made from Class F FA exhibited lower corrosion rates and porosity compared to their Class C FA-GPC and OPC counterparts. Overall, FA-GPC specimens showed limited signs of leaching or corrosion product formation, while OPC specimens exhibited the formation of multiple corrosion products along with significant leaching. Carbonation studies on FA-GPCs prepared with Class C and F FA suggested that carbonation had limited effect on geopolymer binders as rates were well below the threshold for initiation of corrosion. In addition, durability tests were performed on the effect of external sulfate attack on geopolymer concrete using calcium, sodium, and magnesium sul-fates. The sulfate ingress treatment was accelerated using applied electro kinetics by applying a constant current density of 1 A/m~2 for 1 week. A decrease in compressive strength was observed due to sodium and magnesium sulfates, while an increase was observed in the case of the calcium sulfates. Geopolymer concrete mortars and pastes perform satisfactorily when exposed to the three sulfate sources, but did not outmatch the performance of OPC Type Ⅴ cements.
机译：本文报道的研究调查了飞灰基地质聚合物混凝土（FA-GPC）在经受各种耐久性测试后的性能。对FA-GPC的耐久性进行了碱硅石反应（ASR），氯化物诱导的腐蚀，碳化和硫酸盐侵蚀。分析了FA-GPC中三种类型的反应性骨料（硅质石灰石，砂岩和石英）的ASR。发现ASR对FA-GPC的影响取决于飞灰（FA）的钙含量。与使用C类FA制造的标本相比，发现使用F类FA制造的FA-GPC对ASR的抵抗力较小。膨胀的测量值低于ASTM C1260 [2007，骨料潜在碱反应性的标准测试方法（砂浆-棒法），ASTM标准的年度手册，ASTM International，West Conshohocken，PA]指定的0.1％限值以下。所有FA-GPC标本。与C类FA-GPC和OPC同类产品相比，由F类FA制成的FA-GPC标本显示出较低的腐蚀速率和孔隙率。总体而言，FA-GPC样品显示出有限的浸出或腐蚀产物形成迹象，而OPC样品则显示出多种腐蚀产物的形成以及明显的浸出。用C类和FFA制备的FA-GPC的碳酸化研究表明，碳酸化对地聚合物粘合剂的作用有限，因为速率远低于引发腐蚀的阈值。此外，还使用钙，钠和镁硫酸盐对硫酸盐对地质聚合物混凝土的外部硫酸盐侵蚀的影响进行了耐久性测试。通过施加1 A / m〜2的恒定电流密度1周，使用施加的电动力学来加速硫酸盐的进入处理。由于硫酸钠和硫酸镁，观察到抗压强度降低，而对于硫酸钙，观察到抗压强度增加。当暴露于三种硫酸盐源时，地聚合物混凝土砂浆和浆糊的性能令人满意，但与OPCⅤ型水泥的性能不相上下。

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  • 来源
    《Geopolymer binder systems》|2012年|144-164|共21页
  • 会议地点 San Diego CA(US)
  • 作者

    Kunal Kupwade-Patil; Erez N. Allouche; Courtney Alyssa Watts; Md. Sufian Badar;

  • 作者单位

    Alternative Cementitious Binders Laboratory, Dept. of Civil Engineering, Louisiana Tech Univ., Ruston, LA 71272, United States of America;

    Civil Engineering, Director, Alternative Cementitious Binders Laboratory, Dept. of Civil Engineering, Louisiana Tech Univ., Ruston, LA 71272, United States of America;

    Alternative Cementitious Binders Laboratory, Louisiana Tech Univ., Ruston, LA 71272, United States of America;

    Alternative Cementitious Binders Laboratory, Dept. of Civil Engineering, Louisiana Tech Univ., Ruston, LA 71272, United States of America;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    durability; geopolymer concrete; corrosion; carbonation; sulfate attack;

    机译：耐久性地聚合物混凝土；腐蚀;碳化硫酸盐侵蚀;

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