| 摘要: |
| 利用快速砂浆棒法（AMBT）来评价Li2CO3和硝酸盐AN 1抑制碱硅酸反应（ASR）的能力，并且通过长期碱液高温浸泡试验方法（3a浸泡期）来确定上述2种化学外加剂对ASR抑制能力的真实性，同时对比了相同掺量的单掺矿物掺和料(SCM)砂浆棒对ASR的抑制效果.结果表明：在短期试验中，AN 1+SCM组合、Li2CO3+SCM组合和单掺SCM这3组抑制材料均能有效抑制ASR且满足AMBT规范的评定标准，其中，AN 1+SCM组合的短期抑制能力与单掺SCM时基本相同，但优于Li2CO3+SCM组合；在长期试验中，AN 1+SCM组合与Li2CO3+SCM组合的长期抑制效果显著，且优于单掺SCM时，其中，Li2CO3+SCM组合的M2砂浆棒（胶材为P·O 42.5水泥，SCM为10%粉煤灰+20%磨细矿渣）对ASR的抑制效果最佳；在AN 1+SCM组合中，AN 1的掺量阈值建议取水泥质量的075%～125%. |
| 关键词: 碱硅酸反应 抑制 Li2CO3 硝酸盐 快速砂浆棒法 长期碱液浸泡 |
| DOI：103969/j.issn.1007 9629201801001 |
| 分类号: |
| 基金项目:国家重点基础研究发展计划(973计划)资助项目(2015CB655102)；国家自然科学基金资助项目(51608512)；中国科学院西部之光基金资助项目(2014) |
|
| Long Term Inhibition Capability of Alkali Silica Reaction(ASR) by Li2CO3 and AN 1 with Method of Accelerated Mortar Bars Test |
|
GAO Peng1, YU Hongfa1, LI Ying2, WEN Jing2, ZANG Yamei3
|
|
1.Department of Civil Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;2.Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China;3.Department of Sources and Civil Engineering, Tibet University, Lhasa 850000, China
|
| Abstract: |
| Supplementary cementitious materials(SCM) or chemical admixtures(CA) blended in binder can mitigate the expansions due to alkali silica reaction(ASR) effectually. The factual effects of Li2CO3 or nitrate AN 1 against ASR were detected by means of long term alkali immersion at high temperature, and the inhibiting capacities of Li2CO3 or AN 1 were evaluated by accelerated mortar bars test(AMBT). AN 1 is nitrate, a new CA at a low price. In addition, the expansions of mortar bars blended with SCM only during the long term test were compared with those of Li2CO3 or AN 1 The results obtained are shown that, the three groups of mortar bars, including AN 1+SCM group, Li2CO3+SCM group and solo SCM group, exhibit good inhibition effect during AMBT which meets the discriminant criteria on qualified ASR inhibition of AMBT. Among the short term expansions of these three groups of mortar bars, the expansions of AN 1+SCM group as are same low as those of only SCM group, which are lower than the Li2CO3+SCM groups. However, during the long term test, the AN 1+SCM group and Li2CO3+SCM group exhibit outstanding inhibition which is still maintained at low expansions, while the single SCM group does not. Among the long term expansions of these three groups, the expansions of M2 mortar bars blended with Li2CO3+SCM are the lowest. Finally, the optimum AN 1 content in AN 1+SCM group is obtained and the threshold range of AN 1 content is recommended to take 075%125% by the mass of cement. |
| Key words: alkali silica reaction(ASR) inhibition Li2CO3 nitrate accelerated mortar bars test(AMBT) long term alkali lye immersion |
