矿物外加剂对花岗岩制砂砂浆中碱-硅反应的影响

IF 1.7 4区 工程技术 Q3 ENGINEERING, CIVIL
Yunda Lin, Chenghua Bin, Facai Su, Yuanfeng Chen, Hongliu Rong, Ying Huang
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引用次数: 0

摘要

花岗岩机制砂混凝土中碱硅反应(ASR)的发生会降低其耐久性和使用寿命。然而,不同矿物掺合料对抑制花岗岩机制砂混凝土中 ASR 的组合和影响,以及对其抑制机理的深入理解仍有待进一步探索。因此,本研究据此分析了花岗岩机制砂的碱活性,并选择了活性较高的骨料,研究了粉煤灰(FA)、硅灰(SF)和矿渣(BS)矿物掺合料单独或共同使用时对砂浆中 ASR 发生的抑制作用及其最佳用量,并通过 XRD 和 SEM 观察分析,探讨了矿物掺合料抑制花岗岩机制砂砂浆试件中 ASR 的机理。结果表明花岗岩机制砂混凝土中存在过量的 ASR 膨胀,当活性砂的含量最不利时,砂浆试件中的 ASR 强度最大,相应的膨胀率也最大;反之,砂浆中的 ASR 强度减弱,膨胀率降低;控制胶凝体系中碱和活性集料的含量,避开最不利的比例,可减轻 ASR 的影响;FA、SF 和 BS 的最佳含量分别为 30%、20% 和 5%;当 5%的 SF 与 5%的 FA 或 5%的 BS 混合时,花岗岩制砂砂浆中的 ASR 得到了最有效的抑制;花岗岩制砂砂浆中 ASR 的抑制效果受活性组分含量以及所含外加剂颗粒细度的影响;活性组分含量越高,平均粒径越小,抑制效果越好。最后,研究表明,所考虑的外加剂可通过以下方式抑制 ASR:降低砂浆中的总碱含量,减缓 ASR 凝胶的形成;通过与氢氧化钙水泥水化产物的水胶化反应生成 C-S-H 凝胶,减少钾离子和钠离子与活性骨料接触的机会;改善界面过渡区的微观结构,使浆体结构致密化,从而阻碍碱向内部扩散。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Effects of Mineral Admixtures on the Alkali–Silica Reaction in Granite Manufactured Sand Mortar

Effects of Mineral Admixtures on the Alkali–Silica Reaction in Granite Manufactured Sand Mortar

The occurrence of the alkali–silica reaction (ASR) in granite manufactured sand concrete reduces its durability and service life. However, the combination and effect of different mineral admixtures on inhibiting ASR in granite-manufactured sand concrete and the in-depth understanding of the inhibition mechanism still need to be further explored. Therefore, this study accordingly analyzed the alkali activity of granite manufactured sand and the more active aggregates were selected to investigated the inhibitory effects of fly ash (FA), silica fume (SF), and slag (BS) mineral admixtures on the occurrence of ASR in mortar when used individually or together, as well as their optimal dosages; and XRD and SEM observations were analyzed to explore the mechanisms through which the mineral admixtures inhibited the ASR in the granite manufactured sand mortar specimen. The results indicate that: The existence of excessive ASR expansion in granite manufactured sand concrete, when the content of active sand was the most unfavorable, the ASR in the mortar specimen was the strongest and the corresponding expansion rate was the largest; otherwise, the intensity of the ASR in the mortar as weakened and the expansion rate was reduced; controlling the contents of alkali and active aggregates in the cementitious system to avoid the most detrimental proportions can alleviate the effects of ASR; the optimal contents of FA, SF, and BS individually were 30%, 20%, and 5%, respectively; and ASR was most effectively inhibited in the granite manufactured sand mortar when 5% SF was mixed with 5% FA or 5% BS; the inhibition of ASR in granite manufactured sand mortar is affected by the content of the active components as well as the particle fineness of the included admixture; the greater the content of active components, the smaller the average particle size and the better the inhibition effect. Finally, the considered admixtures were shown to inhibit ASR by reducing the total alkali content in the mortar and slowing the formation of ASR gel; generating C–S–H gel through the pozzolanic reaction with the calcium hydroxide cement hydration product, reducing the chances of contact between potassium and sodium ions and the active aggregate; and improving the microstructure of the interfacial transition zone and densifying the structure of the slurry, thereby impeding the diffusion of alkali to the interior.

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来源期刊
CiteScore
3.30
自引率
11.80%
发文量
203
期刊介绍: The aim of the Iranian Journal of Science and Technology is to foster the growth of scientific research among Iranian engineers and scientists and to provide a medium by means of which the fruits of these researches may be brought to the attention of the world’s civil Engineering communities. This transaction focuses on all aspects of Civil Engineering and will accept the original research contributions (previously unpublished) from all areas of established engineering disciplines. The papers may be theoretical, experimental or both. The journal publishes original papers within the broad field of civil engineering which include, but are not limited to, the following: -Structural engineering- Earthquake engineering- Concrete engineering- Construction management- Steel structures- Engineering mechanics- Water resources engineering- Hydraulic engineering- Hydraulic structures- Environmental engineering- Soil mechanics- Foundation engineering- Geotechnical engineering- Transportation engineering- Surveying and geomatics.
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