[1]张立明 江羽习 李育林 张媛媛.粉煤灰掺量对混凝土抗硫酸镁侵蚀的影响[J].大众科技,2020,22(11):35-39.
　Effect of fly Ash Content on Concrete Resistance to Magnesium Sulfate Erosion[J].Popular Science & Technology,2020,22(11):35-39.
点击复制

粉煤灰掺量对混凝土抗硫酸镁侵蚀的影响()
分享到：

《大众科技》[ISSN:1008-1151/CN:45-1235/N]

卷:
22
期数:
2020年11
页码:
35-39
栏目:
建设与工程
出版日期:
2020-11-20

文章信息/Info

Title:
Effect of fly Ash Content on Concrete Resistance to Magnesium Sulfate Erosion
作者:
张立明 江羽习 李育林 张媛媛
（广西路建工程集团有限公司，广西 南宁 530001）
关键词:
硫酸镁侵蚀; 粉煤灰; 混凝土; 微观分析
Keywords:
magnesium sulfate erosion fly ash concrete micro analysis
文献标志码:
A
摘要:
以10%MgSO4溶液为侵蚀介质，采用干湿交替法对不同掺量粉煤灰混凝土进行耐久性试验，并借助X射线衍射（XRD）和扫描电子显微镜（SEM）对其微观形貌进行观察与分析。结果表明，增加适量的粉煤灰掺量有助于提高混凝土的抗MgSO4的侵蚀能力，在干湿循环次数80次以内，粉煤灰的最佳掺量为10%；干湿循环次数在80次～120次之间时，粉煤灰的最佳掺量为30%。随着干湿循环次数的增加，钙矾石和C-S-H发生脱钙反应，CaSO4以及水镁石的形成加快，混凝土空隙被腐蚀物填满，强度急剧下降。
Abstract:
Taking 10% MgSO4 solution as erosive medium, the durability test of concrete with different fly ash content was carried out by dry wet alternate method. Then the micro-structure of concrete was observed and analyzed by X-ray diffraction (XRD) and scanning electron microscope (SEM). The results show that concrete resistance to MgSO4 erosion will be improve by adding proper amount of fly ash. The number of dry and wet cycles is less than 80 times, the optimum content of fly ash is 10% and the number of dry and wet cycles is between 80~120 times, the optimum content of fly ash is 30%. With the increase of dry and wet cycles, ettringite and C-S-H are decalcified, the formation of CaSO4 and brucite accelerates, the concrete void is filled with corrosion, and the strength decreases sharply.

参考文献/References:

[1] 张誉，蒋利学，张伟平，等. 混凝土结构耐久性概论[M].上海: 上海科学技术出版社，2003. [2] Monteir P J M, Kurtis K E. Time to failure for concrete exposed to severe sulfate attack[J]. Cement and Concrete Research, 2003, 33(7): 987-993. [3] Yu H F, Tan Y S, Yang L M. Microstructural evolution of concrete under the attack of chemical, salt crystallization, and bending stress[J]. Journal of Materials in Civil Engineering, 2017, 29(7): 401-407. [4] Ma H, Gong W, Yu H, et al. Durability of concrete subjected to dry-wet cycles in various types of Salt Lake brines[J]. Construction and Building Materials, 2018, 193(30): 286, 294. [5] Scarfato P, Di M L, Fariello M L, et al. Preparation and evaluation of polymer/clay nanocomposite surface treatments for concrete durability enhancement[J]. Cement and Concrete Composites, 2012, 34(3): 297-305. [6]　Hackman I, Hollaway L. Epoxy-layered silicate nanocomposites in civil engineering [J]. Composites Part A: Applied Science and Manufacturing, 2006, 37(8): 1161-1170. [7] 李永靖，岳玮琦，潘铖，等. 煤矸石集料混凝土Na2SO4侵蚀试验研究[J]. 硅酸盐通报，2018，37(8): 2675-2680. [8] 于本田，王起才，周立霞，等. 矿物掺合料与水胶比对混凝土耐久性的影响研究[J]. 硅酸盐通报，2012，31(2): 391-395，410. [9] 杜健民，陈耀，于贵霞，等. 吸附区粉煤灰混凝土抗硫酸盐腐蚀性能研究[J]. 中国矿业大学学报，2014，43(4): 600-605. [10] Lee S T，Moon H Y , Hotton R D , et al. Effects of solution concentrations and replacement levels of metakaolin on the resistance of mortars exposed to magnesium sulfate solutions[J]. Cement and Concrete Research, 2005, 35: 1314-1323. [11] Omar S. Al-Amoudi B. Attack on plain and blended cements exposed to aggressive sulfate environments[J]. Cement and Concrete Composites, 2002, 24: 305-316. [12] Moon H Y, Lee S T, Kim S S. Sulphate resistance of silica fume blended mortars exposed to various sulphate solution[J]. Canadian Journal of Civil Engineering, 2003, 30(4): 625-636.

相似文献/References:

[1]黎君君 黎 福.高性能粉煤灰混凝土抗冻性试验分析[J].大众科技,2023,25(11):49.
　Experimental Analysis of Frost Resistance on High Performance Fly Ash Concrete[J].Popular Science & Technology,2023,25(11):49.

备注/Memo

备注/Memo:
【收稿日期】2020-09-11 【基金项目】南宁市科技项目“氧化石墨烯改性沥青及其混合料关键技术研究”（20201062）；南宁市兴宁区科技项目“低收缩抗裂钢渣路面基层材料的研究与应用”（2020A06）。 【作者简介】张立明（1978－），男，吉林九台人，广西路建工程集团有限公司高级工程师，技术中心主任，博士，研究方向为工业固废在筑路材料化资源化利用及混凝土结构耐久性。
更新日期/Last Update: 2020-12-16