Reliability of Foam Concrete in Cold and Drought Environment of Northwest China

Abstract

Abstract: In order to study the actual service life of foam concrete in the cold and drought areas of Northwest China, 4 types of foam concrete with different mix ratios were designed. After standard curing for 28 d, the benchmark parameters were analyzed.Based on the field exposure test, the dynamic elastic modulus and quality of foam concrete were regularly nondestructively tested.And the damage mechanism and durability degradation process of specimens were analyzed from both macro and micro aspects based on the benchmark parameters of specimens. Finally, a life model was established through the Wiener degradation process. The results show that the strength, drying shrinkage and pore structure of foam concrete are related to the factors such as bulk density and cement content, and appropriate amount of slag and fly ash can optimize the pore structure of foam concrete and improve its durability. Under the combined effects of climatic environment and corrosive ions, the dynamic elastic modulus and quality evaluation parameters of 4 types of specimens all increase first and then decrease, and show different degrees of durability damage. The service lives of 4 types of specimens obtained by using the dynamic elastic modulus evaluation parameter as the durability degradation index of foam concrete are about 12 800 d, 14 100 d, 17 600 d and 16 000 d, respectively, and the lives obtained by using the quality evaluation parameter as the index are about 13 800 d, 15 000 d, 19 600 d and 16 000 d, respectively. The dynamic elastic modulus is more sensitive to the durability change of foam concrete.Comprehensively, when the amounts of cement, slag, fly ash lime and gypsum mixed in the foam concrete are 40.0%, 32.5%, 21.7%, 4.2%, 1.6% (mass fraction), the durability of specimens in the actual environment is better.

Key words: cold and drought environment, foam concrete, reliability, dynamic elastic modulus, quality

CLC Number:

TU528

LYU Xiangyu, ZHANG Shimin, SHI Fuzhou, LIU Wuwen, DING Wenhai. Reliability of Foam Concrete in Cold and Drought Environment of Northwest China[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(9): 2956-2963.

References

[1] 宋强,张鹏,鲍玖文,等.泡沫混凝土的研究进展与应用[J].硅酸盐学报,2021,49(2):398-410.
SONG Q, ZHANG P, BAO J W, et al. Research progress and application of foam concrete[J]. Journal of the Chinese Ceramic Society, 2021, 49(2): 398-410 (in Chinese).
[2] 竺万发,张业红,苏英,等.我国泡沫混凝土的研究进展及工程应用[J].材料导报,2013,27(s1):317-320.
ZHU W F, ZHANG Y H, SU Y, et al. Study progress and engineering applications of foamed concrete in China[J]. Materials Review, 2013, 27(s1): 317-320 (in Chinese).
[3] 方永浩,王锐,庞二波,等.水泥-粉煤灰泡沫混凝土抗压强度与气孔结构的关系[J].硅酸盐学报,2010,38(4):621-626.
FANG Y H, WANG R, PANG E B, et al. Relationship between compressive strength and air-void structure of foamed cement-fly ash concrete[J]. Journal of the Chinese Ceramic Society, 2010, 38(4): 621-626 (in Chinese).
[4] LIU M Y J, ALENGARAM U J, JUMAAT M Z, et al. Evaluation of thermal conductivity, mechanical and transport properties of lightweight aggregate foamed geopolymer concrete[J]. Energy and Buildings, 2014, 72: 238-245.
[5] 中华人民共和国住房和城乡建设部.泡沫混凝土:JG/T 266—2011[S].北京:中国标准出版社,2011.
Ministry of Housing and Urban-Rural Development of the People's Republic of China. Foam concrete: JG/T 266—2011[S]. Beijing: Standards Press of China, 2011 (in Chinese).
[6] 赵进,徐俊伟,石芳婷,等.预拌现浇泡沫混凝土的制备及其性能[J].安徽工业大学学报(自然科学版),2020,37(1):87-93.
ZHAO J, XU J W, SHI F T, et al. Preparation of ready mixed cast-in-place foam concrete and its properties[J]. Journal of Anhui University of Technology (Natural Science), 2020, 37(1): 87-93 (in Chinese).
[7] VISAGIE M, KEARSLEY E. Properties of foamed concrete as influenced by air-void parameters[J]. Concr Beton, 2002, 101: 8-14.
[8] GONG J Q, ZHANG W J. The effects of pozzolanic powder on foam concrete pore structure and frost resistance[J]. Construction and Building Materials, 2019, 208: 135-143.
[9] 李从波,文梓芸,殷素红.大型承重保温夹芯复合墙体的材料选型及模拟[J].建筑材料学报,2013,16(6):1012-1016.
LI C B, WEN Z Y, YIN S H. Material selection and simulation research of large bearing insulation sandwich composite wall[J]. Journal of Building Materials, 2013, 16(6): 1012-1016 (in Chinese).
[10] TIKALSKY P J, POSPISIL J, MACDONALD W. A method for assessment of the freeze-thaw resistance of preformed foam cellular concrete[J]. Cement and Concrete Research, 2004, 34(5): 889-893.
[11] 郭雷,关辉,杨学春.甲基硅烷类防水剂对泡沫混凝土抗冻性的影响[J].哈尔滨工程大学学报,2018,39(12):2075-2079.
GUO L, GUAN H, YANG X C. Effect of methylsilane waterproof agent on frost resistance of foam concrete[J]. Journal of Harbin Engineering University, 2018, 39(12): 2075-2079 (in Chinese).
[12] 吴雨明.基于冻融循环条件下泡沫混凝土的试验性能研究及应用[D].淮南:安徽理工大学,2019.
WU Y M. Research and application of foam concrete's experimental performance based on freeze-thaw cycle conditions[D]. Huainan: Anhui University of Science & Technology, 2019 (in Chinese).
[13] 杨杰.磷石膏矿渣泡沫混凝土的制备及抗碳化性能优化研究[D].武汉:武汉理工大学,2018.
YANG J. Preparation of phosphogypsum slag foamed concrete and optimization of anti-carbonization performance[D]. Wuhan: Wuhan University of Technology, 2018 (in Chinese).
[14] AHMAD S. Reinforcement corrosion in concrete structures, its monitoring and service life prediction: a review[J]. Cement and Concrete Composites, 2003, 25(4/5): 459-471.
[15] 汪金花,曹兰杰,徐国强,等.混凝土硫酸钠腐蚀产物的高光谱检测方法研究[J].光谱学与光谱分析,2019,39(6):1724-1730.
WANG J H, CAO L J, XU G Q, et al. Hyperspectral detection method of concrete sodium sulfate corrosion products[J]. Spectroscopy and Spectral Analysis, 2019, 39(6): 1724-1730 (in Chinese).
[16] ZHAO H, XIONG R, GUAN B W. Fatigue damage property of cement concrete under magnesium sulfate corrosion condition[J]. Applied Mechanics and Materials, 2014, 638/639/640: 1153-1157.
[17] 彭宝华.基于Wiener过程的可靠性建模方法研究[D].长沙:国防科学技术大学,2010.
PENG B H. Research on reliability modeling methods based on Wiener process[D]. Changsha: National University of Defense Technology, 2010 (in Chinese).
[18] HU Y G, LI H, SHI P P, et al. A prediction method for the real-time remaining useful life of wind turbine bearings based on the Wiener process[J]. Renewable Energy, 2018, 127: 452-460.
[19] 冯海林,李秀秀.基于随机效应Wiener退化模型的剩余寿命预测[J].浙江大学学报(理学版),2018,45(6):679-683+693.
FENG H L, LI X X. Residual life prediction based on a stochastic effect Wiener degradation model[J]. Journal of Zhejiang University (Science Edition), 2018, 45(6): 679-683+693 (in Chinese).
[20] 中华人民共和国住房和城乡建设部.普通混凝土长期性能和耐久性能试验方法标准:GB/T 50082—2009[S].北京:中国建筑工业出版社,2010.
Ministry of Housing and Urban-Rural Development of the People's Republic of China. Standard for test methods of long-term performance and durability of ordinary concrete: GB/T 50082—2009[S]. Beijing: China Architecture & Building Press, 2010 (in Chinese).