Multi-factor correlation analysis and evaluation of properties of thermal cement mortars mixed with iron sand(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2017年02期
- Page:
- 9-17
- Research Field:
- 道路工程
- Publishing date:
Info
- Title:
- Multi-factor correlation analysis and evaluation of properties of thermal cement mortars mixed with iron sand
- Author(s):
- LIU Kai; REN Jing-ge; WANG Fang; WANG Zhi; LU Xue-yuan; JIN Can
- 1. School of Transportation Engineering, Hefei University of Technology, Hefei 230009, Anhui, China; 2. School of Civil Engineering, Anhui Jianzhu University, Hefei 230601, Anhui, China; 3. Anhui Transportation Holding Group Co., Ltd., Hefei 230088, Anhui, China
- Keywords:
- road engineering; thermal cement mortar mixed with iron sand; thermal conductivity; mechanical property; gray correlation analysis
- PACS:
- U414
- DOI:
- -
- Abstract:
- In order to study the influence of grading factors on properties of thermal cement mortars mixed with iron sand, and choose proper gradation composition according to different application fields, this paper respectively analyzed the effects of water-cement ratio, total sand-cement ratio and iron sand-total sand ratio on thermal conductivity, flexural strength and compressive strength of thermal cement mortars mixed with iron sand through thermal conductivity test, flexural strength test and compressive strength test. Correlations between the three factors and thermal conductivity, flexural strength and compressive strength were calculated with gray correlation theory. Comprehensive performance of fifteen kinds of gradation composition were evaluated based on gray target theory, and comprehensive performance evaluation methods of different gradation compositions were reproposed based on four evaluation index weights, such as thermal conductivity, flexural strength, compressive strength and material price, as well as gradation composition of the best comprehensive performance was suggested when thermal cement mortars mixed with iron sand used in melting snow and ice road, deck and chemical industrial field of thermal conductivity. The results show that thermal conductivity, flexural strength and compressive strength of thermal cement mortars mixed with iron sand all decrease with the increase of water-cement ratio. Thermal conductivity increases with the increase of total sand-cement ratio, and flexural strength and compressive strength of thermal cement mortars mixed with iron sand reach to the best when total sand-cement ratio is 2.5. Content of iron sand, thermal conductivity and flexural strength all increase with the increase of iron sand-total sand ratio, and compressive strength achieves the best when iron sand-total sand ratio is 0.6. Thermal conductivity is significantly influenced by iron sand-total sand ratio, flexural strength is significantly influenced by water-cement ratio, compressive strength is significantly influenced by both water-cement ratio and iron sand-total sand ratio. While total sand-cement ratio has little influence on performance of thermal cement mortars mixed with iron sand. The research results provide a theoretical guidance to choose appropriate proportion for practical application.
Last Update: 2017-04-07