Study on Influence Factors of Compressive Strength of Low Density Backfill Foamed Concrete Used in Natural Gas Pipeline Tunnel

Chunbao Li, Xiaotian Li, Di Guan, Shen Li, Wenpu Lv, Ziqin Cong, Valentina Y. Soloveva, Hojiboev Dalerjon, Pengju Qin and Xiaohui Liu
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Chunbao Li: College of Pipeline and Civil Engineering, China University of Petroleum (East China), Qingdao 266580, China
Xiaotian Li: College of Pipeline and Civil Engineering, China University of Petroleum (East China), Qingdao 266580, China
Di Guan: Construction Project Management Branch of China National Petroleum Pipeline Network Group Co., Ltd., Langfang 065001, China
Shen Li: Construction Project Management Branch of China National Petroleum Pipeline Network Group Co., Ltd., Langfang 065001, China
Wenpu Lv: Henan Huatai New Material Technology Corp. Ltd., Nanyang 473000, China
Ziqin Cong: College of Pipeline and Civil Engineering, China University of Petroleum (East China), Qingdao 266580, China
Valentina Y. Soloveva: Emperor Alexander I St. Petersburg State Transport University, 190031 St. Petersburg, Russia
Hojiboev Dalerjon: Mining-Metallurgical Institute of Tajikistan, Buston City 735730, Tajikistan
Pengju Qin: College of Civil Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Xiaohui Liu: Qingdao Urban Development Group Co., Ltd., Qingdao 266061, China

Sustainability, 2022, vol. 14, issue 14, 1-13

Abstract: Foamed concrete is mostly used for backfilling of long-distance tunnels and compressive strength is an important technical index to control the quality of foamed concrete. The influence factors on compressive strength of low-density foamed concrete were obtained by the single factor test method based on the targeted dry density and compressive strength. The results show that the HT composed of pollution-free animal protein oil and vegetable oil is an efficient foaming agent and can produce stable foams. The cementation ability of cement can be fully expressed when a water to cement ratio of 0.45~0.5 is employed, making foamed concrete have a compressive strength higher than 2 MPa. The foam content is inversely proportional to the compressive strength and dry density of foamed concrete, and the volume ratio of slurry to foam should be 2:1~3:1. The content of fly ash is also inversely proportional to the compressive strength but positively proportional to the dry density. When the content of admixture is 40~55%, the compressive strength of foamed concrete with low density is not less than 2 MPa. The mixing proportion can be changed in the reasonable range to meet the requirements of different projects.

Keywords: foamed concrete; low density; compressive strength; admixture; slurry–foam ratio; water–cement ratio (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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