PMID- 34063268 OWN - NLM STAT- PubMed-not-MEDLINE LR - 20210605 IS - 2073-4360 (Electronic) IS - 2073-4360 (Linking) VI - 13 IP - 9 DP - 2021 May 2 TI - Effect of Elevated Temperature on Mechanical Properties of High-Volume Fly Ash-Based Geopolymer Concrete, Mortar and Paste Cured at Room Temperature. LID - 10.3390/polym13091473 [doi] LID - 1473 AB - This paper presents results from experimental work on mechanical properties of geopolymer concrete, mortar and paste prepared using fly ash and blended slag. Compressive strength, splitting tensile strength and flexural strength tests were conducted on large sets of geopolymer and ordinary concrete, mortar and paste after exposure to elevated temperatures. From Thermogravimetric analyzer (TGA), X-ray diffraction (XRD), Scanning electron microscope (SEM) test results, the geopolymer exhibits excellent resistance to elevated temperature. Compressive strengths of C30, C40 and C50 geopolymer concrete, mortar and paste show incremental improvement then followed by a gradual reduction, and finally reach a relatively consistent value with an increase in exposure temperature. The higher slag content in the geopolymer reduces residual strength and the lower exposure temperature corresponding to peak residual strength. Resistance to elevated temperature of C40 geopolymer concrete, mortar and paste is better than that of ordinary concrete, mortar and paste at the same grade. XRD, TGA and SEM analysis suggests that the heat resistance of C-S-H produced using slag is lower than that of sulphoaluminate gel (quartz and mullite, etc.) produced using fly ash. This facilitates degradation of C30, C40 and C50 geopolymer after exposure to elevated temperatures. FAU - Zhao, Jun AU - Zhao J AUID- ORCID: 0000-0001-8893-2694 AD - School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, China. AD - School of Mechanics and Safety Engineering, Zhengzhou University, Zhengzhou 450001, China. FAU - Wang, Kang AU - Wang K AD - School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, China. FAU - Wang, Shuaibin AU - Wang S AD - School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, China. FAU - Wang, Zike AU - Wang Z AD - School of Mechanics and Safety Engineering, Zhengzhou University, Zhengzhou 450001, China. FAU - Yang, Zhaohui AU - Yang Z AD - School of Mechanical and Materials Engineering, Washington State University, Pullman, WA 99164, USA. FAU - Shumuye, Eskinder Desta AU - Shumuye ED AUID- ORCID: 0000-0003-1546-0520 AD - School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, China. FAU - Gong, Xinglong AU - Gong X AD - School of Mechanics and Safety Engineering, Zhengzhou University, Zhengzhou 450001, China. AD - CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern Mechanics, University of Science and Technology of China, Hefei 230027, China. LA - eng PT - Journal Article DEP - 20210502 PL - Switzerland TA - Polymers (Basel) JT - Polymers JID - 101545357 PMC - PMC8125026 OTO - NOTNLM OT - elevated temperature exposure OT - fly ash and slag blend OT - geopolymer OT - mechanical properties OT - micro-structure COIS- The authors declare no conflict of interest. EDAT- 2021/06/03 06:00 MHDA- 2021/06/03 06:01 PMCR- 2021/05/02 CRDT- 2021/06/02 01:06 PHST- 2021/04/09 00:00 [received] PHST- 2021/04/26 00:00 [revised] PHST- 2021/04/28 00:00 [accepted] PHST- 2021/06/02 01:06 [entrez] PHST- 2021/06/03 06:00 [pubmed] PHST- 2021/06/03 06:01 [medline] PHST- 2021/05/02 00:00 [pmc-release] AID - polym13091473 [pii] AID - polymers-13-01473 [pii] AID - 10.3390/polym13091473 [doi] PST - epublish SO - Polymers (Basel). 2021 May 2;13(9):1473. doi: 10.3390/polym13091473.