Calcined nanosized tubular halloysite for the preparation of limestone calcined clay cement (LC3)

doi:10.1016/j.clay.2022.106795

	Yu, Ting 1,2; Zhang, Baifa 3; Guo, Haozhe 4; Wang, Qiang1,2 ; Liu, Dong1,2 ; Chen, Jiarong 1,2; Yuan, Peng1,3
	Calcined nanosized tubular halloysite for the preparation of limestone calcined clay cement (LC3)
Source Publication	APPLIED CLAY SCIENCE
ISSN	0169-1317
	2023-02-01
Volume	232 Pages:11
DOI	10.1016/j.clay.2022.106795
Language	英语
WOS Research Area	Chemistry ; Materials Science ; Mineralogy
Abstract	Halloysite is a kind of 1:1 clay mineral having a special nanosized tubular morphology and pore structure. In this work, nanosized tubular halloysite calcined at 750 degrees C (Hal750) and limestone (LS) were used to partially replace the ordinary Portland cement (OPC) for the preparation of limestone calcined clay cement (LC3). The mechanical properties and microstructure of LC3 were studied. The results revealed that the obtained LC3 had higher early compressive strengths on 3 and 7 days than did plain OPC. LC3 with a replacement ratio of 22.5% (containing 15.0% Hal750 and 7.5% LS) resulted in maximum compressive strength of 46.38 MPa, being 9.4% higher than OPC's after 28 days of curing. Further, LC3 featured a compact microstructure and smaller critical pore size than OPC, which is mainly because more additional C-(A)-S-H, hemicarboaluminate (Hc), and monocarboaluminate (Mc) were formed in LC3 system, thus contributing to the matrix densification and strength development. However, when the replacement ratio exceeded 37.5%, the insufficient portlandite (CH) limited the pozzolanic reaction with Hal750, leaving excess Hal750 in the LC3 that led to their inhomogeneous microstructure, and thus weakened the mechanical properties. These results show that halloysite is a promising material for the prepa-ration of LC3 whose properties are sensitive to the replacement ratio used.
Keyword	Halloysite Limestone Limestone calcined clay cement (LC 3 ) Microstructure Supplementary cementitious materials (SCMs)
WOS ID	WOS:000916428300001
Indexed By	SCI
Citation statistics	Cited Times:15[WOS] [WOS Record] [Related Records in WOS]
Document Type	期刊论文
Identifier	http://ir.gig.ac.cn/handle/344008/72550
Collection	中国科学院矿物学与成矿学重点实验室
Corresponding Author	Yuan, Peng
Affiliation	1.Chinese Acad Sci, Inst Earth Sci, Guangzhou Inst Geochem, CAS Key Lab Mineral & Metallogeny,Guangdong Prov K, Guangzhou 510640, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Guangdong Univ Technol, Sch Environm Sci & Engn, Guangzhou 510006, Peoples R China 4.Guangdong Acad Sci, Inst Resources Utilizat & Rear Earth Dev, Guangzhou 510650, Peoples R China
Recommended Citation GB/T 7714	Yu, Ting,Zhang, Baifa,Guo, Haozhe,et al. Calcined nanosized tubular halloysite for the preparation of limestone calcined clay cement (LC3)[J]. APPLIED CLAY SCIENCE,2023,232:11.
APA	Yu, Ting.,Zhang, Baifa.,Guo, Haozhe.,Wang, Qiang.,Liu, Dong.,...&Yuan, Peng.(2023).Calcined nanosized tubular halloysite for the preparation of limestone calcined clay cement (LC3).APPLIED CLAY SCIENCE,232,11.
MLA	Yu, Ting,et al."Calcined nanosized tubular halloysite for the preparation of limestone calcined clay cement (LC3)".APPLIED CLAY SCIENCE 232(2023):11.

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