Strength Characteristics and Microstructure of Cement Stabilized Soft Soil Admixed with Silica Fume

Autor:	Liu Yi'ao, Zeping Wang, Nan Jiang, Changming Wang, Bailong Li
Rok vydání:	2021
Předmět:	Materials science Curing (food preservation) silica fume Silica fume microstructure 0211 other engineering and technologies 02 engineering and technology lcsh:Technology Article cement stabilized soft soil chemistry.chemical_compound 021105 building & construction pore distribution Hydration reaction General Materials Science Composite material Calcium silicate hydrate lcsh:Microscopy unconfined compressive strength lcsh:QC120-168.85 021101 geological & geomatics engineering Cement lcsh:QH201-278.5 lcsh:T Pozzolan Microstructure Compressive strength chemistry lcsh:TA1-2040 lcsh:Descriptive and experimental mechanics lcsh:Electrical engineering. Electronics. Nuclear engineering lcsh:Engineering (General). Civil engineering (General) lcsh:TK1-9971
Zdroj:	Materials, Vol 14, Iss 1929, p 1929 (2021) Materials Volume 14 Issue 8
ISSN:	1996-1944
DOI:	10.3390/ma14081929
Popis:	Soft soil improvement is an important subject in civil engineering, and searching for an effective admixture is an important research. Silica fume (SF) is a kind of recycled material, it can be used in engineering as a pozzolanic material. The main objective of this study is to assess the effectiveness of industrial waste silica fume (SF) as an admixture to improve the cement stabilized soft soil. The unconfined compressive test (UCT) and scanning electron microscopy (SEM) test of cement stabilized soil with different SF contents and different curing times have been carried out. UCT after 28 days revealed that the addition of SF can effectively increase the strength of cement stabilized soil and reduce the amount of cement, and 1.5% SF content is considered optimum, excessive SF will not further increase the strength. SF helped to accelerate the cement hydration reaction and significantly improve the early-age strength of stabilized soil even at 3 days, which can improve construction efficiency in actual projects. SEM analyses shows that the proper SF content could make the hydration product calcium silicate hydrate gel (CSH) fill the pores and increase the strength of the material, but excessive SF will increase the large pores content of the material and reduce the strength. This provided a basis for application of SF in improving soft soil.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ca414f60850089287a6ddadec38d8b58 https://doi.org/10.3390/ma14081929 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
Nepřihlášeným uživatelům se plný text nezobrazuje	K zobrazení výsledku je třeba se přihlásit.