不同 Zr02 摻量改性水泥鈣質(zhì)砂無(wú)側(cè)限抗壓特性研究
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中圖分類(lèi)號(hào)：TU43 文獻(xiàn)標(biāo)志碼：A 文章編號(hào)：1005-8249（2025）03-0013-06
DOI：10.19860/j.cnki.issn1005- 8249.2025.03.003
Abstract： To investigate the influence of nano zirconium dioxide （ ZrO2 ）dosage on the mechanical performance of cement - stabilized calcareous sand，prepared specimens of calcareous sand modified with varying proportions of nano Zr02 and evaluated their behavior using unconfined compresive strength tests.Theresults show thatthe stress-strain curves ofthenano ZrO2- cementcalcareoussand exhibitasoftening，hump－shapedprofile，withresidual stressesultimatelystabilizingataconstant level.Incorporation of nano ZrO2 led to increases in unconfined compressive strength of 101.1% ， 105.6% ，and 91.6% at curing ages of 7，14 and 28d ，respectively. Moreover， the compressive strength of the nano ZrO2 - cement calcareous sand demonstrated greater sensitivity to curing age compared to plain cement calcareous sand.The adition of nano Zr02 also significantly enhancedthedeformationmodulusofthespecimens，improvingtheirresistancetodeformation．Thesefindings provide valuable technical guidance forthe application of modified calcareous sand in islandand ref construction projects.
Key words： calcareous sand; nano ZrO2 ；cement； stress deviation coefficient method；mechanical properties
0 引言
我國(guó)南海地區(qū)廣泛分布著鈣質(zhì)砂，它是一種富含碳酸鈣等難溶性碳酸鹽類(lèi)礦物，其形成過(guò)程復(fù)雜，主要是由生物體的碎屑與骨架所構(gòu)成。（剩余6278字）