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(黃淮學(xué)院建筑工程學(xué)院, 駐馬店 463000)

摘要: 為了研究再生骨料對自密實(shí)混凝土力學(xué)和長期性能的影響規(guī)律,以再生骨料的摻量與級配為變量,制備了4 種不同配合比的自密實(shí)混凝土拌合物,對其抗壓強(qiáng)度、劈裂抗拉強(qiáng)度和抗折強(qiáng)度進(jìn)行了測試,并對其孔徑分布和長期徐變行為機(jī)理進(jìn)行了分析. 結(jié)果表明:采用再生骨料制備自密實(shí)混凝土是可行的,適當(dāng)摻入再生骨料不會顯著影響自密實(shí)混凝土的和易性和間隙通過性. 在適當(dāng)?shù)脑偕橇先〈氏?自密實(shí)混凝土的力學(xué)性能可以等于甚至高于對照組;自密實(shí)混凝土的微觀結(jié)構(gòu)受再生骨料的摻量和級配的影響顯著,這造成了混凝土中微孔、介孔和大孔數(shù)量的顯著差異,進(jìn)而影響了其短期的新拌性能和長期的收縮應(yīng)力及徐變行為.

關(guān)鍵詞: 自密實(shí)混凝土; 再生骨料; 孔隙率; 長期性能

中圖分類號:TU528. 01 文獻(xiàn)標(biāo)志碼:A 文章編號:1002-848X(2023)12-0087-04

DOI:10. 19701 / j. jzjg. 20210151

Research on mechanical and long-term performance of recycled aggregate self-compacting concrete

YI Qinggang, JU Huahua, ZHANG Qizhi

(Institute of Architecture Engineering, Huanghuai University, Zhumadian 463000, China)

Abstract: In order to reveal the influence of recycled aggregates on the mechanical and long-term performance of selfcompacting concrete, four self-compacting concrete mixtures with different mix ratios were prepared with the content andgradation of recycled aggregates as variables, and their compressive strength, split tensile strength and flexural strengthwere tested, and its pore size distribution and long-term creep behavior mechanism were analyzed. The results show that itis feasible to prepare self-compacting concrete by using recycled aggregate, and appropriate addition of recycled aggregatewill not significantly affect the workability and clearance permeability of self-compacting concrete. The mechanicalproperties of self-compacting concrete can be equal to or even higher than those of the control group. The microstructure ofself-compacting concrete is significantly affected by the content and gradation of recycled aggregates. The significantdifference in the number of micropores, mesopores and macropores in concrete has been found to affect its short-term freshmixing performance and long-term shrinkage stress and creep behavior.

Keywords:self-compacting concrete; recycled aggregate; porosity; long-term performance

∗國家自然科學(xué)基金項(xiàng)目(51778105),綠色高性能混凝土材料及其應(yīng)用研究(ZGYGC1026).

第一作者:伊慶剛,碩士,工程師,主要從事混凝土動態(tài)力學(xué)特性及損傷機(jī)理研究,Email:zdjs_zqz@ 163. com.

[引用本文] 伊慶剛,琚花花,張啟志. 再生骨料自密實(shí)混凝土力學(xué)與長期性能研究[ J]. 建筑結(jié)構(gòu),2023,53(12):87-90,86. YI Qinggang,JU Huahua,ZHANG Qizhi. Research on mechanical and long-term performance of recycledaggregate self-compacting concrete[J]. Building Structure,2023,53(12):87-90,86.