摘要
为了探究二次铝灰烧结渣料的建材化利用途径,开展了不同掺量烧结渣料对C50、C60及C70混凝土力学性能和收缩性能的影响及机理研究。研究结果表明,烧结渣料掺量为15%(占总细骨料质量)时C50和C60混凝土的抗压强度均略高于未掺加烧结渣料基准试件,而对C70混凝土而言,不同烧结渣料掺量高强混凝土试件抗压强度均低于未掺加烧结渣料的基准试件,且烧结渣料掺量在10%~15%时,抗压强度的降低幅度最低。低掺量烧结渣料对高强混凝土峰值应变、极限应变、弹性模量及泊松比的影响不明显,但高掺量烧结渣料影响显著,且对更高强度等级混凝土影响最大;烧结渣料掺量为15%时高强混凝土的总收缩率和自收缩率最低,其中C50、C60及C70混凝土总收缩率相较未掺加烧结渣料的基准试件分别下降29.05%、22.17%和27.88%,自收缩率分别下降15.24%、26.52%和30.56%。因此,烧结渣料掺量为15%时,对高强混凝土的内养护作用和自身强度低的负面作用效果相当,从而使高强混凝土获得适宜的抗压强度和最低收缩率。
In order to explore the way of building materials utilization of secondary aluminum ash sintered slag,the influence and mechanism of different content of sintered slag on the mechanical and shrinkage properties of C50,C60 and C70 concrete were studied.The results show that the compressive strength of C50 and C60 concrete is slightly higher than that of unadded sintered slag reference specimen when the content of sintered slag is 15%(account for total fine aggregate mass),while for C70 concrete,the compressive strength of high-strength concrete specimens with different sintered slag content is lower than that of unadded sintered slag reference specimen.When the sintered slag content is in the range of 10%~15%,the reduction of compressive strength is the lowest.The effect of low content sintered slag on peak strain,ultimate strain,elastic modulus and Poisson ratio of high-strength concrete is not obvious,but the effect of high content sintered slag is significant,and the effect is the greatest on higher strength grade concrete.When the sintered slag content is 15%,the total shrinkage rate and self-shrinkage rate of high-strength concrete are the lowest,among which the total shrinkage of C50,C60 and C70 concrete decreases by 29.05%,22.17% and 27.88%,and the self-shrinkage rate decreases by 15.24%,26.52% and 30.56%,respectively,compared with the reference group without sintered slag.Therefore,when the content of sintered slag is 15%,the internal curing effect of high-strength concrete is equivalent to the negative effect of low self-strength,so that high-strength concrete can obtain the appropriate compressive strength and the lowest shrinkage rate.
作者
纪璐鑫
马红瑞
马哲洋
王胜
崔嘉铭
巴明芳
JI Luxin;MA Hongrui;MA Zheyang;WANG Sheng;CUI Jiaming;BA Mingfang(School of Civil Engineering and Geographical Environment,Ningbo University,Ningbo 315211,China)
出处
《硅酸盐通报》
北大核心
2025年第1期212-222,共11页
Bulletin of the Chinese Ceramic Society
基金
宁波市“科技创新2025”重大专项(2020Z100,2022Z031)
浙江省公益技术项目(LGF22E080020)。
关键词
高强混凝土
收缩变形
力学性能
应力-应变曲线
二次铝灰
烧结渣料
high-strength concrete
shrinkage deformation
mechanical property
stress-strain curve
secondary aluminum ash
sintered slag
