摘要
设计强度等级C50的机制砂混凝土,研究石粉含量、母岩类型对机制砂混凝土抗压强度、坍落度及微观性能的影响。通过EDS能谱分析、XRD及SEM等微观分析方法,揭示石粉含量、母岩类型对机制砂混凝土性能影响机理。结果表明,母岩类型对机制砂混凝土抗压强度影响较小。随着石粉含量增加,机制砂混凝土抗压强度呈先增后降的趋势,其中石粉含量为机制砂总质量的9%时,石灰岩机制砂混凝土抗压强度最优,为69.6 MPa;当石粉含量为6%时,辉绿岩机制砂混凝土抗压强度最优,为66.0 MPa;当石粉含量为12%时,花岗岩机制砂混凝土抗压强度最优,为68.3 MPa。混凝土坍落度随石粉含量增加而减小。石粉含量增加,在一定程度上抑制了水泥水化,导致未水化的水泥、粉煤灰数量增加;当机制砂混凝土抗压强度最优时,C-S-H凝胶中的Ca/Si(CaO和SiO_(2)物质的量比)最低;石粉含量及母岩类型对机制砂混凝土水化产物影响并不显著。
The mechanism sand concrete with strength grade C50 was designed,and the influences of stone powder content and mother rock type on compressive strength,slump and microscopic performance of mechanism sand concrete were studied.Through EDS energy spectrum analysis,XRD and SEM,the influence mechanisms of stone powder content and mother rock type on performance of mechanism sand concrete were revealed.The results show that the mother rock type has less influence on compressive strength of mechanism sand concrete.With the increase of stone powder content,the compressive strength of mechanical sand concrete increases first and then decreases.When the stone powder content is 9%of the total mass of mechanism sand,the compressive strength of limestone mechanism sand concrete is the best,which is 69.6 MPa.When the stone powder content is 6%,the compressive strength of dolerite mechanism sand concrete is the best,which is 66.0 MPa.When the stone powder content is 12%,the compressive strength of granite mechanism sand concrete is the best,which is 68.3 MPa.The slump of concrete decreases with the increase of stone powder content.The increase of stone powder content suppresses cement hydration to some extent,and increases the amount of unhydration cement and fly ash.When the compressive strength of mechanism sand concrete is optimal,the Ca/Si ratio(CaO/SiO_(2)mole ratio)of C-S-H gel is the lowest.The stone powder content and mother rock type do not affect the hydration products of mechanism sand concrete.
作者
冯玉钏
贾小龙
惠迎新
韩方元
万磊
FENG Yuchuan;JIA Xiaolong;HUI Yingxin;HAN Fangyuan;WAN Lei(Ningxia Transportation Construction Co.,Ltd.,Yinchuan 750000,China;Ningxia Communications Transportation Technology Research Institute Co.,Ltd.,Yinchuan 750000,China;School of Civil Engineering and Water Conservancy Engineering,Ningxia University,Yinchuan 750000,China)
出处
《硅酸盐通报》
CAS
北大核心
2023年第8期2773-2780,共8页
Bulletin of the Chinese Ceramic Society
基金
宁夏交通科技项目(202100183)
宁夏回族自治区重点研发计划(2022BFE02006)。
关键词
机制砂
混凝土
母岩类型
石粉含量
抗压强度
微观结构
mechanism sand
concrete
mother rock type
stone powder content
compressive strength
microstructure
