«上一篇/Previous Article|本期目录/Table of Contents|下一篇/Next Article»

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

40卷

期数:

2023年02期

页码:

11-18

栏目:

建筑材料

出版日期:

2023-03-30

文章信息/Info

Title:

Thermal damage of seawater and sea sand mortar after elevated temperatures

文章编号:

1673-2049(2023)02-0011-08

作者:

谢青海^1,2,孙成建¹,肖建庄²,宗钟凌³

(1. 江苏海洋大学 土木与港海工程学院,江苏 连云港 222005; 2. 同济大学 建筑工程系,上海 200092; 3. 江苏海洋大学 江苏省海洋工程基础设施智能建造工程研究中心,江苏 连云港 222005)

Author(s):

XIE Qinghai^1,2, SUN Chengjian¹, XIAO Jianzhuang², ZONG Zhongling³

(1. School of Civil and Ocean Engineering, Jiangsu Ocean University, Lianyungang 222005, Jiangsu, China; 2. Department of Structural Engineering, Tongji University, Shanghai 200092, China; 3. Jiangsu Ocean Engineering Research Center for Intelligent Infrastructure Construction, Jiangsu Ocean University, Lianyungang 222005, Jiangsu, China)

关键词:

海水海砂拌合砂浆;  高温作用;  数字图像相关法;  热重分析;  强度退化;  微观结构损伤

Keywords:

seawater and sea sand mortar;  elevated temperature;  digital image correction method;  thermogravity analysis;  strength degradation;  microstructure damage

分类号:

TU528

DOI:

10.19815/j.jace.2021.11013

文献标志码:

A

摘要:

采用天然海水海砂配制了水灰比分别为0.40和0.47的砂浆,研究了其在不同高温作用后的力学性能退化及微观结构损伤。通过三点弯曲及单轴压缩试验,测得了海水海砂拌合砂浆(SSM)抗折与抗压强度随温度变化情况。结合数字图像相关法(DIC)实时捕捉了三点弯曲荷载作用下SSM变形发展过程。通过热重分析测得了海水拌合水泥净浆随温度失重情况; 通过扫描电子显微镜(SEM)观察并分析了高温后净浆的微观结构损伤情况。结果表明:SSM高温后抗折与抗压强度随温度升高出现先增长后降低的趋势,抗折强度相比抗压强度退化更严重; 建立的抗折与抗压强度退化公式与试验吻合较好; DIC结果显示在同等应力水平作用下,温度越高,SSM跨中应变发展越充分,峰值应力时跨中变形越大; 热重分析结果显示,随温度升高,水灰比越大的净浆质量损失越多; 扫描电镜结果显示,净浆内部结构随温度升高越来越疏松。

Abstract:

Natural seawater and sea sand were adopted to mix mortars with water-cement ratios of 0.40 and 0.47, and the mechanical behavior degradation and microstructure damage were investigated after elevated temperatures. Three-point bending and axially compression tests were conducted to obtain the changes of of flexural and compressive strength of seawater and sea sand mortar(SSM)after elevated temperature. Combined with digital image correlation(DIC)method, the deformation development process of SSM under three-point bending load was captured in real time. Thermogravity analysis was performed to measure the mass loss of seawater mixed cement paste under elevated temperatures. The microstructure damage of the paste after high temperature was observed and analyzed by scanning electron microscope(SEM). The results show that after high temperature, the flexural and compressive strength of SSM increase first and then decrease with the increase of temperature, and the degradation of flexural strength is larger than that of compressive strength. The established degradation formula of flexural and compressive strength is in good agreement with the test. DIC results show that under the same stress level, the higher the temperature is, the more fully the SSM mid-span strain develops, and the greater the mid-span deformation at peak stress. The thermogravity analysis results show that with the increase of temperature, the greater the water-cement ratio, the more the mass loss of the slurry. SEM results indicate the microstructure of paste becomes notably looser after higher temperature.

参考文献/References:

[1] XIAO J Z,QIANG C,NANNI A,et al.Use of sea-sand and seawater in concrete construction:current status and future opportunities[J].Construction and Building Materials,2017,155:1101-1111.
[2]肖建庄,张 鹏,张青天,等.海水海砂再生混凝土的基本力学性能[J].建筑科学与工程学报,2018,35(2):16-22.
XIAO Jianzhuang,ZHANG Peng,ZHANG Qingtian,et al.Basic mechanical properties of seawater sea-sand recycled concrete[J].Journal of Architecture and Civil Engineering,2018,35(2):16-22.
[3]滕锦光.新材料组合结构[J].土木工程学报,2018,51(12):1-11.
TENG Jinguang.New-material hybrid structures[J].China Civil Engineering Journal,2018,51(12):1-11.
[4]ZHAO Y F,HU X,SHI C J,et al.A review on seawater sea-sand concrete:mixture proportion,hydration,microstructure and properties[J].Construction and Building Materials,2021,295:123602.
[5]ETXEBERRIA M,GONZALEZ-COROMINAS A,PARDO P,et al.Influence of seawater and blast furnace cement employment on recycled aggregate concretes' properties[J].Construction and Building Materials,2016,115:496-505.
[6]LI H,FARZADNIA N,SHI C,et al.The role of seawater in interaction of slag and silica fume with cement in low water-to-binder ratio pastes at the early age of hydration[J].Construction and Building Materials,2018,185:508-518.
[7]KHATIBMASJEDI M,RAMANATHAN S,SURANENI P,et al.Compressive strength development of seawater-mixed concrete subject to different curing regimes[J].ACI Materials Journal,2020,117(5):1-10.
[8]ZHANG K J,XIAO J Z,ZHANG Q T.Experimental study on stress-strain curves of seawater sea-sand concrete under uniaxial compression with different strain rates[J].Advances in Structural Engineering,2021,24(6):1124-1137.
[9]XIAO J Z,ZHANG Q T,ZHANG P,et al.Mechanical behavior of concrete using seawater and sea-sand with recycled coarse aggregates[J].Structural Concrete,2019,20(5):1631-1643.
[10]ZHANG Q T,XIAO J Z,LIAO Q X,et al.Structural behavior of seawater sea-sand concrete shear wall reinforced with GFRP bars[J].Engineering Structures,2019,189:458-470.
[11]ZHANG Q T,XIAO J Z,ZHANG P,et al.Mechanical behaviour of seawater sea-sand recycled coarse aggregate concrete columns under axial compressive loading[J].Construction and Building Materials,2019,229:117050.
[12]DONG Z Q,SUN Y,WU G,et al.Flexural behavior of seawater sea-sand concrete beams reinforced with BFRP bars/grids and BFRP-wrapped steel tubes[J].Composite Structures,2021,268:113956.
[13]AHMADI M T,AGHAKOUCHAK A A,MIRGHADERI R,et al.Collapse of the 16-story plasco building in Tehran due to fire[J].Fire Technology,2020,56(2):769-799.
[14]肖建庄.高性能混凝土结构抗火设计原理[M].北京:科学出版社,2015.
XIAO Jianzhuang.Fire safety design principle of high-performance concrete structures[M].Beijing:Science Press,2015.
[15]LI Y L,ZHAO X L,RAMAN R,et al.Thermal and mechanical properties of alkali-activated slag paste,mortar and concrete utilising seawater and sea sand[J].Construction and Building Materials,2018,159:704-724.
[16]QU F L,LI W G,TANG Z,et al.Property degradation of seawater sea sand cementitious mortar with GGBFS and glass fiber subjected to elevated temperatures[J].Journal of Materials Research and Technology,2021,13:366-384.
[17]张 凯,李田雨,刘小艳,等.海水海砂高性能混凝土耐高温性能研究[J].粉煤灰综合利用,2020,34(4):64-70.
ZHANG Kai,LI Tianyu,LIU Xiaoyan,et al.Research on high temperature resistance of seawater sand high performance concrete[J].Fly Ash Comprehensive Utilization,2020,34(4):64-70.
[18]曹园章,郭丽萍,薛晓丽.NaCl和Na₂SO₄对水泥水化机理的影响[J].东南大学学报(自然科学版),2019,49(4):712-719.
CAO Yuanzhang,GUO Liping,XUE Xiaoli.Effects of sodium chloride and sodium sulfate on hydration process[J].Journal of Southeast University(Natural Science Edition),2019,49(4):712-719.
[19]黄一杰,何绪家,颜雪雪,等.海砂再生混凝土受压力学性能试验研究与分析[J].混凝土,2019(4):19-23.
HUANG Yijie,HE Xujia,YAN Xuexue,et al.Experimental study and analysis on sea sand recycled concrete under axial compression[J].Concrete,2019(4):19-23.
[20]LIU Y H,ZENG L,XIANG S,et al.Compressive performance evaluation of concrete confined by stirrups at elevated temperature using DIC technology[J].Construction and Building Materials,2020,260:119883.
[21]时金娜,赵燕茹,郝 松,等.基于DIC技术的高温后混凝土变形性能[J].建筑材料学报,2019,22(4):584-591.
SHI Jinna,ZHAO Yanru,HAO Song,et al.Deformation behavior of concrete under uniaxial compression after high temperature by DIC technology[J].Journal of Building Materials,2019,22(4):584-591.
[22]赵燕茹,刘道宽,王 磊.基于DIC玄武岩纤维混凝土高温后抗折损伤分析[J].混凝土,2021(2):42-46,62.
ZHAO Yanru,LIU Daokuan,WANG Lei.Flexural damage analysis of basalt fiber reinforced concrete after high temperature based on DIC method[J].Concrete,2021(2):42-46,62.
[23]许小燕,袁广林,成林燕,等.高温对高强度水泥砂浆强度影响的试验研究[J].山东科技大学学报(自然科学版),2009,28(5):35-38,48.
XU Xiaoyan,YUAN Guanglin,CHENG Linyan,et al.Experimental study on the effect of high temperature on the strength of high-strength cement mortar[J].Journal of Shandong University of Science and Technology(Natural Science),2009,28(5):35-38,48.
[24]李清海,姚 燕,孙 蓓,等.高温对水泥砂浆强度的影响及机理分析[J].建筑材料学报,2008,11(6):699-703.
LI Qinghai,YAO Yan,SUN Bei,et al.Mechanism of effect of elevated temperature on compressive strength of cement mortar[J].Journal of Building Materials,2008,11(6):699-703.

相似文献/References:

备注/Memo

备注/Memo:

收稿日期:2021-11-02
基金项目:中国博士后科学基金项目(2020M681390); 江苏省自然科学基金项目(BK20210925); 江苏省高等学校自然科学研究面上项目(20KJB560020)
作者简介:谢青海(1990-),男,工学博士,讲师,E-mail:qinghai2019@jou.edu.cn。

常用功能

更新日期/Last Update: 2023-03-20