新拌固化淤泥流动性测试标准试验研究
Experimental research on test standards for freshly mixed solidified sludge flowability
王硕 1黄英豪 2王文翀 1王淮 3彭广益3
作者信息
- 1. 南京水利科学研究院,江苏 南京 210029
- 2. 南京水利科学研究院,江苏 南京 210029;南京水利科学研究院 河湖库底泥处理与资源化利用研究中心,江苏 南京 210024
- 3. 苏州市港航事业发展中心,江苏 苏州 215007
- 折叠
摘要
流动性是评判新拌固化淤泥能否进行流动化施工的关键指标,一般采用流动度试验方法.研究流动度测试试验标准是推动新拌固化淤泥流动化施工的重要内容.采用目前主流的 3种流动度测量筒/截锥圆模,研究初始含水比、水泥掺量及水化反应时间对淤泥和新拌固化淤泥流动度的影响,讨论 3种流动度测量模具所反映的流动度规律异同及适用性.研究发现:(1)淤泥和新拌固化淤泥流动度具有最大/小值,随着初始含水比的增加呈现S形增长.(2)水泥掺量从 0变为 50 kg/m3 时对流动度影响最大,掺量继续增加流动度变化趋缓;水泥掺量固定时,水灰比和流动度呈现较明显的线性关系;3种流动度测量模具所得的拟合参数变化规律类似.(3)随着水泥水化反应的进行,新拌固化淤泥流动度下降,较高水泥掺量时流动度下降更快.(4)JHS.A 313和GB/T 2419流动度测量筒对初始含水比的变化关联度更强;ASTM D6103流动度测量筒因为其过长的高度,在实际操作中易造成试样倾斜,GB/T 2419测量筒则更容易混进空气,二者均对试验结果产生较大影响,因此推荐使用JHS.A 313流动度测量筒进行淤泥、新拌固化淤泥流动度的研究.
Abstract
Flowability is a key indicator for assessing the feasibility of flowable construction using freshly mixed solidified sludge,and it is typically evaluated through flowability tests.Research on flowability test standards is an important aspect of promoting flowable construction of freshly mixed solidified sludge.This study investigates the influence of initial water content,cement content,and hydration time on the flowability of sludge and freshly mixed solidified sludge using three mainstream flowability measurement cylinders/conical molds.The study also explores the similarities,differences,and applicability of the flowability patterns reflected by these three measurement molds.The findings of the study are as follows:(1)The flowability of sludge and freshly mixed solidified sludge exhibits maximum/minimum values,and it shows an S-shaped growth with an increase in initial water content.(2)The change in flowability is most significant when the cement content increases from 0 to 50 kg/m3,and the change becomes less pronounced as the cement content continues to increase.When the cement content is fixed,there is a clear linear relationship between water-cement ratio and flowability.The variation patterns of the fitting parameters obtained from the three flowability measurement molds are similar.(3)With the progress of cement hydration,the flowability of freshly mixed solidified sludge decreases,and the decrease is more rapid at higher cement content.(4)The JHS.A 313 and GB/T 2419 flowability measurement cylinders are more closely related to changes in initial water content.The ASTM D6103 flowability measurement cylinder,due to its excessive height,may cause sample tilting during practical operations,while the GB/T 2419 measurement cylinder is more prone to air entrainment.Both factors have a significant impact on the test results.Therefore,it is recommended to use the JHS.A 313 flowability measurement cylinder for the study of sludge and freshly mixed solidified sludge flowability.
关键词
固化淤泥/流动性测试/含水比/水泥掺量/水化反应/灰色理论Key words
solidified sludge/flowability testing/water content/cement content/hydration reaction/grey theory引用本文复制引用
基金项目
国家自然科学基金资助项目(51879166)
中央级公益性科研院所基本科研业务费项目(Y322002)
苏州市水运工程建设指挥部科研专项(CHSX-FW-CHSXYJ1-2023-18)
出版年
2024
NETL
NSTL
万方数据