不同鋇摻量硫鋁酸鋇鈣礦物結構及其水化

尚 小 朋， 常 鈞， 房 延 鳳， 張 洋 洋

( 大連理工大學 土木工程學院, 遼寧 大連 116024 )

不同鋇摻量硫鋁酸鋇鈣礦物結構及其水化

尚 小 朋， 常 鈞*， 房 延 鳳， 張 洋 洋

( 大連理工大學 土木工程學院, 遼寧 大連 116024 )

硫鋁酸鋇鈣礦物；鋇摻量；Ba2+利用率；晶面間距；水化

0 引 言

1 實 驗

1.1 礦物燒成

n(CaCO3)∶n(BaCO3)∶n(Al2O3)∶n(CaSO4)=

(3-xmin)∶xmin∶3∶1；xmix≤3 mol

(1)

n(BaCO3)∶n(Al2O3)∶n(CaSO4)∶n(BaSO4)=

3∶3∶(4-xmin)∶(xmin-3)；xmix>3 mol

(2)

1.2 礦物組成分析

使用德國布魯克公司D8 advance達芬奇X射線衍射儀進行測試，銅靶，波長為0.150 6 nm，發散狹縫0.6 mm，探測器為Lynxeye線性探測器，開口為2.94°．光管工作狀態為40 kV，40 mA，測試角度為5°～80°，掃描步長為0.02°，測量時間為1 s．采用Rietveld全譜擬合方法進行無標樣定量分析及Ba2+占位信息分析，分析中所用ICSD號如表1所示．擬合過程中光源參數及設備參數跟衍射儀對應，修正內容包括零點誤差、背底等．在Rietveld全譜擬合過程中，用Rwp(儀器花樣因子)評價擬合結果(式(3))，Rwp越小，擬合結果越準確，一般認為Rwp<15，結果即為可靠[8]．

(3)

式中：yi,obs為衍射圖譜上2θi點處的實測強度；yi,cal為衍射圖譜上2θi點處的計算強度；wi是加權因子．

表1 Rietveld全譜擬合過程中所用礦物的ICSD號

1.3 水化過程

2 結果與討論

2.1 鋇摻量對礦物組成的影響

圖1 熟料XRD譜圖

(a) xmix=0.2 mol

(b)xmix=3.8 mol

圖2 熟料的Rietveld全譜擬合結果

Fig.2 Rietveld whole pattern fitting results for clinkers

圖3 不同鋇摻量的熟料組成

2.2 Ba2+利用率

利用XRD Rietveld全譜擬合和理論計算的方法對Ba2+利用率進行計算．Ba2+的占位比由下式計算：

P=Pcwc+Powo

(4)

Ba2+利用率按下式計算：

(5)

圖4 實際鋇含量和Ba2+利用率

圖的晶面間距

2.4 抗壓強度

不同鋇摻量熟料的抗壓強度如圖6所示．隨著鋇摻量的增加，抗壓強度不斷提高，鋇摻量達到1.4 mol 時抗壓強度達到最高值，3、7 d的抗壓強度分別為50.9、54.8 MPa．之后隨著鋇摻量的增加，抗壓強度逐漸降低，當鋇摻量達到2.6 mol時，試塊開始出現裂縫．開裂試塊的形貌如圖7所示．

圖6 不同鋇摻量熟料的抗壓強度

圖7 開裂試塊

3 結 語

隨著鋇摻量增加抗壓強度先增大后減小，達到1.4 mol 時抗壓強度達到最高值，3、7 d的抗壓強度分別為50.9、54.8 MPa．之后隨著鋇摻量的增加，膨脹增大，當鋇摻量達到2.6 mol時試塊開始出現裂縫．

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Mineral structure and hydration of calcium barium sulphoaluminate with different barium mixing amounts

SHANG Xiaopeng, CHANG Jun*, FANG Yanfeng, ZHANG Yangyang

( School of Civil Engineering, Dalian University of Technology, Dalian 116024, China )

calcium barium sulphoaluminate mineral; barium mixing amount; Ba2+utilization percentage; interplanar crystal spacing; hydration

2016-05-31；

2016-11-08．

國家自然科學基金資助項目(51472041).

尚小朋(1982-)，男，博士生，E-mail:3942765@qq.com；常 鈞*(1970-)，男，教授，博士生導師，E-mail:mlchang@dlut.edu.cn.

1000-8608(2017)02-0142-06

TU528

A

10.7511/dllgxb201702005