Analysis of Active Mechanism of Chemical Activated Strontium Slag
Advances in Materials
Volume 8, Issue 4, December 2019, Pages: 170-175
Received: Oct. 16, 2019;
Accepted: Nov. 6, 2019;
Published: Nov. 21, 2019
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Hongzhou Zhu, Opening Funding Supported by the Key Laboratory of Road Structure & Material Ministry of Transport, Beijing, People's Republic of China; National and Local Joint Engineering Laboratory of Traffic Civil Engineering Materials, Chongqing Jiaotong University, Chongqing, People's Republic of China; Department of Civil Engineering, Chongqing Jiaotong University, Chongqing, People's Republic of China
Li Ou, Department of Civil Engineering, Chongqing Jiaotong University, Chongqing, People's Republic of China
Daqian Wang, Department of Civil Engineering, Chongqing Jiaotong University, Chongqing, People's Republic of China
Lanxin Hu, Department of Civil Engineering, Chongqing Jiaotong University, Chongqing, People's Republic of China
Erhu Yan, Opening Funding Supported by the Key Laboratory of Road Structure & Material Ministry of Transport, Beijing, People's Republic of China
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In order to improve the activity of strontium slag, the mixed cementitious material of strontium slag cement was prepared by adding 30% (mass fraction) of pulverized strontium slag into cement. Chemical activators such as Na2SiO4, NaOH, CaCl2, NaCl, Ca(OH)2, Na2SO4 were added to the cementitious material. The flexural and compressive strength values of 3d, 7d, 28d were obtained by mortar strength test, and were used as the base with standard samples. The mechanism of activator improving the activity of strontium slag is analyzed. CaCl2 and NaCl are cement early strength agents. So the substitution of strontium slag with silica powder is compared. The strength of strontium slag is judged by principle analysis. The results show that NaOH and Ca(OH)2 are beneficial to the activation of SiO2 and Al2O3, but the amount of ettringite is large and the strength is reduced, so there is a certain active excitation for strontium slag, but the effect is not very good; the addition of Na2SiO4 causes damage to volume stability and it is the worst of all activators. the compressive strength increases rapidly in 3d and 7d after adding NaCl, so it is mainly to stimulate the early strength of cement; The 28d compressive strength of strontium slag cement containing CaCl2 is higher than that of strontium slag cement containing other chemical activators, which can reach 91% of the compressive strength of cement mortar. It is preliminarily judged that CaCl2 has an exciting effect on strontium slag and the exciting effect is obvious.
Pulverized Strontium Slag, Chemical Activation, Activity, Mechanism
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Analysis of Active Mechanism of Chemical Activated Strontium Slag, Advances in Materials.
Vol. 8, No. 4,
2019, pp. 170-175.
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