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Effect of Doping SrO and SrSO4 on Synthesis and Performance of Alite-rich Cement

Author: LiGuiQiang
Tutor: LuLingChao
School: Jinan University
Course: Materials Science
Keywords: Doping High alite Strontium oxide Strontium sulfate Sulfur strontium aluminate calcium Calcining system
CLC: TQ172.1
Type: Master's thesis
Year: 2011
Downloads: 38
Quote: 1
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Abstract


China's cement output reached 18.7 million tons in 2010, resulting in huge energy and resource consumption, increasingly serious environmental pollution. Therefore, how to achieve the sustainable development of the cement industry is the main task facing the current. The high-quality construction the engineering requirements Cement and Concrete Construction and better, stronger and has good durability and ask to take advantage of more industrial waste in cement production and use. The key to the production of high-performance cement is the preparation of high cementing cement clinker, cement clinker the alite content is prepared high cementing clinker is one effective way; In addition, the introduction of non-silicon cement clinker high cementing mineral salts formed of high cementing clinker mineral phase system is also preparing high cementing clinker. In this paper, in high alite Cement clinker in doped SrO and SrSO 4 , the alite cement clinker preparation, structure and performance. In high alite Cement clinker in doped SrO SrSO 4 to form a small amount of sulfur strontium aluminate calcium minerals with rapid hardening early strength performance, preparation of high sulfur strontium aluminate calcium modified alite cement clinker. Orthogonal experiment method to determine the clinker calcination appropriate system and composition. In through the research doping SrO and SrSO 4 , C 3 S change in crystal structure and performance, the improve C 3 S hydration activity effective method. Means of XRD, SEM-EDS, IR, heat of hydration and facies analysis test clinker and mineral composition, structure and performance analysis, preliminary sets the doping SrO and SrSO , 4 conditions to improve the mechanism of the cement properties. The main conclusions are as follows: 1450 ° C calcination conditions, in the composition range of the present experiment, the high alite cement clinker suitable rate is: KH = 0.92, SM = 2.5, IM = 1.5, the C 3 S calculated content of 65.1%; prepared in the conditions of high alite cement 1d, 3d and 28d compressive strength of 23.4MPa, 53.7MPa and 129.1MPa show good mechanical properties. KH value is too high, the alite content is not significantly increased, but could easily lead to the cement clinker calcination difficulty. To doping SrO and SrSO , 4 can reduce the clinker free lime content, and promote the formation of alite minerals, is conducive to the improvement of the strength of cement. Alite cement clinker doped SrO best preparation conditions: calcination temperature of 1450 ° C, the holding time of 60 min, the the SrO appropriate content of 1.5% (mass fraction) significantly improve the mechanical properties of cement early , 3d strength can be increased to 15.5%. Appropriate content doping SrSO 4 high alite cement clinker preparation conditions: calcination temperature of 1450 ° C, holding time of 60 min, SrSO 4 0.5%, significantly improved mechanical properties of cement late 28 d strength can be increased by 9.9%. The introduction of sulfur strontium aluminate calcium minerals can reduce the high alite cement clinker system firing temperature of approximately 100 ° C, and to reduce clinker of free calcium oxide content, promote the formation of alite mineral. Under our experimental conditions, the calcium sulfur strontium aluminate modified high alite cement clinker preparation conditions: calcination temperature of 1350 ° C, holding time of 60 min, the introduction of sulfur strontium aluminate calcium 2%. The prepared cement 1d, 3d and 28d compressive strength reached 28.5 MPa, 66.7MPa and 128.6MPa, good mechanical properties. Clinker alite the degree of development of the minerals calcium and sulfur strontium aluminate are not complete enough, mineral size is small; sulfur strontium aluminate calcium mineral size of about 0.1, present in the silicate minerals boundaries and voids. At the same time, doping SrO and SrSO , 4 C 3 S crystal structure and performance. The results show that: the free calcium oxide content in the sample gradually increased with the increase in the dosage of SrO, SrO dosage is less than 0.075mol free calcium oxide content is low and lower than the pure C 3 S. When SrO dosage less than 0.025mol, the diffraction peaks of tricalcium silicate solid solution changes are triclinic; when SrO dosage greater than 0.025mol, tricalcium silicate solid solution for the monoclinic system. With the increase of SrO dosage, the solid solution of tricalcium silicate absorption bands at 815cm-1 gradually disappears from the sharp increase in the degree of substitution, its symmetry improved. Accelerated phase advance doped SrO tricalcium silicate hydration rate increases, so that the solid solution of tricalcium silicate greater hydration activity. SrSO 4 less dosage can reduce the free calcium oxide content in the sample, to promote the formation of C 3 S; when SrSO 4 the dosage is gradually increased, the free calcium oxide content in the sample is gradually increased. The tricalcium silicate crystal doped with 1.5% SrSO 4 is R-type. Doping SrSO 4 after C 3 S 815cm-1 absorption bands from sharp gradually disappear.

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CLC: > Industrial Technology > Chemical Industry > Silicate > Cement Industry > Basic theory
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