The durability of the cement was mainly studied. Under 1.0 MPa of hydraulic pressure for 8 hours, water could penetrate completely through the sample made by portland cement, but could not penetrate through that by al...The durability of the cement was mainly studied. Under 1.0 MPa of hydraulic pressure for 8 hours, water could penetrate completely through the sample made by portland cement, but could not penetrate through that by alite-barium sulphoaluminate cement. Under the condition of freezing and thawing cycle, the loss ratio of compressive strength of the cement was only about 17.3% at curing 28 d ages, but the loss of portland cement was as high as 29.5%. Alite-calcium barium sulphoaluminate cement also has an excellent resistance to sulfate attack. The coefficients of resistance to sulfate attack of the cement exceeded 1.0. Meanwhile, the composition and microstructure of the hardened paste of alite-calcium barium sulphoaluminate cement were analyzed by XRD and SEM.展开更多
Formation and coexistence of tricalciurn silicate （C3S） and calcium sulphoaluminate （ C4 A3S^- ） minerals in Portland cement clinker containing calcium sulphoaluminate were investigated. Thef-CaO content, mineral ...Formation and coexistence of tricalciurn silicate （C3S） and calcium sulphoaluminate （ C4 A3S^- ） minerals in Portland cement clinker containing calcium sulphoaluminate were investigated. Thef-CaO content, mineral composite and formation of mineral in the clinker were analyzed respectively by chemical analysis, differential scanning calorimetry（DSC） and X-ray diffraction. The results show that, adding a suitable amount of BaO can improve the burnability of raw meal and promote the f-CaO absorption. Tricalcium silicate and calcium sulphoaluminate minerals can form and coexist in clinkers at 1 234-1 317 ℃ by the addition of BaO to the raw meal. A suitable amount of BaO expanded the coexistence temperature of two minerals by 58 ℃.展开更多
基金Funded by the National Natural Science Foundation of China (No.50672033)the "973"National Key Fundamental Research Plan ofChina (No.2009CB623101-1)
文摘The durability of the cement was mainly studied. Under 1.0 MPa of hydraulic pressure for 8 hours, water could penetrate completely through the sample made by portland cement, but could not penetrate through that by alite-barium sulphoaluminate cement. Under the condition of freezing and thawing cycle, the loss ratio of compressive strength of the cement was only about 17.3% at curing 28 d ages, but the loss of portland cement was as high as 29.5%. Alite-calcium barium sulphoaluminate cement also has an excellent resistance to sulfate attack. The coefficients of resistance to sulfate attack of the cement exceeded 1.0. Meanwhile, the composition and microstructure of the hardened paste of alite-calcium barium sulphoaluminate cement were analyzed by XRD and SEM.
基金Funded by the National Basic Research Program of China (No.2009CB623100)National Eleven Five-Year Scientific and Technical Support Plans (No. 2006BAF02A24)+2 种基金the Natural Science Fund for Colleges and Universities in Jiangsu Province(No. 08KJB430006)the Open Fund for the Key Laboratory of Inorganical and Composite Materials in Jiangsu Province(No.wjjqfhxc1200801)the Innovation Fund of Doctoral Dissertation of Nanjing University of Technology (No. BSCX200705)
文摘Formation and coexistence of tricalciurn silicate （C3S） and calcium sulphoaluminate （ C4 A3S^- ） minerals in Portland cement clinker containing calcium sulphoaluminate were investigated. Thef-CaO content, mineral composite and formation of mineral in the clinker were analyzed respectively by chemical analysis, differential scanning calorimetry（DSC） and X-ray diffraction. The results show that, adding a suitable amount of BaO can improve the burnability of raw meal and promote the f-CaO absorption. Tricalcium silicate and calcium sulphoaluminate minerals can form and coexist in clinkers at 1 234-1 317 ℃ by the addition of BaO to the raw meal. A suitable amount of BaO expanded the coexistence temperature of two minerals by 58 ℃.
