In this paper,the strength and petrographic structure of clinker by low-temperature burning are studied.The results show that both the calcining temperature of Ca-CO3 and sintering temperature clinker decreases by 150...In this paper,the strength and petrographic structure of clinker by low-temperature burning are studied.The results show that both the calcining temperature of Ca-CO3 and sintering temperature clinker decreases by 150 degrees C compared with those in traditional rotary kiln,the rate of f-CaO in the clinker sintered at 1300 degrees C is 0.29%similar to 2.81%,the strength of the clinker is 62.5MPa with maximum 69.4MPa at a specific area of 2900 similar to 3400cm(2)/g.The results also show that the types of petrographic structure of the clinker can be classified as:homogeneous structure,inlaid or edged structure,stain-melting structure and porous structure.The clinker sintered at 1300+/-15 degrees C temperature and with enough retention period is mainly in homogeneous structure.展开更多
为了明确多因素耦合作用下低钙高强水泥混凝土的性能退化机理,本文通过设置不同侵蚀因素(冻融-溶蚀、冻融-Cl^(-)侵蚀、溶蚀-Cl^(-)侵蚀、冻融-溶蚀-Cl^(-)侵蚀),结合外观变化、质量变化、超声波速率、Cl^(-)含量、物相组成测试等,研究...为了明确多因素耦合作用下低钙高强水泥混凝土的性能退化机理,本文通过设置不同侵蚀因素(冻融-溶蚀、冻融-Cl^(-)侵蚀、溶蚀-Cl^(-)侵蚀、冻融-溶蚀-Cl^(-)侵蚀),结合外观变化、质量变化、超声波速率、Cl^(-)含量、物相组成测试等,研究了低钙原料高强熟料水泥(Low-calcium raw material and high-strength clinker cement,LCHS)混凝土的损伤演化规律。结果表明:在冻融-溶蚀-Cl^(-)侵蚀耦合作用下,LCHS混凝土历经早期质量提升、中期Ca^(2+)溶蚀与盐结晶的动态平衡以及后期损害快速发展的过程,溶蚀-Cl^(-)侵蚀作用在早期和中期会降低LCHS混凝土的损伤;冻融-Cl^(-)侵蚀和冻融-溶蚀对LCHS混凝土的损伤基本高于冻融-溶蚀-Cl^(-)侵蚀;LCHS混凝土的耐久性能优于普通硅酸盐水泥混凝土。研究结果可以为寒冷地区、地下水或除冰盐环境下低钙高强水泥混凝土结构的设计、耐久性能评估及寿命预测提供参考。展开更多
The effect of rare-earth and HX addition agent on the burn-ability of silicate cement dinker was investigated by orthogonal experiment. The result shows, compared with blank sample, f CaO of the .samples added with ra...The effect of rare-earth and HX addition agent on the burn-ability of silicate cement dinker was investigated by orthogonal experiment. The result shows, compared with blank sample, f CaO of the .samples added with rare-earth and HX agent drops by 84.95% , its 3 d and 28d compressive strength enhances by 24.40% and 16.90% , respectively. It was discovered by means of X-ray diffrnction and high temperature microscope analysis that sintering temperature of the sample added with rare-earth and HX addition agent is about 1320℃. At the same time, the tmrning temperature of triealeium silicate desends and its crystal growth forming- rate increases. Tricalcium silicate content in burning clinker is higher and its crystal is larger.展开更多
文摘In this paper,the strength and petrographic structure of clinker by low-temperature burning are studied.The results show that both the calcining temperature of Ca-CO3 and sintering temperature clinker decreases by 150 degrees C compared with those in traditional rotary kiln,the rate of f-CaO in the clinker sintered at 1300 degrees C is 0.29%similar to 2.81%,the strength of the clinker is 62.5MPa with maximum 69.4MPa at a specific area of 2900 similar to 3400cm(2)/g.The results also show that the types of petrographic structure of the clinker can be classified as:homogeneous structure,inlaid or edged structure,stain-melting structure and porous structure.The clinker sintered at 1300+/-15 degrees C temperature and with enough retention period is mainly in homogeneous structure.
文摘为了明确多因素耦合作用下低钙高强水泥混凝土的性能退化机理,本文通过设置不同侵蚀因素(冻融-溶蚀、冻融-Cl^(-)侵蚀、溶蚀-Cl^(-)侵蚀、冻融-溶蚀-Cl^(-)侵蚀),结合外观变化、质量变化、超声波速率、Cl^(-)含量、物相组成测试等,研究了低钙原料高强熟料水泥(Low-calcium raw material and high-strength clinker cement,LCHS)混凝土的损伤演化规律。结果表明:在冻融-溶蚀-Cl^(-)侵蚀耦合作用下,LCHS混凝土历经早期质量提升、中期Ca^(2+)溶蚀与盐结晶的动态平衡以及后期损害快速发展的过程,溶蚀-Cl^(-)侵蚀作用在早期和中期会降低LCHS混凝土的损伤;冻融-Cl^(-)侵蚀和冻融-溶蚀对LCHS混凝土的损伤基本高于冻融-溶蚀-Cl^(-)侵蚀;LCHS混凝土的耐久性能优于普通硅酸盐水泥混凝土。研究结果可以为寒冷地区、地下水或除冰盐环境下低钙高强水泥混凝土结构的设计、耐久性能评估及寿命预测提供参考。
文摘The effect of rare-earth and HX addition agent on the burn-ability of silicate cement dinker was investigated by orthogonal experiment. The result shows, compared with blank sample, f CaO of the .samples added with rare-earth and HX agent drops by 84.95% , its 3 d and 28d compressive strength enhances by 24.40% and 16.90% , respectively. It was discovered by means of X-ray diffrnction and high temperature microscope analysis that sintering temperature of the sample added with rare-earth and HX addition agent is about 1320℃. At the same time, the tmrning temperature of triealeium silicate desends and its crystal growth forming- rate increases. Tricalcium silicate content in burning clinker is higher and its crystal is larger.
