登录
注册
E-alert
登录
注册
E-alert
MIX PROPORTION OPTIMIZATION OF HIGH FLUIDITY CONCRETE AND ITS MICROSTRUCTURE CHARACTERIZATION
-
摘要: 针对非洲建设工程的实际条件，对比了两种不同配合比的大流动性混凝土的性能和微结构。与现在使用的掺有硅灰的矿渣硅酸盐水泥混凝土相比，优化后的普通硅酸盐水泥混凝土适当降低了水胶比，增加了浆骨比，调整了外加剂的种类和掺量。测定了新拌混凝土的扩展度和硬化混凝土抗压强度，研究了浆体的早期水化放热特性，并通过扫描电镜观察和压汞试验分析了硬化浆体的微观形貌和孔隙特征。结果表明：普通硅酸盐水泥混凝土拌和物的流动性能与保坍性能比掺有硅灰的矿渣硅酸盐水泥混凝土好，各个龄期的抗压强度高。普通硅酸盐水泥浆体早期水化程度比掺有硅灰的矿渣硅酸盐水泥浆体高，浆体结构更为致密。Abstract: According to the actual conditions of construction projects in Africa, the properties and microstructure of two kinds of high fluidity concrete were compared. Compared with Portland slag cement concrete mixed with silica fumes used now, the optimized ordinary Portland cement concrete had been appropriately reduced the water-binder ratio, increased the paste-aggregate ratio, and adjusted the type and amounts of admixture. Slump flow of fresh concrete and compressive strength of hardened concrete were measured, early hydration exothermic characteristics of paste were studied, and microstructure and pore characteristics of harden paste were analyzed by SEM and MIP. The results showed that the performances of flow, slump retention, and compressive strength at each age of ordinary Portland cement concrete were better than that of slag Portland cement concrete mixed with silica fumes. The early hydration degree of ordinary Portland cement paste was higher than that of slag Portland cement paste mixed with silica fume, and the pore structure of ordinary Portland cement paste was denser.
-
HASSAN K E, CABRERA J G, MALIEHE R S. The Effect of Mineral Admixtures on the Properties of High-Performance Concrete[J]. Cement and Concrete Composites, 2000, 22(4):267-271. 孙建伟, 王强, 陈忠辉,等.28 d抗压强度条件下粉煤灰和矿渣对C50混凝土后期性能的影响[J]. 硅酸盐通报, 2016, 35(8):2524-2529. JIAO D, SHI C, YUAN Q, et al. Effect of Constituents on Rheological Properties of Fresh Concrete:A Review[J]. Cement and Concrete Composites, 2017, 83:146-159. VIVEK S S, DHINAKARAN G. Durability Characteristics of Binary Blend High Strength SCC[J]. Construction and Building Materials, 2017, 146:1-8. 刘进, 何伟, 王栋民. 蒸养条件下水泥-磷渣复合胶凝材料的水化产物的长龄期特征[J]. 电子显微学报, 2017, 36(6):571-576. 庄筱. 偏高岭土在混凝土中的应用研究[D]. 南京:东南大学, 2015. 陈晨, 蒋亚清, 潘云峰, 等. BET/XRD半定量测试水化硅酸钙含量研究[J]. 新型建筑材料, 2017, 44(3):124-126. 张储君. 矿渣粉的比表面积与粒度分布对水泥胶砂性能的影响[J]. 江西建材, 2017(5):3-4. 王伟, 王文奎, 徐兆辉, 等. 矿渣粉比表面积及粒度分布对水泥强度的影响[J]. 中国粉体技术, 2011, 17(2):80-82. LIU S H, WANG L, GAO Y X, et al. Influence of Fineness on Hydration Kinetics of Supersulfated Cement[J]. Thermochimica Acta, 2015, 605:37-42. 王功勋, 谭琳, 王佳骅, 等. 不同水胶比下钢渣粉与陶瓷抛光砖粉对水泥水化性能的影响[J]. 硅酸盐学报, 2014, 42(2):190-197. 阎培渝, 韩建国. 复合胶凝材料的初期水化产物和浆体结构[J]. 建筑材料学报, 2004(2):202-206. 韩方晖. 复合胶凝材料水化特性及动力学研究[D]. 北京:中国矿业大学, 2015. 肖红庆, 汤蕊瞳. 混凝土耐久性问题综述[J]. 工程建设与设计, 2019(15):222-224. 李悦, 李敏, 李战国, 等. 关于早龄期混凝土抗裂评价指标的综述[J]. 施工技术, 2018, 47(增刊4):265-269. -
点击查看大图
计量
- 文章访问数: 243
- HTML全文浏览量: 8
- PDF下载量: 6
- 被引次数: 0
下载:
