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高性能混凝土配合比设计中混凝土原材料及性能

发布时间:2018/7/24 10:58:16 浏览次数:257

根据海工高性能混凝土的技术要求,对象山附近的材料进行了调查和比较,选择了满足要求的混凝土原材料。水泥:为了便于控制和降低混凝土的质量,应选用波特兰水泥较少的水泥,比表面积不应超过350m2/kg,初始设定时间大于3h。通过比较和选择,使用宁海海螺P-Ⅱ42.5。确定波特兰水泥。比表面积为310 m2/kg,初始凝固时间为200分钟,终凝时间为290min,28天抗压强度为50.1 MPa。


高性能混凝土配合比设计中混凝土原材料及性能


粉煤灰:乌沙山电厂生产的Ⅰ级粉煤灰,损失率为2%,需水率为89%,三二氧化硫为0.8%;矿物粉体选用宁波海德S95矿物粉,比表面积为412 m2/kg,含水量为0.2%。28天活性指数为115%,燃烧损失0.3%,三氧化硫0.4%,细集料和细集料。严格控制砂土中泥浆和泥浆的含量。砂土中的泥和泥会增加水和掺合料的量,增加混凝土的干缩,降低混凝土的强度和耐久性。通过对比和选择,确定福建-闽江中砂的使用率为2.7,表观密度为2.7,表观密度为2580kg/m3,填料密度为1450 kg/m3,孔隙率为44%,含泥量为1.3%,含泥量为0.5%。


高性能混凝土配合比设计中混凝土原材料及性能


粗骨料:选用宁波郭沫菊5~25mm连续级配碎石,针板含量6%,粉碎值5%,含泥量0.3%,含泥量0%,表观密度为2500 kg/m3,天然填料密度1540kg/m3;减水剂:LN-SP聚羧酸缓凝剂高性能减水剂,减水率为29.2%;水:水:水:水:自水。



According to the technical requirements of the high performance concrete of the sea workers, the materials in the vicinity of Xiangshan were investigated and compared, and the concrete raw materials were selected to meet the requirements. Cement: in order to facilitate control and reduce the quality of concrete, cement should be selected with less Portland cement, the specific surface area should not exceed 350m2/kg, and the initial setting time is more than 3H. Through comparison and selection, the use of Ninghai conch P - II 42.5 Portland cement is determined. The specific surface area is 310 m2/kg, the initial setting time is 200Min, the end setting time is 290min, and the compressive strength of 28 days is 50.1 MPa.


Fly ash: I grade I fly ash, produced in usha mountain power plant, is 6.2%, the loss is 2%, the water demand ratio is 89%, and the three sulfur dioxide is 0.8%; the mineral powder is selected as the Ningbo Haide S95 mineral powder, the specific surface area is 412 m2/kg, the water content is 0.2%, the 28 day activity index is 115%, the burning loss 0.3%, the three sulfur oxide 0.4%, fine aggregate, and the fine aggregate. The content of mud and mud in sand will be strictly controlled. The mud and mud in sand will increase the amount of water and admixture, increase the dry shrinkage of concrete, and reduce the strength and durability of concrete. Through comparison and selection, it is determined that the use of Fujian Minjiang medium sand is 2.7, the apparent density is 2.7, the apparent density is 2580kg/m3, the packing density is 1450 kg/m3, the porosity is 44%, the mud content is 1.3%, and the mud content is 0.5%.


Coarse aggregate: selected Ningbo Guo meju 5 ~ 25mm continuous graded crushed stone, needle sheet content 6%, crushing value 5%, mud content 0.3%, mud content 0%, apparent density of 2700kg/m3, natural packing density 1540kg/m3; water reducing agent: LN-SP polycarboxylic acid retarding high performance water reducer, water reducing rate is 29.2%; water: water: water: water: self Water.


合肥泡沫混凝土官方网站:http://www.ahzjcl.com/



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