摘要
数字量化法配制混凝土在行业内已得到应用推广,但相关研究较少,尤其是在高强混凝土方面能否采用尚存在争议。基于新疆哈密地区戈壁砂等原材料,利用数字量化法和规范法配制C60、C70、C80高强混凝土进行对比分析,探究数字量化法在高强混凝土中的可行性及改进方法。结果表明,用数字量化法配制的高强混凝土和易性、泵送状态优于规范法;用数字量化法配制C60、C70混凝土的抗压强度满足规范要求,尤其是C60混凝土的抗压强度优于规范法,但C80混凝土的抗压强度却不达标。总体规律是随着强度等级的升高,数字量化法的抗压强度表现越差;当配制相同强度等级的混凝土时,数字量化法的收缩率明显大于规范法;且龄期越长,数字量化法配制混凝土的碳化深度比规范法大的越多;对计算方法和原材料做适当调整,数字量化法能配制出C80及更高强度混凝土;当混凝土抗压强度符合规范时,利用数字量化法配制高强混凝土的经济性更好。该研究为数字量化法在高强混凝土配制中的可行性提供了数据支持。
The digital quantification method for preparing concrete has been widely used and popularized in the concrete industry, but there are few related studies, especially in the aspect of high-strength concrete, it is still controversial. Based on the raw materials such as Gobi sand in Hami area of Xinjiang, this study used digital quantification method and standard method to prepare C60, C70 and C80 high-strength concrete for comparison, and explored the feasibility and improvement method of digital quantification method in high strength concrete. The results show that the workability and pumping state of high strength concrete prepared by digital quantization method are better than those prepared by standard method. The compressive strength of C60 and C70 concrete prepared by digital quantification method can meet the specification requirements, especially the compressive strength of C60 concrete is better than that of the specification method, but the compressive strength of C80 concrete is not up to the standard. The general rule is that with the increase of strength grade, the compressive strength of digital quantization method is worse. When the same strength grade concrete is prepared, the shrinkage rate of digital quantization method is obviously higher than that of standard method. The longer the age, the carbonation depth of concrete prepared by digital quantization method is greater than that by standard method. When the calculation method and raw materials are properly adjusted, the digital quantification method can prepare concrete with C80 and higher strength. When the compressive strength of concrete meets the standard requirements, it is more economical to prepare high strength concrete by digital quantization method. This study provides data support for the feasibility of digital quantization method in high strength concrete.
作者
刘畅
毛海涛
严新军
杨帅
张保平
LIU Chang;MAO Hai-tao;YAN Xin-jun;YANG Shuai;ZHANG Bao-ping(College of Water Conservancy and Civil Engineering,Xinjiang Agricultural University,Urumqi 830000,China;College of Urban and Rural Construction,Shanxi Agricultural University,Jinzhong 030600,China;Hami Gravity ConcreteWelfare LLC,Hami839000,China)
出处
《水电能源科学》
北大核心
2022年第11期154-158,共5页
Water Resources and Power
基金
山西省自然科学基金项目(202103021224151)
重庆市万州科学技术项目(cqwz2019005)
21世纪初高等教育教学改革基金(2021XG009)。
关键词
数字量化法
高强混凝土
和易性
抗压强度
碳化深度
收缩率
经济性
digital quantization method
high strength concrete
workability
compressive strength
carbonation depth
shrinkage rate
economy
