摘要
多孔混凝土作为新型的排水基层材料,抗冻性是其耐久性的重要体现,良好的抗冻性是多孔混凝土用于冰冻地区的前提。在分析现有普通混凝土抗冻性试验方法与评价指标的基础上,针对多孔混凝土自身的结构特点及工作状态,采用快冻法,使冻融循环次数分别为25,50,75和100次进行4种级配多孔混凝土的抗冻性试验,并采用抗冻系数作为评价多孔混凝土抗冻性的指标。结果表明,级配1与级配4,级配2与级配3具有类似的抗冻性,前者冻融循环50次后抗冻系数约为40%,后者冻融循环100次后抗冻系数仍大于70%,前者明显低于后者,且抗冻系数分别随着冻融循环次数的增加而降低。可见,对于北方冰冻地区,宜采用级配2或级配3多孔混凝土。
Porous concrete is a new kind of drainage base material. Frost resistance is its important expression of durability and porous concrete used in cold region should have good performance of frost resistance. Based on analyzing the existing experiment method and evaluation indexes of normal concrete, according to the structure characteristic and service condition, adopting quick freezing method, four kinds of porous concrete were carried out frost resistance test with cycle of freezing and thawing of 25, 50, 75 and 100 and coefficient of frost resistance was taken as the evaluation target. Test results show that gradation 1 and gradation 4, gradation 2 and gradation 3 have the similar performance of frost resistance; the frost resistance coefficient of the former is about 40% when the cycle of freezing and thawing is 50 and the coefficient of the latter is still larger than 70% when the cycle is 100. Besides, the former is much smaller than the latter and the frost resistance coefficient decreases with the increase of cycle of freezing and thawing. Therefore, porous concrete of gradation 2 and gradation 3 are suitable in northern cold region.
出处
《混凝土》
CAS
CSCD
北大核心
2007年第2期31-33,共3页
Concrete
基金
陕西省自然科学基础研究计划资助项目(2005E207)
长安大学科技发展基金项目(05Q03)
关键词
道路工程
基层
多孔混凝土
抗冻性
快冻法
抗冻系数
road engineering
base
porous concrete
frost resistance
quick freezing method
coefficient of frost resistance
