论文部分内容阅读
本文叙述了用低标号水泥修筑混凝土路面试验路的设计、试验和施工情况。铺筑试验路的目的,在于探索用地方小水泥厂生产的低标号水泥(325号或以下)修筑路面的技术措施、设计方法和施工工艺及其实际使用效果。文中介绍的主要措施是:在强度方面充分挖掘混凝土后期强度增长的潜力,引用3～4个月的后期强度(90天龄期比28天龄期的允许抗折强度提高15～20％);路面设计荷载一般均按使用期可能通行的重车作为设计标准;在施工方法上主要是采用干硬性混凝土或真空吸水工艺。试验研究表明,水泥标号不宜过低,以接近325号(软炼)为宜。对混凝土配比设计要进行多次计算、调整和室内试验工作,以寻求经济合理的配比。室内外试验表明,无论抗折强度和抗压强度均能满足设计要求。经过一年多行车考验,实际使用效果较好。
This paper describes the design, testing and construction of concrete pavement test roads with low-grade cement. The purpose of paving the test road is to explore technical measures, design methods, construction techniques and practical effects of pavement construction using low-grade cement (No. 325 or below) produced by local small cement factories. The main measures introduced in this article are: to fully tap the potential of late strength growth of concrete in terms of strength, and to apply the late strength of 3 to 4 months (the allowable flexural strength of 90 days is 15 ~ 20% higher than that of 28 days). Pavement design load are generally used by the heavy truck may pass the design period as the standard; in the construction method is mainly dry hard concrete or vacuum water absorption process. Experimental studies have shown that the cement label should not be too low, close to 325 (soft) is appropriate. The ratio of concrete design should be repeated calculations, adjustments and laboratory tests in order to seek economic and reasonable ratio. Indoor and outdoor tests show that both the flexural strength and compressive strength can meet the design requirements. After more than a year driving test, the actual use of better.