高等级公路混凝土实现高折压比的配合比设计

An Optimal Mix Design of High-grade Highway Concrete with High Bend-press Ratio

提出了高等级公路路面混凝土实现高折压比的配合比设计方法。通过大量试验,分析了掺加抗折剂后混凝土的技术特性,结果表明,要获得抗弯拉强度高、成本经济的混凝土配合比,需从单位水泥用量、抗折剂掺量、抗折剂品种与水泥的适应性等方面综合考虑。通过合理使用抗折剂,在减少水泥用量同时,优化的配合比设计能使混凝土7 d抗弯拉强度达到6.00—7.00 MPa以上,28 d能达到7.00—8.00 MPa以上。

An optimal mix design method is developed to obtain the high-grade highway concrete with high bend-press ratio. The properties of the pavement cement with the anti-break admixture are achieved in the presented study. It is indicated that some factors should be taken into account to obtain the economy pavement cement with high flexural strength according to the presented test results. The factors include the quantity of the cement, the amount of the anti-break admixture, and the compatibility between the anti-break admixture and the cement. Using the reasonable amount of the anti-break admixture and the reduced quantity of the cement, the presented optimal mix design can raise flexural strength of concrete to more than 6.00- 7.00 MPa at 7 d age and 7.00-8.00 MPa at 28 d age respectively.