Kos Željko, Kroviakov Sergii, Mishutin Andrii, Poltorapavlov Andrii
Department of Civil Engineering, University North, University Centre of Varaždin, 104. Brigade 3, 42000 Varazdin, Croatia.
Department of Highways and Airfields, Odesa State Academy of Civil Engineering and Architecture, Didrichson Street 4, 65029 Odesa, Ukraine.
Materials (Basel). 2023 Aug 28;16(17):5886. doi: 10.3390/ma16175886.
The complex effect of the amount of cement, polypropylene fiber (the fiber length was 39 mm, and the diameter was 0.45 mm), and polycarboxylate superplasticizer on concrete properties for rigid pavement was determined using the methods of experiment planning and experimental-statistical modeling. The fluidity of all the mixtures was S1. The W/C of the mixtures depended on the composition of the concrete and variable from 0.32 to 0.46. It was found that, by increasing the amount of superplasticizer from 1% to 1.8-2%, the compressive strength of concrete increased by 4.5-6 MPa after 3 days and by 7-9 MPa after 28 days. The flexural strength in this case increased by 0.6-0.9 MPa. The use of polypropylene fiber in the amount of 1.5-1.8 kg/m increased the compressive strength of concrete by an average of 3 MPa, increased the flexural strength by 0.5-0.6 MPa, reduced the abrasion capacity by 9-14%, and increased the frost resistance by up to 50 cycles. When using a rational amount of superplasticizer and fiber, the compressive strength of concrete, even with a minimum cement amount of 350 kg/m, was at least 65 MPa, its flexural strength was at least 6 MPa, its frost resistance was F200, and its abrasion capacity was not more than 0.30 g/cm. Concrete with such properties can be used for roadways of any type. Low abrasion capacity and high frost resistance provide the necessary durability of concrete for rigid pavement during operation.
采用试验规划和试验统计建模方法，确定了水泥用量、聚丙烯纤维（纤维长度为39mm，直径为0.45mm）和聚羧酸高效减水剂对刚性路面混凝土性能的综合影响。所有混合料的流动性均为S1。混合料的水灰比取决于混凝土的组成，范围为0.32至0.46。结果发现，将减水剂用量从1%增加到1.8 - 2%后，混凝土3天抗压强度提高了4.5 - 6MPa，28天抗压强度提高了7 - 9MPa。此时抗折强度提高了0.6 - 0.9MPa。使用1.5 - 1.8kg/m的聚丙烯纤维，混凝土抗压强度平均提高3MPa，抗折强度提高0.5 - 0.6MPa，耐磨性能降低9 - 14%，抗冻性提高多达50次循环。当使用合理用量的减水剂和纤维时，即使水泥用量最低为350kg/m，混凝土的抗压强度至少为65MPa，抗折强度至少为6MPa，抗冻性为F200，耐磨性能不超过0.30g/cm。具有这种性能的混凝土可用于任何类型的道路。低耐磨性能和高抗冻性为刚性路面混凝土在使用过程中提供了必要的耐久性。
