纤维增强对刚性路面和机场路面修补混凝土收缩的影响

S. Kroviakov, V. Kryzhanovskyi
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引用次数: 0

摘要

摘要研究了钢锚纤维配筋对刚性机场路面改性混凝土收缩性能的影响。进行了2因素试验,其组成因素为:硬化促进剂Sika Rapid 3的掺量为水泥含量的0 ~ 2.4% (0 ~ 9.6 kg/m3);直径1mm、长度50mm的钢锚纤维用量为0 ~ 100kg /m3。对于混凝土的配料分别采用:波特兰水泥CEM II / AS 42.5的用量为400 kg/m3,花岗岩碎石5-20 mm,石英砂,增塑剂外加剂巴斯夫镁SKY 608的用量按水泥掺量1.2%计算。混合物的和易度为S2 (6-8 cm);W/C比取决于混凝土成分。由于使用了高效减水剂,所研究的混合物的W/C在0.309-0.343之间。在空气干燥条件下,分别记录3小时、6小时、1、2、3、7天后棱镜试样的收缩率。混凝土硬化7天后,收缩过程并未结束,但各种因素对其数值影响的一般性质仍然存在。已确定纤维量为50 kg/m3和纤维量为100 kg/m3的纤维增强混凝土比未加筋混凝土的收缩率降低10-15%。纤维掺量为50 kg/m3和100 kg/m3时,复合材料的收缩率基本相同,这可以解释为随着纤维掺量的增加,W/C比增加。硬化促进剂的掺量对混凝土收缩量的影响不明显。加入Sika Rapid 3后,7天龄期混凝土收缩率降低2-9%。这种效应可以用以下事实来解释:结构形成过程中产生的内应力和混凝土中的水分损失被包含在更耐用的水泥-砂基质中。在不添加纤维和促进剂的情况下,测定了98 d龄期混凝土的收缩率。结果表明,该混凝土的极限收缩率为:2.5×10-4。实验统计模型分析表明,当金属纤维掺量为60 ~ 90 kg/m3,硬化促进剂掺量为0.9 ~ 2.4%时,所研究混凝土的收缩率最小( 7 = 1.3×10-4)。因此,使用带锚钢纤维和硬化促进剂的纤维增强材料可以显著降低混凝土的收缩,对于刚性机场路面的修复具有重要意义。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
INFLUENCE OF FIBER REINFORCEMENT ON CONCRETE SHRINKAGE FOR RIGID ROAD AND AIRFIELD PAVEMENT REPAIR
Abstract. The influence of fiber reinforcement with steel anchor fiber on the shrinkage of modified concrete for rigid airfield pavements repair has been determined. A 2-factor experiment was carried out, in which the following composition factors were varied: the amount of hardening accelerator Sika Rapid 3 from 0 to 2.4% of the cement content (0-9.6 kg/m3); the amount of steel anchor fiber with 1 mm diameter and 50 mm length, from 0 to 100 kg/m3. For the concrete batching were used: Portland cement CEM II / AS 42.5 in the amount of 400 kg/m3, granite crushed stone 5-20 mm, quartz sand, plasticizer admixture BASF MasterGlenium SKY 608 in the amount of 1.2% by cement content. The workability of the mixtures was S2 (6-8 cm); W/C ratio depended on the concrete composition. Due to the use of superplasticizers, the W/C of all investigated mixtures was in the range of 0.309-0.343. The shrinkage of the prism specimens was recorded after 3 hours, 6 hours, 1, 2, 3 and 7 days of being in air-dry conditions. The shrinkage process does not end after 7 days of concrete hardening, however, the general nature of the influence of variable factors on its value remains. It has been established that fiber-reinforced concretes, with a fiber amount of 50 kg/m3 and with a fiber amount of 100 kg/m3, have 10-15% less shrinkage compared to unreinforced concretes. Compositions with a fiber amount of 50 kg/m3 and 100 kg/m3 have practically the same shrinkage, which is explained by an increase in W/C ratio with an increase in the amount of fiber reinforcement. The amount of hardening accelerator has a less noticeable effect on the amount of concrete shrinkage. By adding Sika Rapid 3, concrete shrinkage at the age of 7 days is reduced by 2-9%. This effect can be explained by the fact that internal stresses arising in the process of structure formation and moisture loss in concrete are contained in a more durable cement-sand matrix. The concrete shrinkage without fiber and accelerator was also measured up to the age of 98 days. It was found that the limiting shrinkage for such concrete is 2.5×10-4. The analysis of the drawn experimental-statistical model showed that with the amount of metal fiber from 60 to 90 kg/m3 and the amount of the hardening accelerator from 0.9 to 2.4%, the shrinkage of the investigated concretes is minimal (7 = 1.3×10-4). Thus, the use of fiber reinforcement with anchor steel fiber and a hardening accelerator can significantly reduce the concrete shrinkage for the rigid airfield pavements repair is important for this material.
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