二次碎石混凝土是一种很有前途的刚性路面基层材料

S. Kroviakov, A.O. Chystiakov, А.О. Bershadskyi, T. Shevchenko
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引用次数: 0

摘要

在研究过程中,确定了不同类型增塑剂在公路二次碎石基层混凝土中的应用效率。在混凝土成分的研究中,二级或花岗岩碎石的类型发生了变化,从而可以将二级碎石上的混凝土性能与花岗岩碎石上类似成分的混凝土性能进行比较。此外,沙子的类型发生了变化:比利耶夫斯基采石场或沃兹涅先斯基采石场。改性剂采用木质素磺酸盐或聚羧酸酯型高效减水剂MC-PowerFlow 3200。所有混凝土混合料的流动性P2相等,这是由W/C(水灰比)变化提供的。研究发现,由于粗集料的孔隙率和表面损伤较大,二级碎石上的混凝土具有明显较高的W/C混合料的特征。二级碎石上混凝土的平均密度比花岗岩碎石上混凝土的平均密度低4.2-4.4%。Voznesenski采石场大砂石上的混凝土平均密度比Bilyaevsky采石场类似砾石和细砂石上的混凝土平均密度高25-30 kg/m3。在CEM III/A复合材料中,使用磺胺磺酸盐添加剂,二次碎石混凝土的抗压强度比花岗岩碎石和类似砂混凝土的抗压强度低12-13%。然而,当使用更高效的MC-PowerFlow 3200添加剂时,二级和花岗岩碎石上的混凝土强度差异仅为5.4%(分别为29.8 MPa和31.4 MPa)。沃兹涅先斯基采石场砂石上的混凝土强度比比利耶夫斯基采石场砂石和细砂上的混凝土强度高4-6%。结果表明,MC-PowerFlow 3200在二次和花岗岩砾石上抗弯混凝土的抗拉强度分别为2.75 MPa和2.87 MPa,两者差异仅为4%。因此,二次碎石上弯曲混凝土的抗拉强度与花岗岩碎石上类似混凝土的抗拉强度几乎没有差异。这可以用具有多孔表面的骨料的特性来解释,其特征是与水泥-砂基质的高粘附性。一般来说,使用含渣水泥的二次碎石上的混凝土强度使它们能够有效地用于道路基础。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
CONCRETES ON SECONDARY CRUSHED STONE AS A PROMISING MATERIAL FOR THE RIGID PAVEMENT BASE
In the course of research, the efficiency of application of plasticizers of different type in concretes for bases of highways on secondary crushed stone is defined. In studies of concrete compositions, the type of crushed stone, secondary or granite, changed, which allowed to compare the properties of concrete on secondary crushed stone with the properties of concrete of similar composition on granite crushed stone. In addition, the type of sand changed: Bilyaevsky or Voznesenski quarry. As modifiers used additive lignosulfonate or superplasticizer polycarboxylate type MC-PowerFlow 3200. All concrete mixtures had equal mobility P2, which was provided by variation W/C (water-cement ratio). It was found that the concrete on the secondary crushed stone is characterized by a significantly higher W/C mixture due to greater porosity and damage to the surface of the coarse aggregate. The average density of concrete on secondary crushed stone is 4.2-4.4% lower compared to the average density of concrete on granite crushed stone. The average density of concrete on the larger sand of the Voznesenski quarry is 25-30 kg/m3 higher than the average density of concrete on similar gravel and finer sand of the Bilyaevsky quarry. In composites based on CEM III/A and using lingosulfonate additives, the compressive strength of concrete on secondary crushed stone is 12-13% lower compared to the strength of concrete on granite crushed stone and similar sand. However, when using the more efficient MC-PowerFlow 3200 additive, the difference in concrete strength on secondary and granite crushed stone is only 5.4% (29.8 MPa and 31.4 MPa, respectively). The strength of concrete on the sand of the Voznesenski quarry is 4-6% higher than the strength of concrete on similar gravel and finer sand of the Bilyaevsky quarry. It was found that the tensile strength when bending concrete on secondary and granite gravel when using the additive MC-PowerFlow 3200 was 2.75 MPa and 2.87 MPa, respectively, which differs by only 4%. Thus, the tensile strength of bending concrete on secondary crushed stone was almost no different from the tensile strength of similar concrete on granite crushed stone. This can be explained by the peculiarities of the aggregate with a porous surface, which is characterized by high adhesion to the cement-sand matrix. In general, the strength of concrete on secondary crushed stone using slag-containing cements allows them to be used effectively for road bases.
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