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Development Of Lightweight Aggregate Concrete Containing Pulverized Fly Ash And Bottom Ash

机译：粉煤灰和底灰的轻质骨料混凝土的研制

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This study examines the feasibility of using different lightweight aggregates (LA) and bottom ash as coarse and fine aggregates in concrete with fly ash. The lightweight materials were composed of 3 types, namely pumice, cellular lightweight aggregate and MTEC lightweight aggregate. The tests for physical and mechanical properties of lightweight aggregate concretes (LWAC) were conducted in terms of workability, compressive strength, apparent density, abrasion resistance and absorption. Test results showed that compressive strength of LWAC increased with an increase in apparent density, which is mainly depending on the type of aggregate. The replacement of normal weight sand with bottom ash resulted in a decrease both in density of concrete by 180-225 kg/m3 and 28-day compressive strength of concrete by 16-26%. Moreover, the use of bottom ash to replace sand in concrete increased the demand for mixing water due to its porosity and shape and to further obtain the required workability. The type and absorption of LA influenced predominantly the water absorption of LWAC. Total replacement of natural sand by bottom ash increased the absorption of the concrete by 63-90%. With regard to abrasion resistance, the abrasion resistance of lightweight aggregate concrete was mainly dependent on the compressive strength of concrete: the higher the strength, the higher the abrasion resistance of LWAC. In addition, the use of bottom ash as a fine aggregate resulted in a lower abrasion resistance of lightweight aggregate concrete due to its porosity. Of the three types of lightweight materials, MTEC LA had achieved both low density and high compressive strength.
机译：这项研究研究了在粉煤灰混凝土中使用不同的轻质骨料（LA）和底灰作为粗骨料和细骨料的可行性。轻质材料由浮石，蜂窝状轻质骨料和MTEC轻质骨料三种类型组成。对轻质骨料混凝土（LWAC）的物理和机械性能进行了可加工性，抗压强度，表观密度，耐磨性和吸收性测试。试验结果表明，LWAC的抗压强度随表观密度的增加而增加，这主要取决于骨料的类型。用底灰代替普通重量的沙子导致混凝土密度降低180-225 kg / m3，同时28天抗压强度降低16-26％。此外，使用底灰代替混凝土中的沙子由于其孔隙率和形状并进一步获得所需的可加工性而增加了对混合水的需求。 LA的类型和吸收主要影响LWAC​​的吸水率。用底灰完全替代天然砂，使混凝土的吸收率提高了63-90％。关于耐磨性，轻骨料混凝土的耐磨性主要取决于混凝土的抗压强度：强度越高，LWAC的耐磨性越高。另外，使用底灰作为细骨料由于轻质骨料的多孔性而导致较低的耐磨性。在这三种轻质材料中，MTEC LA既达到了低密度又具有高的抗压强度。

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