Pressed lightweight concrete containing calcined diatomite aggregate
Pressed lightweight concrete containing calcined diatomite aggregate
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DOI：
10.1016/j.conbuildmat.2013.05.094
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发表时间：
2013-10
影响因子：
7.4
通讯作者：
Patcharapol Posi;Surasit Lertnimoolchai;Vanchai Sata;P. Chindaprasirt
中科院分区：
文献类型：
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作者：
Patcharapol Posi;Surasit Lertnimoolchai;Vanchai Sata;P. Chindaprasirt
天然形式的硅藻土具有低反应性，是一种弱材料。煅烧去除了可燃元素，提高了耐火材料的性能。本研究探讨含煅烧粗集料之轻集料混凝土之特性。将骨料粉碎并分类为细、中和粗骨料，然后在400-1000 °C下煅烧4小时。得到了28天抗压强度为7.8- 12.9MPa、密度为1000-1200 kg/m3、孔隙率为58- 61%、吸水率为61-72%、导热系数为0.15- 0.19W/mK的轻骨料混凝土。采用1000 °C高温煅烧得到的粗骨料和600 °C高温煅烧得到的细骨料，可制得轻质高强砌块。在1000 °C的高温下，粗骨料稳定且坚固，这有助于压制轻质混凝土的强度。在600 °C的煅烧温度下，细硅藻土聚集体是反应性的。煅烧水泥是一种适合制作压制轻质混凝土砌块的轻质骨料。
Diatomite in its natural form possesses low reactivity and is a weak material. Calcination rids of the burnable elements and enhances the properties of diatomite. This research studies the properties of pressed lightweight concrete containing calcined diatomite aggregate. The diatomite was crushed and classified as fine, medium and coarse aggregates and then calcined at 400–1000 °C for 4 h. The pressed lightweight concretes with 28-day compressive strength of 7.8–12.9 MPa, density of 1000–1200 kg/m3, porosity of 58–61%, water absorption of 61–72% and thermal conductivity of 0.15–0.19 W/mK were obtained. The light weight and high strength blocks were obtained with the use coarse diatomite aggregate obtained from high calcined temperature of 1000 °C and the use of fine diatomite aggregate obtained from calcination temperature of 600 °C. At the high temperature of 1000 °C, the coarse aggregate was stable and strong and this contributed to the strength of the pressed lightweight concrete. At the calcination temperature of 600 °C, the fine diatiomite aggregate was reactive. Calcined diatomite is a suitable lightweight aggregate for making pressed lightweight concrete blocks.