Rice husks were incinerated at temperatures below 750°C, yielding an amorphous ash with a significant carbon content that was thereupon grinded for 18 hours in a laboratory ball mill in combination with a naphthalene-based superplasticizer. The grinding resulted in a structural collapse of the porous ash particles, dramatically reducing BET specific surface area. For the concrete specimens with PC contents between 260 and 400 kg/m~3 and significant RHA additions, compressive strength values were obtained exceeding 50 MPa at 7 days, 70 MPa at 28 days and 80 MPa at 180 days. The mortar specimens yielded compressive strength values exceeding at ages of 3, 7, 28 and 182 days respectively 20, 30, 45 and 50 MPa.
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机译：在低于750°C的温度下焚烧稻壳，产生具有显着碳含量的无定形灰，随即在实验室球磨机中与萘基高效减水剂一起研磨18小时。研磨导致多孔灰分颗粒的结构塌陷，大大降低了BET比表面积。对于PC含量在260至400 kg / m〜3之间且添加大量RHA的混凝土试样，其抗压强度值在7天时超过50 MPa，在28天时超过70 MPa，在180天时超过80 MPa。砂浆样品的抗压强度值分别在3、7、28和182天时分别超过20、30、45和50 MPa。
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