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High-activity low-temperature rice hull ash and high-performance concrete doped with rice hull ash
The invention discloses high-activity low-temperature rice hull ash and high-performance concrete doped with the rice hull ash. The active low-temperature rice hull ash is prepared by the following method: subjecting rice hulls to boiling water bath in 1% hydrochloric acid for 1 h, washing the rice hulls with water, then drying the rice hulls in the sun, and removing impurities in the rice hulls;firing the pretreated rice hulls in a furnace at 600-700 DEG C for 30-60 minutes, and then performing cooling; and carrying out ball milling on the fired rice hull ash in a ball mill of 500-800r/min for 10-30min to obtain the high-activity low-temperature rice hull ash of which the SiO2 content exceeds 90wt%. The high-performance concrete doped with the high-activity low-temperature rice hull ashis prepared from the following raw materials in percentage by weight: 15%-20% of Portland cement, 5%-10% of the high-activity low-temperature rice hull ash, 10%-15% of coal ash, 20%-30% of river sand,25%-35% of basalt stone, 6%-12% of water and 0.4%-1% of a water reducing agent. The rice hull ash has high purity and high activity and can effectively replace silica fume to serve as a mineral admixture, the prepared high-performance concrete is excellent in mechanical property, the cement consumption is greatly reduced while the rice hull utilization rate is increased, and the concrete cost isreduced.
本发明公开一种高活性低温稻壳灰及掺有该稻壳灰的高性能混凝土。该活性低温稻壳灰由如下方法制得：将稻壳在1％的盐酸中沸水浴1h，水洗后再晒干，除去其中杂质；将预处理完的稻壳在炉内600～700℃下烧制30～60min，随后冷却；将烧制后的稻壳灰在500～800转/分钟的球磨机中球磨10～30min，得到SiO2含量超过90wt％的高活性低温稻壳灰。掺有该高活性低温稻壳灰的高性能混凝土，由如下重量百分含量的原料组成：硅酸盐水泥15％～20％，高活性低温稻壳灰5％～10％，粉煤灰10％～15％，河砂20％～30％，玄武岩石子25％～35％，水6％～12％，减水剂0.4％～1％。本发明的稻壳灰具有高纯度和高活性，可有效替代硅灰作为矿物掺合料，制备的高性能混凝土力学性能优异，提高稻壳利用率的同时大大降低了水泥用量，降低了混凝土成本。
High-activity low-temperature rice hull ash and high-performance concrete doped with rice hull ash
The invention discloses high-activity low-temperature rice hull ash and high-performance concrete doped with the rice hull ash. The active low-temperature rice hull ash is prepared by the following method: subjecting rice hulls to boiling water bath in 1% hydrochloric acid for 1 h, washing the rice hulls with water, then drying the rice hulls in the sun, and removing impurities in the rice hulls;firing the pretreated rice hulls in a furnace at 600-700 DEG C for 30-60 minutes, and then performing cooling; and carrying out ball milling on the fired rice hull ash in a ball mill of 500-800r/min for 10-30min to obtain the high-activity low-temperature rice hull ash of which the SiO2 content exceeds 90wt%. The high-performance concrete doped with the high-activity low-temperature rice hull ashis prepared from the following raw materials in percentage by weight: 15%-20% of Portland cement, 5%-10% of the high-activity low-temperature rice hull ash, 10%-15% of coal ash, 20%-30% of river sand,25%-35% of basalt stone, 6%-12% of water and 0.4%-1% of a water reducing agent. The rice hull ash has high purity and high activity and can effectively replace silica fume to serve as a mineral admixture, the prepared high-performance concrete is excellent in mechanical property, the cement consumption is greatly reduced while the rice hull utilization rate is increased, and the concrete cost isreduced.
本发明公开一种高活性低温稻壳灰及掺有该稻壳灰的高性能混凝土。该活性低温稻壳灰由如下方法制得：将稻壳在1％的盐酸中沸水浴1h，水洗后再晒干，除去其中杂质；将预处理完的稻壳在炉内600～700℃下烧制30～60min，随后冷却；将烧制后的稻壳灰在500～800转/分钟的球磨机中球磨10～30min，得到SiO2含量超过90wt％的高活性低温稻壳灰。掺有该高活性低温稻壳灰的高性能混凝土，由如下重量百分含量的原料组成：硅酸盐水泥15％～20％，高活性低温稻壳灰5％～10％，粉煤灰10％～15％，河砂20％～30％，玄武岩石子25％～35％，水6％～12％，减水剂0.4％～1％。本发明的稻壳灰具有高纯度和高活性，可有效替代硅灰作为矿物掺合料，制备的高性能混凝土力学性能优异，提高稻壳利用率的同时大大降低了水泥用量，降低了混凝土成本。
High-activity low-temperature rice hull ash and high-performance concrete doped with rice hull ash
一种高活性低温稻壳灰及掺有该稻壳灰的高性能混凝土
RONG ZHIDAN (author) / CHEN HAO (author)
2021-03-19
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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