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首页> 外文期刊>American Journal of Chemical Engineering >Setting Times of Portland Cement Blended with Locust Bean Pod and Eggshell Ashes
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Setting Times of Portland Cement Blended with Locust Bean Pod and Eggshell Ashes

机译：与蝗虫豆荚和蛋壳灰烬混合的波特兰水泥设定

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This paper investigates the potentials of replacing cement with Locust beans pod ash (LBPA) and Eggshell ash (ESA) on the setting time properties of cement blends such as consistency and initial and final setting times. It also covers a comparative analysis on consistency and setting time results of the cement blends and control. The consistency and setting times of control and twenty-eight (28) cement blends were conducted via Vicat apparatus and Toniest machine respectively according to ASTM standards. The locust bean pod and eggshell powder were calcined at 850°C and 500°C for 1 hour respectively to obtain the LBPA and ESA. Results indicated a variation in the water consistencies of cement blended with either/both ashes at various LBPA/LBPA-ESA ratios as cement replacement was increased from 0-10 wt.%. The increase in the water consistencies could be attributed to the diminution of C_(3)S in cement, the unburnt carbon present in the ashes coupled with the porous nature of LBPA and narrower particle size distributions of the cement blends. Whereas, the decrease in the water consistency could be linked with wider particle size distribution. The initial setting times of LBPA cement blends experienced a series of retardations and acceleration while the final setting time experienced a series of accelerations and elongations as the cement replacement was increased. On the other hand, as the cement replacement level was increased, the initial and final setting time of ESA cement blends experienced a retardation followed by accelerations and a series of accelerations and retardations respectively. Similarly, the replacement of ESA with LBPA at various cement replacement led to a variation in both setting times (series of accelerations and retardations) of cement blends. The retardation in the setting times could be linked to the diminution of clinker content or formation of magnesium hydroxide Mg(OH)_(2), the presence of unburnt carbon in ashes and narrower particle size distribution of the cement blends while the acceleration of the setting times are related to interaction between tricalcium aluminate and limestone to favor ettringite at the expense of monosulfate and a wider particle size distribution of the cement blends. Most of the setting time results for cement blends except 7.5 and 10 wt.% LBPA cement blends were higher than control and all the cement blends were found to fall within standards for various applications.
机译：本文研究了用蝗虫豆荚（LBPA）和蛋壳灰（ESA）在水泥共混物的设定时间特性上取代水泥的潜力，例如一致性和初始凝固时间。它还涵盖了水泥共混物的一致性和设定时间结果的比较分析。根据ASTM标准，通过VICAT设备和最佳机器进行控制和二十八（28）个水泥混合物的一致性和设定时间。刺槐豆荚和蛋壳粉末在850℃和500℃下煅烧1小时，得到LBPA和ESA。结果表明，随着水泥置换率的各种LBPA / LBPA-ESA比率，水泥与灰烬中的水泥的水恒定的变化从0-10重量％增加。水浓度的增加可能归因于水泥中的C_（3）S的减少，灰烬中存在的Unburnt碳与LBPA的多孔性质和水泥共混物的较窄粒度分布。鉴于水一致性的降低可以与较宽的粒度分布连接。 LBPA水泥混合物的初始设定时间经历了一系列延迟和加速，而最终设定时间经历了一系列加速度和伸长率，随着水泥更换的增加。另一方面，随着水泥更换水平增加，ESA水泥混合物的初始和最终设定时间经历了延迟，然后分别延伸，分别加速和一系列加速度和延迟。类似地，在各种水泥替换物中用LBPA替换ESA导致水泥共混物的设定时间（系列加速度和延迟）的变化。设定时间中的延迟可以与熟料含量的减少或氢氧化镁Mg（OH）_（2）的形成相关联，灰烬中的碳含量和水泥共混物的较窄粒度分布同时加速设定时间与铝酸钙和石灰石之间的相互作用有关，以牺牲单硫酸盐的牺牲和水泥共混物的较宽粒度分布。除了7.5和10重量％的水泥混合物的大部分设定时间结果。％LBPA水泥共混物高于对照，发现所有水泥共混物都落入各种应用的标准中。

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