Computer modeling of the replacement of "coarse" cement particles by inert fillers in low w/c ratio concretes - Hydration and strength
Computer modeling of the replacement of "coarse" cement particles by inert fillers in low w/c ratio concretes - Hydration and strength
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DOI：
10.1016/s0008-8846(01)00456-2
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发表时间：
2001-03-01
影响因子：
11.4
通讯作者：
Conway, JT
中科院分区：
文献类型：
--
作者：
Bentz, DP;Conway, JT
在水-水泥（w/c）比低于约0.38的混凝土中，由于材料内的空间限制，一部分水泥颗粒将始终保持未水合。因此，在目前生产的许多高性能混凝土中，水泥熟料实际上被浪费了。本函探讨了用惰性填料替代水泥粉末中较粗部分的可能性，以在不牺牲材料性能的情况下保存水泥。使用NIST CEMHYD 3D水泥水化模型，它表明，对于“初始”的w/c比为0.25和0.30，一部分较粗的水泥颗粒可以被惰性填料取代，在抗压强度的发展几乎没有预计的损失。当然，最佳置换率取决于初始水灰比，这表明混合波特兰/惰性填料水泥需要在考虑最终混凝土混合物比例的情况下生产。这进一步意味着特定比例的水泥/惰性混合物仅在有限的混凝土混合物比例范围内表现最佳。(C)2001爱思唯尔科技有限公司版权所有。
In concretes with water-to-cement (w/c) ratios below about 0.38, a portion of the cement particles will always remain unhydrated due to space limitations within the material. Thus, in many of the high-performance concretes currently being produced, cement clinker is in effect being wasted. This communication examines the possibility of replacing the coarser fraction of a cement powder by an inert filler, to conserve cement without sacrificing material performance. Using the NIST CEMHYD3D cement hydration model, it is demonstrated that for "initial" w/c ratios of 0.25 and 0.30, a portion of the coarser cement particles can be replaced by inert fillers with little projected loss in compressive strength development. Of course, the optimal replacement fraction depends on the initial w/c ratio, suggesting that blended portland/inert filler cements need to be produced with the end concrete mixture proportions in mind. This further implies that a cement/inert mixture of specific proportions will only perform optimally in a limited range of concrete mixture proportions. (C) 2001 Elsevier Science Ltd. All rights reserved.