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|Author(s):||Dale P. Bentz; J T. Conway;|
|Title:||Computer Modeling of the Replacement of Coarse Cement Particles by Inert Fillers in Low W/C Ratio Concretes: Hydration and Strength|
|Published:||March 01, 2001|
|Abstract:||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.|
|Citation:||Cement and Concrete Research|
|Pages:||pp. 503 - 506|
|Keywords:||blended cements,compressive strength,hydration,modeling,particle size distribution|
|Research Areas:||Building and Fire Research|
|PDF version:||Click here to retrieve PDF version of paper (290KB)|