High performance cements by pressing : Physical and engineering performance of pore reduced cement (PRC)

Title: High performance cements by pressing : Physical and engineering performance of pore reduced cement (PRC)
Author(s): D. E. Macphee, E. Lachowski
Paper category : conference
Book title: International RILEM Workshop on Durability of High Performance Concrete
Editor(s): H. Sommer
Print-ISBN: 2-912143-03-9
e-ISBN: 2351580125
Publisher: RILEM Publications SARL
Publication year: 1994
Pages: 47 - 58
Total Pages: 12
Nb references: 11
Language: English

Abstract: Pore reduced cements (PRC) are a series of cement-based products made by the compaction of immature cement pastes which have been mixed at normal waterlcement (w/c) ratios (typically 0.35)'~~. The relationship between paste porosity and mechanical performance has been known for some time and exploitation of this relationship has led to the development of several low-porosity cement-based products including macro-defect free (MDF)~,~ and densified small particle (DSP)' cements. Research on MDF products still continues in efforts to overcome the concerns relating to poor durability arising from post-hardening water attack on the polymer filler used to occupy the intrinsic porosity of the cement matrix6. DSP products have better durability but incorporate appreciable amounds of microsilica and necessary plasticisers, the long term performances of which are largely unknown. PRC contains no plasticising or polymer additives so that the compressed product consists only of compacted cement grains in a matrix of calcium silicate hydrate (C-S-H) gel. The compacted nature of PRC is likely to encourage the blocking of the already low porosity by calcium carbonate deposition, particularly at the surfaces, effectively sealing the interior, giving potentially good durability.

Online publication: 1996-02-02
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2351580125.006