Low water demand binder technology for environmental friendly cements with low clinker content

Title: Low water demand binder technology for environmental friendly cements with low clinker content
Author(s): Falikman V.R., and Bashlykov N.F.
Paper category : conference
Book title: International RILEM Conference on Advances in Construction Materials Through Science and Engineering
Editor(s): Christopher Leung and K.T. WAN
ISBN: 978-2-35158-116-2
e-ISBN: 978-2-35158-117-9
Publisher: RILEM Publications SARL
Publication year: 2011
Pages: 633 - 642
Total Pages: 10
Nb references: 10
Language: English

Abstract: New alternative mechanical-chemical activated binders with high content of different mineral additives were investigated, and their relative position to Portland cement compared.

Low water demand binders (LWDB) consist of interground components: Portland cement clinker (PCC), modifier (M) that includes dry superplasticizer (S), gypsum, active and/or inert mineral additions. LWDB foundations and properties are the objective of this report.

The results of investigations allow making a tentative conclusion about technical possibility to obtain high strength LWDB from clinker and high amount of mineral additives (50% by mass and more). Efficiency of mechanical-chemical interaction was evaluated by comparison of physical-mechanical properties of LWDBs having various content of modifier with analogous properties of Portland cement; both materials had similar granulometry by Blaine. Results of the experiment show that water demand of binder reduces, and its strength increases while dosage of modifier is being increased. At the same time it can be observed that they have shortened initial and final setting time.

Strength of concrete made of LWDB with 70% blast furnace slag, and of LWDB with 55% of sea sand, and of LWDB with 35% of limestone is slightly lower than strength of control concrete based on normal Portland cement. Concrete made of LWDB with 55% of trass has the less strength. It is possible to increase strength of the last concrete while consumption of LWDB being increased by 10...15 %.

The specific consumption of aggregates (SCA) difference between NPC and LWDB (max. 13 vs. max. 27) is so great that it enables to regard LWDBs as a new generation of cements. The cause is S-grafting on cement surface. LWDB changes radically strength properties of cementitious materials because LWDB/aggregate energy is closed to polymer binder/aggregate energy. The technological process of LWDB production is simple just enough and practically universal. Whereas almost any binders can be produced in the form of LWDBs these binders can be considered as new generation not only of Portland cement, but also of lime, gypsum, slag cements, alumina cements and others.

Online publication: 2011-10-31
Publication type : full_text
Public price (Euros): 0.00