Acrylic-reinforced cement

Acrylic fibers, such as Dolanit, are blended in ambient-cured cement at a rate of 1-3%, compared with 9-15% by weight of asbestos. The flexural strength of cement sheets of acrylic-reinforced cement is equivalent to that of asbestos-reinforced cement and nearly double that of untreated cement, as shown in Table 12.39 [655]. 

Acrylic-modified cement coatings protect atmospherically exposed reinforced concrete structures from attack by chloride ions, oxygen and water. 

Nien YH, Huang CL. The mechanical study of acrylic bone cement reinforced with carbon nanotube. Mater Sci Eng B 2010 169 134-7. 

A relatively inexpensive bonding agent that may be used to ensure a positive bond of a new concrete overlay is a latex-reinforced cement slurry grout. Portland cement and sand (in a ratio of 1 3 by volume) are combined with a gauging liquid that is a mixture of equal volumes of water and an acrylic or polyvinyl acetate latex emulsion, as described in the table. This emulsion must be nonre-emulsifiable. The gauging hquid, based on the latex blend, is added to the cement-sand powder until a creamy paste is developed. This paste is scrubbed into the surface of the base slab, covering the surface thoroughly. New concrete is then placed on this bond hue, which is approximately M6-in thick. 

H.J. Schurhoff and A. Gerritse, Aramid reinforced concrete (ARC), aramid fibres of the twaron type, for prestressing concrete , in R.N. Swamy, R.L. Wagstaffe and D.R. Oakley (eds) Developments in Fibre Reinforced Cement and Concrete, Proc. RILEM Symp., Sheffield, RILEM Technical Committee 49-FTR, 1986, Paper 2.6. J.L. Daniel and E.D. Anderson, Acrylic fibre reinforced cement composites , in R.N. Swamy, R.L. Wagstaffe and D.R. Oakley (eds) Developments in Fibre Reinforced Cement and Concrete, Proc. RILEM Symp., Sheffield, RILEM Technical Committee 49-FTR, 1986, Paper 2.8. 

Civjan, S., Huget, E. F., Wolfhard, G. Waddell, L. S. (1972). Characteristics of zinc oxide eugenol cements reinforced with acrylic resin. Journal of Dental Research, 51, 107-14. 

Polyelectrolytes provide excellent stabilisation of colloidal dispersions when attached to particle surfaces as there is both a steric and electrostatic contribution, i.e. the particles are electrosterically stabilised. In addition the origin of the electrostatic interactions is displaced away from the particle surface and the origin of the van der Waals attraction, reinforcing the stability. Kaolinite stabilised by poly(acrylic acid) is a combination that would be typical of a paper-coating clay system. Acrylic acid or methacrylic acid is often copolymerised into the latex particles used in cement sytems giving particles which swell considerably in water. Figure 3.23 illustrates a viscosity curve for a copoly(styrene-... 

Composite resins consist of blends of large monomer molecules, filled with unre-active reinforcing filler. As such, they are hydrophobic, which means that they are unable to bond to the hydrophilic prepared tooth surface [1]. Glass-ionomer cements, by contrast, consist of aqueous solutions of polymeric acid, typically poly(acrylic add) and powdered reactive glass. These two components react together in an acid-base reaction, and thus cause the cement to set. These materials are hydrophilic, and therefore capable of wetting the prepared tooth surface and forming tme adhesive bonds. 

The use of a polymer modified cement matrix reinforced with E glass fibres was developed by Bjjen and Jacobs [99-104], using a special acrylic polymer (Forton) which was developed for that purpose. In the production of this composite, the tiny polymer latex particles ( 0.1 p.m in diameter) infiltrate and fill the spaces between the filaments in the strand and eventually coalesce into a film. Thus they can provide a protective effect, both to reduce the chemical attack, and to reduce the extent of the microstructural mechanism, by eliminating the growth of dense and rigid hydration products around the filaments. The coalescence of... 

Table 10.8 Properties of high strength acrylic fibres developed for cement reinforcement (after Hahne [125])...

Figure 12.32 Load-deflection curves in bending of polymer modified matrices (broken lines) and fibre-reinforced polymer modified cements (full lines) made of Portland cement (control) and cements modified with 18% saran (SA), styrene-butadiene (SB) and acrylic (AC) latex (after Bentur [146]).

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