Chemical Characterization of Calcium Aluminate-Phenol Resin Composite

Pushpalal, Dinil; Kawano, Tsuyoshi; Kobayashi, Tadashi; Hasegawa, Masaki

doi:10.1016/s1065-7355(97)00005-9

Cited by 14 publications

(2 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Much work on MDF has thus been devoted to providing solutions to the moisture issue. [51][52][53] The processing of the material is the other technological difficulty. At this stage, MDF objects are mainly prepared by extrusion or pressing and the green body then requires a heat treatment.…”

Section: Experimental and Theoretical Analysis Of Pce Molecular Cmentioning

confidence: 99%

Surface and Intercalation Chemistry of Polycarboxylate Copolymers in Cementitious Systems

Giraudeau

Lacaillerie

Souguir

et al. 2009

Journal of the American Ceramic Society

100

View full text Add to dashboard Cite

The Ca–Al‐layered double hydroxide, the so‐called AFm phase, is a product of cement hydration. It is shown that the interaction of this phase with anionic polycarboxylate ether (PCE)‐based dispersant polymers is not a simple adsorption but a more complex intercalation phenomenon leading to the transient sequestration of the PCE within the AFm crystallites. As a result, part of the PCE is immobilized, forming a layered organo‐mineral composite, and does not play its role of a dispersing agent. This article presents, along general considerations on the links between cement chemistry and rheology, a detailed investigation of the formation, structure, and stability of a pure poly(methacrylate‐g‐PEO)/hydrocalumite composite obtained by coprecipitation. The predictions of scaling laws derived from models of conformation of comb copolymers in solution were tested against small‐angle X‐ray diffraction, transfer of populations by double‐resonance nuclear magnetic resonance, and small‐angle neutron scattering experimental results. A model of adsorbed polymers in a configuration of a flexible chain of hemispheric cores is proposed and appears to be compatible with the observed interlayer spacings in the range of several nanometers. Finally, these phases are shown to persist for several hours in the presence of sulfate ions.

show abstract

Section: Experimental and Theoretical Analysis Of Pce Molecular Cmentioning

confidence: 99%

Surface and Intercalation Chemistry of Polycarboxylate Copolymers in Cementitious Systems

Giraudeau

Lacaillerie

Souguir

et al. 2009

Journal of the American Ceramic Society

100

View full text Add to dashboard Cite

show abstract

“…Mixture was subjected to high shear mixing, and was then calendared between rolls so as to develop microstructure consisting of close-packed, residue unhydrated cement particles closely coupled to a binder matrix [10]. Pressure forming was needed in the process to remove trapped air [7] and lamination defects [11]. High temperature curing (80°C) was applied to promote cross linking of the polymer [5].…”

Section: Polymer Cement Composite (Pcc)mentioning

confidence: 99%

Tensile Strength versus Toughness of Cement-Based Materials against High-Velocity Projectile Impact

Wang

Zhang

Quek

2011

International Journal of Protective Structures

View full text Add to dashboard Cite

This paper presents a laboratory experimental study on the effect of tensile strength and toughness on the resistance of cement-based materials to high-velocity projectile impact. Three types of cement-based materials with similar compressive strength but different tensile strengths and toughnesses were examined in terms of the penetration depth, crater diameter, and crack propagation in specimens subjected to impact of ogive-nosed projectile with a diameter of 13.35 mm and a mass of 19 grams traveling at velocities of about 650 m/s. The materials evaluated include: (i) a plain high-strength concrete (HSC) with low tensile strength and toughness, (ii) a fiber-reinforced concrete (FRHSC) with high toughness but similar flexural tensile strength as the HSC, and (iii) a polymer cement composite (PCC) with high flexural tensile strength but low toughness. The PCC was developed from a combination of inorganic cements with water-soluble polymers, and it had a 28-day flexural tensile strength of 25 MPa. Results suggest that the toughness was a more important parameter that contributes to the impact resistance of the cement-based materials. Increasing the tensile strength alone, however, did not seem to contribute to the impact resistance of the cement-based materials.

show abstract