Reactions in the Setting of High Strength Cement Pastes

Rodger, S. A.; Sinclair, W.; Groves, G. W.; Brooks, S. A.; Double, D. D.

doi:10.1557/proc-42-45

Cited by 11 publications

(11 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It proves the chemical interaction between the monocalcium aluminate and polymer. According to the main hypothesis of reaction mechanisms, the hydroxyl groups of PVA are crosslinked with the aluminate ions (Al(OH) 4 − ) released during the hydration reaction of the CA phase [22][23][24], which also explains the slight decrease in C\OH contribution compared to the primary PVA. The Ca 2p spectrum of activated CA shows two different kinds of calcium.…”

Section: Resultsmentioning

confidence: 99%

XPS characterization of polymer–monocalcium aluminate interface

Kalina¹,

Másilko²,

Koplík³

et al. 2014

Cement and Concrete Research

View full text Add to dashboard Cite

Section: Resultsmentioning

confidence: 99%

XPS characterization of polymer–monocalcium aluminate interface

Kalina¹,

Másilko²,

Koplík³

et al. 2014

Cement and Concrete Research

View full text Add to dashboard Cite

“…Further details of the processing (Birchall, 1983), microstructure and reaction mechanisms (Rodgers et al, 1985) have revealed that MDF consists of well packed anhydrous grains bonded together by a complicated hydrate/polymer. Nevertheless the proposition that normal HCP is obeying the Griffith criterion is of great interest; unfortunately the results presented by Birchall et al (1981) showed considerable scatter, thus it is difficult to assign a specific flexural strength-notch length relationship.…”

Section: Biv Strength Of Hcpmentioning

confidence: 99%

Crack Growth in Hardened Cement Paste

Baldie

Pratt

1985

MRS Proc.

View full text Add to dashboard Cite

This thesis describes the examination of the microstructure of hardened cement paste [HCP], in particular, cracking in HCP, and the measurement of subcritical crack growth in HCP.A scanning electron microscope has been used to examine, fracture surfaces, complementary fracture surfaces, polished surfaces, and polished surfaces containing introduced cracks. This examination has provided information about fracture paths in HCP, which shows that the main hydration products [C-S-H gel and calcium hydroxide] form the majority of crack path elements. The interpenetration of these products during hydration, and the expected variations in strength of these hydration products suggest that both must be recognised as significant contributors to the mechanical properties of HCP. The examination of cracks in polished surfaces appears to be a very useful way of determining the microstructural aspects of cracking, and its possible future applications are discussed.Two methods of determining the subcritical crack growth parameter [n] were performed, the first, load-relaxation in double torsion plates yielded a value of 64, while the second, the variation in the critical stress intensity of single edge notched beams with loading rate yielded a value of 27. The much higher value determined by load relaxation is thought to be due to both, the effect of crack resistant inhcmogeneities in the microstructure which have a more marked effect on load relaxation measurements, and a susceptibility to creep in the double torsion plates which reduced the amount of crack growth. The susceptibility to creep was identified by a shift of the crack velocity-stress intensity [V-K] curves to higher stress intensities with repeated loading. The value of subcritical crack growth parameter of 27, determined by the variation of critical stress intensity with loading rate, is therefore regarded as the more valid.

show abstract

“…Especially, very high flexural strengths, 20 or 30 times higher than conventional cement pastes, were easily obtained. The reasons for obtaining such high strengths and superior properties are very low water/cement ratio, crosslinking between polymer and cement, and the unique composition and production process [3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Effect of TiO2 Addition on the Properties of Macro Defect Free Cement-Polymer Composites

Ekincioglu

Özkul

Paţachia

et al. 2013

Restoration of Buildings and Monuments

View full text Add to dashboard Cite

Macro-defect free (MDF) cement is a cement-polymer composite with superior flexural strength although produced by mixing cement with small amounts of polymer and water. Special production technique and the crosslinking occurred between cement and polymer are important factors for obtaining such high strengths. However, MDFs lose considerable strength when exposed to water. The objective of this study was to explore the effects of TiO 2 addition on flexural strength and water sensitivity of MDF. In this study, MDF cements were produced by adding up to 4 % TiO 2 by weight of cement. Biaxial flexural test as well as Atomic Force Microscopy (AFM) and Fourier Transform Infrared Spectroscopy (FTIR) tests were conducted in order to investigate the effect of TiO 2 addition. TiO 2 addition improved the water resistance of MDF cements in some batches, especially with 2 % addition possibly due to the C PVA -O-Ti-O-C PVA bond and this cross-linking mechanism together with C PVA -O-Al-O-C PVA bonds cause a more stable polymer network.

show abstract

Reactions in the Setting of High Strength Cement Pastes

Cited by 11 publications

References 1 publication

XPS characterization of polymer–monocalcium aluminate interface

XPS characterization of polymer–monocalcium aluminate interface

Crack Growth in Hardened Cement Paste

Effect of TiO2 Addition on the Properties of Macro Defect Free Cement-Polymer Composites

Contact Info

Product

Resources

About