High alumina cement-phenol resin composite: Water resistivity and effect of post hydration of unreacted cement on durability

Pushpalal, Dinil; Kobayashi, Tadashi; Hasegawa, Masaki

doi:10.1016/s0008-8846(97)00130-0

Cited by 20 publications

(4 citation statements)

References 5 publications

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“…Yang et al [15] showed that the compressive strength of concrete with a water/binder ratio of 0.28 after rehydration at 80 • C for 7 days was 16.1% lower than that before rehydration. Elsewhere, research by Pushpalal et al [16] found that the compressive strength of high alumina cement/phenolic resin composites with minimal hydration decreased by 9% after being placed in an outdoor environment for one year, which they ascribed to the rehydration of unhydrated cement.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Rehydration on the Properties of Portland Cement-Based Materials with Low Water/Binder Ratios: A Review of Existing Research

Wang

Liu

et al. 2023

Materials

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Cement-based materials with a low water/binder ratio contain a high number of unhydrated cement particles, which implies that a rehydration reaction occurs when they encounter water again. This study aimed to explore how rehydration influences the macroscopic and microscopic properties of cement-based materials. The key study findings included that rehydration could still occur in cement-based materials after one year of hydration, and that the capacity for rehydration-induced repair or damage to cement-based materials depended on whether their internal pores could accommodate rehydration products. During rehydration, the compressive strength and porosity of the specimens were found to first increase and then decrease. The capillary water absorption coefficient decreased continuously over a rehydration period of 120 days. As the water/binder ratio rose, the rehydration rate first increased and then decreased. First, the influence of temperature on the rehydration rate was more noticeable when the water/binder ratio was below 0.3; second, whereas adding large amounts of fly ash and silica fume did not prove to be conducive to repairing and enhancing cement-based materials undergoing rehydration, adding slag and small quantities of silica fume, or alternatively compounding small amounts of silica fume and fly ash could improve the repair and enhancement effects of rehydration.

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Section: Introductionmentioning

confidence: 99%

The Influence of Rehydration on the Properties of Portland Cement-Based Materials with Low Water/Binder Ratios: A Review of Existing Research

Wang

Liu

et al. 2023

Materials

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“…G.K.D. Pushpalal and T. Kobayashi showed that the late hydration of unhydrated particles has a negative effect on the linear expansion rate, elastic modulus and mass change rate of cement-based materials [8].…”

Section: Introductionmentioning

confidence: 99%

Effect of Rehydration of Unhydrated Cement on Ultra-High Performance Concrete After Heat Curing

Xiong¹

2021

Ceramics - Silikaty

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Mechanical performance testing, X-ray diffraction (XRD), scanning electron microscopy (SEM) and mercury intrusion porosimetry (MIP) were used to study the effect of rehydration of unhydrated cement on ultra-high performance concrete (UHPC) under contact moisture and to isolate the moisture environments after different curing temperatures. The results indicated that the unhydrated cement particles can continuously hydrate when in contact with moisture and reduce the porosity, especially the 10 ~ 100 nm pores, and continuously improve the late strength of UHPC at 20 ℃ and 90 ℃ under a contact moisture environment. Contact with moisture will significantly increase the porosity and the 10 ~ 100 nm pores of the specimen, thereby leading to severe strength shrinkage and causing moisture susceptibility problems to the UHPC, while the isolated moisture also causes a slight reduction in the strength after curing at 250 ℃. Contact with moisture can cause more severe strength shrinkage when the curing temperature is 250 ℃.

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“…Calcium aluminate cement (CAC) is usually preferred over Ordinary Portland Cement (OPC) because higher flexural strength levels are obtained with this type of cement. PVA copolymers [2,8] poly(acrylamide) [9][10], cellulosic products [11][12][13][14] and alcohol soluble polymers such as phenol resin precursors are usually preferred as polymer [15][16][17][18]. Combinations of (CAC) and Poly(vinyl alcohol-co-vinyl acetate) PVA copolymers provide the highest strength, and have therefore been studied the most [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

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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.

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High alumina cement-phenol resin composite: Water resistivity and effect of post hydration of unreacted cement on durability

Cited by 20 publications

References 5 publications

The Influence of Rehydration on the Properties of Portland Cement-Based Materials with Low Water/Binder Ratios: A Review of Existing Research

The Influence of Rehydration on the Properties of Portland Cement-Based Materials with Low Water/Binder Ratios: A Review of Existing Research

Effect of Rehydration of Unhydrated Cement on Ultra-High Performance Concrete After Heat Curing

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

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