Preparation, properties and hydration process of low temperature nano-composite cement slurry

Wang, Sheng; Jian, Liming; Shu, Zhihong; Wang, Jingfei; Xu, Haiyang; Chen, Liyi

doi:10.1016/j.conbuildmat.2019.02.049

Cited by 22 publications

(5 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The XRD analysis results show that there was no AFm in the hydration product. Therefore, it can be concluded that the hydration product is AH 3 , corresponding to the endothermic valley at 290 °C, and the other endothermic valley corresponds to AFm [29,30], correlating to the lower measurements in the compressive strength and decreasing stress-strain trend between 100 °C and 300 °C. The endothermic peaks (DTG/TG curves) higher than 700 °C are due to the further dehydration of C-S-H and the decomposition of CaCO 3 inside the cement.…”

Section: Sem Analysis and Xrdmentioning

confidence: 90%

“…To measure the effect of the elevated temperatures on the SACC, the different samples were exposed to various temperatures for 4 hrs. [13,14]. The samples were removed from the standard curing room under humidity control for the cement concrete room temperature (T = = 23 ± 2 °C, RH > 95 % [15]) after 28 days; they were then air-dried for 5 days in the laboratory.…”

Section: Test Stand and Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Compressive Strength of Rapid Sulfoaluminate Cement Concrete Exposed to Elevated Temperatures

Tchekwagep¹

2020

Ceramics - Silikaty

View full text Add to dashboard Cite

The compressive strength, modulus and stress-strain behaviour of rapid-hardening sulfoaluminate cement concrete were evaluated as functions of the temperature increase. The compressive strength decreased from 51.3 to 31.1 MPa (around a 39 % reduction) as the temperature increased from 20 °C to 300 °C while the specimens burst at 400 °C before being removed from the furnace. A significant change in the stress-strain behaviour was noticed with an increasing temperature. For the control specimens (20 °C), linear elastic behaviour was followed by plastic deformation before reaching the peak stress prior to failure, but for higher temperatures, the modulus of elasticity was up to 85 % lower and was characterised by a gradually decreasing slope until failure. The micro-structural changes detected by SEM, DTG/TG and XRD were consistent with this pattern. The degree of cracking at the interfacial transition zone and crack-width growth detected by SEM followed a clear trend with the increasing temperature. The transformation of the primary hydration products (e.g., ettringite and Al(OH) 3) as detected by XRD and DTG/TG provides a useful explanation of the strength reduction with the increasing temperature up to 300 °C. The vapour pressure evolvement within the specimens at elevated temperatures correlates well with the reduced strength and modulus of elasticity, with a very intense effect at 400 °C.

show abstract

Section: Sem Analysis and Xrdmentioning

confidence: 90%

Section: Test Stand and Methodsmentioning

confidence: 99%

Compressive Strength of Rapid Sulfoaluminate Cement Concrete Exposed to Elevated Temperatures

Tchekwagep¹

2020

Ceramics - Silikaty

View full text Add to dashboard Cite

show abstract

“…The density of a cement slurry is greater than the formation fluid during cementing to avoid kick and blowout [10,21]. This density difference would cause a pressure differential at the borehole.…”

Section: Effect Of Alkaline Filtrate From Cement Slurry On Strengthen...mentioning

confidence: 99%

“…Under this condition, the cement sheath is similar to a boat floating in the weakly consolidated shallow formation, providing limited strength to support the long-term stable service of the wellbore. Many methods have been applied to address these cementing problems, such as improving the cement slurries [10][11][12][13][14][15], reinforcing the mud cake [16], enhancing the bonding strength of the cement-formation interface [17], and using self-healing cement technology [18,19]. However, the cement-formation interface and mud cake are too thin to prevent the failure of the brittle cement sheath.…”

Section: Introductionmentioning

confidence: 99%

An Experimental Study on the Reinforcement of Weakly-Consolidated Shallow Formation in Deep Water Using an Epoxy Resin-Based Fluid

Tian¹,

Bu²,

Liu³

et al. 2023

Fluid Dynamics &Amp; Materials Processing

View full text Add to dashboard Cite

The mechanical properties of Portland cement differ from the weakly consolidated shallow formation in deep water. This results in undesired abrupt changes in the compressive strength and elastic modulus at the cement-formation interface. In this study, a water-borne epoxy resin was applied as a strengthening material to reinforce the weakly consolidated shallow formation and protect the cement sheath from potential failure. The mechanical properties of the unconsolidated clay were tested, including their changes with increases in the temperature and curing time. In addition, the effects of the seawater, cement slurry alkaline filtrate, and saltwater drilling fluid were evaluated. As confirmed by the results, the strengthening fluid was excellent at reinforcing the unconsolidated clay, with a compressive strength of 2.49 MPa (after curing for 7 days), even at a dosage of 5%. A cement slurry filtrate with a high pH was suitable to produce the required strengthening of the formation, especially its early age strength. It should also be pointed out that the used fluid exhibited good compatibility with the saltwater drilling fluid and seawater behaved well as a diluent for the strengthening fluid.

show abstract

“…Recently, the modification of cementitious materials with ultrafine materials has received increasing attention from researchers. Several ultrafine materials, such as nano-CaCO 3, , nano-ZnO, nano-TiO 2 , , , nano-Fe 2 O 3 , nano-SiO 2 , , , nano-Al 2 O 3 , , , ultrafine LiAl-LDH, , carbon nanofiber and graphene, , and ultrafine ettringite, have been investigated to increase the exothermic rate of hydration and enhance the mechanical properties of sulfoaluminate cement. However, ultrafine materials possess a propensity for agglomeration owing to their small particle size and high surface energy, thereby diminishing the effectiveness of nanomaterials. , …”

Section: Introductionmentioning

confidence: 99%

Effect of AH₃-PCE Ultrafine Composites on the Properties of Sulfoaluminate Cement-Based Materials

Li,

Hu,

et al. 2023

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

The use of superfine particles has been found to be a promising method for accelerating cement hydration. Amorphous aluminum hydroxide (AH3) is a key hydration product in sulfoaluminate cements and our preliminary research work indicated that the ultrafine amorphous AH3 accelerates the hydration rate of sulfoaluminate cement-based grouting materials (SAGMs). However, the ultrafine AH3 tends to agglomerate easily, which affects its effectiveness. In this study, aluminum hydroxide-polycarboxylic acid superplasticizer (AH3-PCE) ultrafine composites were prepared using the sol–gel method, and their effect on the hydration and hardening process of SAGMs was investigated. The results showed that the particle size of the AH3-PCE ultrafine composites decreased and then increased with increasing amount of PCE and there was a strong interaction of AH3 with PCE through the oxygen atoms of C–O–C. AH3-PCE ultrafine composites provided nucleation for the growth of bayerite and ettringite (AFt). Moreover, the AH3-PCE ultrafine composites released aluminum ions and PCE in an alkaline solution at pH 12.5. The AH3-PCE ultrafine composites promoted cement hydration, adjusted the pore structure of the hardened paste, and improved the compressive strength at all ages owing to the synergistic effect of nucleation, aluminum ions, and PCE released from the AH3-PCE ultrafine composite.

show abstract

Preparation, properties and hydration process of low temperature nano-composite cement slurry

Cited by 22 publications

References 22 publications

Compressive Strength of Rapid Sulfoaluminate Cement Concrete Exposed to Elevated Temperatures

Compressive Strength of Rapid Sulfoaluminate Cement Concrete Exposed to Elevated Temperatures

An Experimental Study on the Reinforcement of Weakly-Consolidated Shallow Formation in Deep Water Using an Epoxy Resin-Based Fluid

Effect of AH₃-PCE Ultrafine Composites on the Properties of Sulfoaluminate Cement-Based Materials

Contact Info

Product

Resources

About

Preparation, properties and hydration process of low temperature nano-composite cement slurry

Cited by 22 publications

References 22 publications

Compressive Strength of Rapid Sulfoaluminate Cement Concrete Exposed to Elevated Temperatures

Compressive Strength of Rapid Sulfoaluminate Cement Concrete Exposed to Elevated Temperatures

An Experimental Study on the Reinforcement of Weakly-Consolidated Shallow Formation in Deep Water Using an Epoxy Resin-Based Fluid

Effect of AH3-PCE Ultrafine Composites on the Properties of Sulfoaluminate Cement-Based Materials

Contact Info

Product

Resources

About

Effect of AH₃-PCE Ultrafine Composites on the Properties of Sulfoaluminate Cement-Based Materials