...Tu-Nam Nguyen; Elsa Qoku; Burak Uzal; Angus P. Wilkinson; Kimberly E. Kurtis Calcium sulfoaluminate belite cements have found widespread use in specialised applications but have not been applied broadly due to rapid setting times. Conventional set retarders such as citric and tartaric acids modify...

...Hui Liu; Yunhao Ji; Chao Yuan; Jiaxin Liao; Suping Cui; Xiangming Kong In this study, the retardation mechanism of polycarboxylate ( PCE ) superplasticisers on cement hydration from the viewpoint of the dissolution–precipitation process was investigated. Effects of PCE superplasticisers...

... heat of hydration of MKPCs pose challenges in bulk production. To address this problem, the use of zinc oxide as a novel retarder for MKPC synthesis was investigated. Compared with conventional retarders like boric acid, zinc oxide was found to delay the initial hydration of MKPCs significantly...

...-lightweight cement pastes (such as foamed cements) are appropriate for formation damage prevention in fractured and depleted reservoirs. In this work, foamed cements were prepared at high shear rates using a foaming agent primarily composed of sodium lauryl ether sulfate, boric acid and a retarder (JR120...

... decreased by 10.37%, whereas the PSPs were less affected, with the saturated adsorption of SMD-1 only decreasing by 2.32%. Isothermal calorimetry measurements showed that the PSPs showed excellent retarding ability and could delay the hydration process of cement. Superplasticisers have become...

... permeation chromatography. Their dispersion ability, adsorption behaviour and retardation effect on cement hydration were investigated. It was proved that the star-shaped small-molecule phosphate compounds with longer polyether chains and more phosphate groups could be successfully applied as anti-clay SPs...

... and provide physical support during package placement. The ambient temperature and pressure will be 80–130°C and 30–50 MPa, respectively, depending on depth and local geological conditions. This will accelerate grout thickening, so retardation is required to facilitate slurry placement. Certain inorganic...

... to investigate the underlying mechanisms of these changes. Incorporation of a single retarder (NB) results in short MKPC hardening times and low early strengths. Admixture with 1·5% or more NB and CN effectively lengthens the hardening time of MKPC, but greatly decreases its fluidity. Incorporation of NB, CN...

...Dongdong Han; Weideng Chen; Shiyun Zhong The physical retardation effects of styrene/butyl acrylate copolymer latex on the early hydration of cement were investigated, with emphasis of the deformation of polymer particles adsorbed on cement. Five latexes with different glass transition temperatures...

... will support them during placement and seal against ingress of groundwater. The elevated temperature and pressure (∼120°C and 50 MPa) will cause acceleration of grout thickening and setting, so retardation is required. The DBD Research Group at The University of Sheffield has developed grouts based on class G...