... cement paste critical strain cross-over strain deformation fly ash (PFA) mechanisms rheological rheological properties structural build-up viscoelastic region The rheological behaviour of cement-based materials plays a key role in many practical applications, such as self-compacting...

..._–SiO₂ (R–C–A–S) precursors were synthesised by calcination. AAC pastes were produced from the resulting precursor powders activated with a small amount of sodium silicate solution and the mechanisms were explored through comprehensive characterisation methods. The research revealed that precursors...

... the mechanisms of SF in relation to OLCP . Results show that incorporating SF enhances the homogeneity of OLCP significantly, refines pore structure and increases compressive strength. These improvements are primarily attributed to the pozzolanic, filling and nucleation effects of SF, which depend...

... by grinding clinkers with lime and gypsum. Preparation factors were investigated and multiple characterisation methods were adopted to explore the calcination and hydration mechanisms. The sodium hydroxide additive was found to reduce the activation temperature of the kaolin and a moderate addition of sodium...

... carbonation kinetics mechanisms recycling & reuse of materials sustainable development There is a growing acceptance among society and industry of the need to transform the take–make–dispose economy into a circular one (EC, 2020). According to this philosophy of circular economy, resources...

... the concrete's mechanical properties. Ilg and Plank (2019) used polyether amine and polyglycerol to generate a PCE with a hyperbranched structure. The huge steric hindrance of the PCE greatly enhanced water retention and provided a certain sulfate resistance, but the complexity of the synthesis process...

... formation temperature while prolonging the formation time. With an increase in the residual carbon content, the morphology of the resulting tobermorite changes from needle-like and plate-like to irregular, which may also have a detrimental effect on the mechanical properties of the material. SEM images...

... compressive strength mechanisms microstructure The above equations show that the hydration product of MOC depends on the ratio of raw materials, including the molar ratios of magnesium oxide/magnesium chloride (MgO/MgCl_{2) and water/magnesium chloride (H2O/MgCl2). When the molar}...

... was prepared. The hardening performance, the composition and microstructure of the reaction products and the hardening mechanism of this bonding material were evaluated. It was found that the compressive strength of the material reached 78·2 MPa after the carbon-dioxide-activated curing (CDAC) process...

...–fragmentation chain transfer polymerisation (RAFT), respectively. The relations between molecular structure and hydrodynamic radius, adsorption properties, flow behaviours and rheological properties were systematically investigated to illustrate sub-microscopic mechanisms. The results obtained could provide...

... as the main raw materials. In this work, the mechanical properties of MOCC (setting time and compressive and flexural strengths) were tested. The rules governing the phase composition and microstructure changes of the hydration products were analysed using X-ray diffraction and scanning electron microscopy...

... of new topological structures of PCEs in future studies. 22 05 2017 20 11 2017 22 11 2017 ICE Publishing: All rights reserved 2017 adsorption mechanisms superplasticisers Superplasticisers (also known as high-range water reducers) are important chemical admixtures...

..., mine shafts and other underground engineering activities (Li et al., 2011 ; Russo et al., 2015 ; Sheng and Wei, 2012). An accurate understanding of the deformation behaviour of frozen soil and its underlying mechanism is required to produce a reliable design and form a reasonable...

...Chaohua Jiang; Huiwen Yuan; Chunhua Lu; Zhongzi Xu; Duyou Lu Heated cementitious pastes could be used as thermal energy storage materials. The effects of nano-silica, nano-magnesia and nano-zirconia on the evolution of the mechanical and thermal properties of calcium aluminate cement (CAC) pastes...

... they affect the work performance, hydration-induced increases in temperature and mechanical performance of magnesium potassium phosphate cements (MKPCs). Analytical methods such as X-ray diffraction spectroscopy, eight-channel microcalorimetry and thermogravimetric-differential scanning calorimetry are used...

...Tsuyoshi Hirata; Paulo Branicio; Jun Ye; Jianwei Zheng; Yoshikazu Tomike; Alex Lange; Johann Plank; Michael Sullivan The working mechanism of polycarboxylate ether (PCE) type superplasticisers in concrete was studied from the point of view of conformational changes of the polymer simulated...

...-temperature condition of 200°C (bottom-hole circulating temperature). Cement slurry with FL exhibits good comprehensive performance under high-temperature and ultra-high-temperature conditions. The working mechanisms of the fluid loss reducer FL are studied and the compressible ‘viscoelastic adsorbed layer...

... admixtures mechanisms sulfate-related deterioration Comb-like superplasticisers (high-range water reducers) or polycarboxylate polymers (PCPs) are now commonly used in order to improve the workability of cementitious systems (Kirby and Lewis, 2004 ; Ramachandran et al., 1998...

...Liangliang Shui; Zhenping Sun; Haijing Yang; Xu Yang; Yanliang Ji; Qiong Luo In this paper, a brief overview of the current literature on the dispersion mechanism of polycarboxylate-type superplasticisers (PCEs) is first presented. Then, the available free water amount and fluidity of cement paste...