Zhonghe Shui

Zhonghe Shui
Wuhan University of Technology | WHUT · State Kay Lab of Silicate Materials for Architectures

PhD

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74
Publications
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3,679
Citations

Publications

Publications (74)
Article
Metakaol in which is produced by calcined kaolin may easily occur aggregation because of its high surface energy, which would have a bad effect on its performance. At the same time, the loose accumulation increases the cost of its storage and transportation. In this study, water-based metakaolin slurry was prepared by introducing polyvinyl alcohol...
Article
The high-temperature behavior and rehydration characteristics of the hardened cement paste and their mechanisms have been studied in this paper. X-ray diffraction and thermogravimetry are used to establish the effect of elevated temperatures on the mineralogical changes that occurred in the hardened cement paste. The change of microstructure was ch...
Article
This paper addresses the efficiently reuse of the recycled construction waste cementitious materials (RCWCM). The RCWCM is firstly collected, and then subjected to crushing, grinding and thermal treatments, respectively. After that, the obtained powder material is named dehydrated cement paste (DCP) in this study. Due to the fact that the DCP has r...
Article
We experimentally studied the interaction between pozzolanic material (fly ash) and dehydrated autoclaved aerated concrete (DAAC). The DAAC powder was obtained by grinding aerated concrete waste to particles finer than 75μm and was then heated to temperatures up to 900 °C. New cementitious material was prepared by proportioning fly ash and DAAC, na...
Conference Paper
The designed service life of Hong Kong-Zhuhai-Macao Bridge is 120 years. Concrete quality control for the submerged tunnel of the project is an important work to assure the designed service life. This article is to present an advanced concrete performance prediction method based on water-binder ratio (w/b) monitoring, which is used to serve for con...
Article
In this paper, the effects of metakaolin addition on the compressive strength and chloride penetrability were studied. The study focused on the diffusion of the free and total chloride in concrete containing metakaolin (MK), which was measured by a potentiometric titration measurement. Effect of MK and sulphate on chloride binding capability was in...
Article
The increasing importance of the ecologically minded production of building materials makes it necessary to develop reasonable alternatives to the CO2-intense production of ordinary Portland cement (OPC). The development of new or modified concrete is an important part of existing strategies to improve performance and minimize life-cycle costs. The...
Article
Supersulphated phosphogysum-slag cement (SSC) is a newly developed non-burned cementitious material mainly composed of phosphogysum (PG) and ground granulated blast furnace slag (GGBFS), with small amount of steel slag (SS) and clinker (CL). SSC is a kind of environmentally-friendly cementitious material due to its energy-saving, low-carbon emissio...
Article
The influences of admixtures metakaolin (MK), silica fume (SF), sulphur aluminate cement (SAC) and sodium silicate (SS) on the early performance, such as the rate of setting, early strength and so on of persulphated phosphogypsum-slag cement (PPSC) were researched. And through XRD, SEM, we studied the hydration process and structure development of...
Conference Paper
How far the concrete can be used as finishing material depends on how smooth and functional it can be. In this work an ultra smooth surfaced photocatalytic concrete is fabricated with a method taking use of the nano granular nature of the main hydration product of cement Calcium Silicate Hydrate (C-S-H) and the photocatalysis of nano TiO 2 . Th...
Article
This paper presents a study, including experimental and mechanism analysis, on investigating the effect of agglomeration of a recycled cement additive on the hydration and microstructure development of cement based materials. The recycled additive is firstly produced form waste hardened cement paste subjected to high temperature environment, namely...
Article
In this work, pore structure and carbonation resistance properties of sulphoaluminate cement (SAC) concrete incorporating magnesium aluminate-based layered double hydroxides (LDHs) were analyzed. Mercury intrusion porosimetry (MIP) was employed to characterize the effects of LDHs on the pore structure. Other techniques such as X-ray diffraction (XR...
Article
Microstructure development of hydrating cement paste at early ages is not only an indicator of the reactivity of cement, but also a factor on the workability of fresh concrete. In this study, the microstructure development of hydrating cement paste at early ages is investigated with non-destructive methods including ultrasound P-wave propagation ve...
Article
The pore structure and interfacial transition zone (ITZ) of concrete incorporating slag, silica fume and metakaolin were analyzed in this study. Some techniques such as mercury intrusion porosimetry (MIP), microhardness testing and scanning electronic microscopy (SEM) were employed to characterize the effects of slag, silica fume and metakaolin on...
Article
Calcium Silicate Hydrates (C–S–H) is the main products of cement hydration, influence of different organic component (organic macromolecular or polymers) on composition and structure of calcium silicate hydrate has important implications. Pore structure parameters of pure C–S–H with specific surface area of 43.67 m2/g and average diameter of 9.75 n...
Article
This paper presents an experimental study, including evaluation and modification, on using dehydrated cement paste (DCP) as a new type of cement additive. After a series of processes, normal DCP (N-DCP) was produced as before and a modified form of DCP (M-DCP) was produced as well. The cementitious characteristics of the groups with different kinds...
Article
Full-text available
Recycling of industrial wastes and by-products can help reduce the cost of waste treatment prior to disposal and eventually preserve natural resources and energy. In this work, the pore structure and interfacial transition zone (ITZ) of concrete incorporating ground granulated blast furnace slag (GGBS) and metakaolin (MK) were analyzed. Some techni...
Conference Paper
The price of metakaolin is one of the constraining factors to large-scale applications in concrete. In this paper, 6 grade kaolins have been applied in the experiment to seek one that has high performance-cost ratio. All grade kaolins were treated by the same calcination system that heated treating of 750¢C for 4 hours to produce metakaolin. Techni...
Article
In this study, the pore structure of concrete incorporating metakaolin (MK) was characterized when exposed to two types of curing conditions, seawater and fresh water, respectively. The traditional properties such as compressive strength and carbonation resistance of concrete were experimentally evaluated in relation to their pore characteristics....
Article
Cement-based materials are known to be time-dependent, especially at early ages. The time-dependent flow-behavior change controls the workability and compactability of fresh concrete. This time-dependent nature of cement-based materials is associated with the cement hydration and the consequent microstructure development. Time-dependent rheological...
Article
Non-destructive methods such as ultrasonic wave, impact echo, and ground penetrating radar were used to study the internal structure of early-age concrete. The results indicate that the ultrasonic, stress, and electromagnetic wave velocity can reflect well the variation of the internal structure in concrete. With the influence of cement hydration,...
Article
The chloride binding capacity of concrete can affect the rate of chloride ingress, which ultimately determines the chloride-ion resistance. A layered double hydroxide (LDH) can absorb the chloride ions in cement paste and delay chloride ingress in the structure. A method for evaluating the chloride binding capacity of cement paste was used in the e...
Article
In this paper, we investigate the development of stress and the debonding behavior of thin bonded concrete overlays under restrained conditions. The results show us that the fractured mode of a concrete repair system will change clearly along the new concrete with higher shrinkage deformation to crack along the interfacial layer, and with increasin...
Article
The adsorption of superplasticizers in fly ash blended cement paste and its rheological effects were investigated. It is shown that the absorption of superplasticizer on portland cement particles is very different from that on fly ash particles. The fly ash particles have smooth surfaces and are negatively charged, so its adsorption capacity is wea...
Article
One of high efficient ways to reuse the recycled construction and demolition waste (CDW) is to consider it as a road base material. The recycled CDW however is mainly a mix of recycled masonry and concrete with a wide variation in composition. This results that the mechanical properties of cement treated demolition waste are not only determined by...
Article
Full-text available
A grand canonical Monte Carlo simulation method was used to analyze the adsorption characteristic of water in kaolin. To understand the adsorption mechanisms, the numerical analysis and the corresponding experiments at different temperatures and pressures with the exchange of various cations were carried out. The results show that the experimental...
Article
Subjected to the wet surrounding, hydrated cement paste (HCP) exposed to high temperature may exhibit rehydration behavior. This paper presents the influence of the dehydration temperature and the initial water/cement ratio on the rehydration activity of dehydrated cement paste (DCP). Original HCPs were prepared with two water/cement ratios of 0.3...
Article
Hydrating cement paste (HCP) may be considered as a kind of porous material. The changes of its pore system and internal moisture state with cement hydration certainly influence its thermal expansion response. This study investigated the influence of hydration time on the coefficient of thermal expansion (CTE) of HCP. Specimens (inner diameter 8 mm...
Article
Full-text available
Due to environmental reasons and the shortage of natural resources, it is greatly valuable to recycle construction and demolition waste (CDW) as much as possible. One of effective ways to reuse more CDW is to produce a cemented road base material. The recycled CDW however is a mix of recycled masonry and concrete with a wide variation in compositio...
Article
The activation of industrial by-products is an efficient way to produce binders for concrete in place of portland cement. This paper presents an experimental study on a new cementitious material using fly ash and dehydrated cement paste (DCP). A low-calcium fly ash was activated with DCP that was obtained by heating hardened cement paste at 1202°F...
Conference Paper
Full-text available
Cement treated granular materials have been applied for pavement bases and subbases. The availability of prediction models that allow their mechanical properties to be estimated from material parameters like composition and degree of compaction would be extremely useful because it would overcome the need for extensive testing. This paper presents a...
Article
In this paper, we study the structure characteristic of calcium silicate hydrate (C-S-H) gels by using molecular dynamic simulation. We mainly focus on two types of calcium silicate hydrate (C-S-H) gels, namely, C-S-H(I) and C-S-H(II). Our simulations indicate that, in accordance with experiments, two types of C-S-H gels both present the structural...
Chapter
The interactions between organic molecules and calcium silicate hydrate were studied using molecular simulation techniques. Representative model of calcium silicate hydrate-Hamid model was selected as the initial structure of this simulation. Method of molecular mechanics (MM) and molecular dynamics (MD) were employed for simulation and calculation...
Article
Modification of structure and thermodynamic properties of montmorillonite is studied by molecular dynamics simulation. The simulation results show that the pure montmorillonite system is unstable in nature, while the structure of doping-modified montmorillonite is more stable. In simulation process, the activity between the molecule and impurity io...
Article
The dominant factors during early hydration process of cement paste containing 10% metakaolin replacement (MK10) and 10% kaolin replacement (K10) are investigated in comparison to neat cement paste (NCP), and X-ray Diffraction (XRD) analysis is employed to identify the crystalline phases of all specimens. Thermogravimetric (TG) and Differential Sca...
Article
Concrete is a heterogeneous composite material with multiple components that have different thermal expansion properties. Internal stresses are generated if the concrete is rapidly heated or cooled, causing cracking in the micro- or macro-scale. If the coefficient of thermal expansion (CTE) of hardened cement pastes (HCP) is adapted, the thermal st...
Article
To enhance the performance of mix granulate road base courses by cement treatment. The mechanical properties of cement treated mix granulate (CTMG) were studied, which was designed with 65% crushed masonry and 35% crushed concrete by mass. The central composite design was employed to prepare specimens with different levels of cement content and deg...
Article
Early age hydration of cement paste was investigated by monitoring the ultrasonic propagation velocity and simulated with the numerical model CEMHYD3D. The ultrasonic velocity of the P-wave was recorded during the first 24 hours of the hydration process and its evolution was analyzed. It is shown that the UPV method is an effective, accurate and no...
Article
To study the relationship between material composition, curing conditions and strength development, the study simulated high-strength precast concrete pile production, and a high-strength mortar up to 90 MPa was designed and a hot-water pool was built for concrete curing. The major point of the study was to achieve a high early strength by using ce...
Article
The interfacial transition zone (ITZ) as the weakest position in concrete is always paid much attention. This paper presents the results of an investigation on the interfacial bond between aggregate and matrix in the near surface layer of concrete at the macro- and micro-level. Specimens with different silica fume additions (0%, 6%, 9% and 12% by m...
Article
There is a big difference in cementations characteristics between ordinary Portland cement and activated cement paste, which is made from hydrated cement paste subjected to high temperatures. In order to change its cementations characteristics, this paper uses a certain amount of fly and gypsum as a kind of modifying addition to modify the activate...
Article
This paper emphasizes on studying the cementitious characteristics and the relative rehydration capability of dehydrated cement paste (DCP). Several specimens of DCP were firstly prepared, respectively after pre-heating the powders of hydrated cement paste (HCP) at different temperatures ranging from 300°C to 900°C. The cementitious properties of e...
Article
This paper presents the results of thermal expansion measurements of mortar and limestone aggregate and thermal induced mesocracks around limestone aggregate in normal concrete exposed to high temperature, up to 800°C. The former was measured by a fused silica Workhorse Dilatometer. The later was observed by the viewfinder of Polarizing Optical Mic...
Article
A computed-based model for the alkali concentrations in pore solution of hydrating Portland cement paste is proposed. Experimental data reported in different literatures with thirteen different recipes are analyzed.A3-Dcomputer-basedcementhydrationmodelCEMHYD3Disusedtosimulatethehydrationofthese pastes.The models predictions are used as inputs for...
Article
It is desirable to completely recycle concrete waste in order to protect the natural resources and reduce the environment pollution. The coarse recycled concrete aggregates (CRCA) from crushed concrete waste have been successfully applied in new concrete and road base. However, the use of fine recycled concrete aggregates (FRCA) is generally limite...
Article
A method was proposed for predicting the reactivity of slag in cement considering its oxide composition and the alkalinity of the environment and a three-dimensional computer model for simulating the hydration and microstructure development was also presented based on a 3-D computer model for Portland cement hydration (CEMHYD3D). The 3-D microstruc...
Article
The slice-weighing method was used to investigate the unsaturated water transport of different cement pastes. The experimental results show that a sharp wetting front existed during water transport, the transport can be described by a non-linear diffusion equation, and transport coefficient of different materials exhibit various rules with water co...
Article
A newly developed version of a three-dimensional computer model for simulating the hydration and microstructure development of slag cement pastes is presented in this study. It is based on a 3-D computer model for Portland cement hydration (CEMHYD3D) which was originally developed at NIST, taken over in the authors’ group and further developed. Fea...
Article
The rehydration characteristics of hydrated cement paste (HCP) (w/c=0.5) subjected to high temperatures were evaluated by the water requirements of standard consistency, the setting times, the compressive strength, rehydration degree and mineral analysis by XRD. The results showed that with the increase of heating temperature, the water requirement...
Article
The thermal deformation behavior of hardened cement paste and coarse aggregate were conducted by the Workhorse-1 dilatometer made in Anter Corporation (USA). The results showed that thermal expansion coefficient of hardened cement paste was over two times than that of coarse aggregate with great diversity. After more thermal cycles, the micro-crack...
Article
By using the uptodate temperatuer-stress testing machine, the thermal expansion coefficient of concrete at early ages was studied and indicative conclusions were achieved: temperature rising due to hydration heat is not directly correlated with cracking, but the temperature and stress evolution process should be taken into consideration in the same...
Article
By means of reducing the ratio of water to cement (w/c), incorporating a proper amount of fly ash and superplasticizer, and processing the surface of recycled aggregate (RA), this paper aims at improving the interfacial transition zone (ITZ) submicro-structure of the regenerated concrete (RC). The experimental results of mercury intrusion pressure...
Article
The stress-resistance relationship of carbon fiber cement was studied. Attention has been paid to explore the improvement of the stress-resistance sensitivity under cycled stress restriction. The prismy carbon fiber cement sensors were pre-fabricated. The factors such as contents of carbon fibers, silica fume, dispersant and the w/c were taken into...
Article
Carbon black, graphite and carbon fibre were employed to design and prepare electrically conductive asphalt mixtures containing single filler or mixed fillers of conductive powder plus carbon fibre. The effects of filler type, filler content and mixed fillers on the resistivity of asphalt concrete were investigated. Experimental results showed that...
Article
In this paper, the effects of elevated temperatures on the compressive strength stress–strain relationship (stiffness) and energy absorption capacities (toughness) of concretes are presented. High-performance concretes (HPCs) were prepared in three series, with different cementitious material constitutions using plain ordinary Portland cement (PC),...
Article
Concrete specimens were prepared with a recycled normal-strength concrete (NC) aggregate, a recycled high performance concrete (HPC) aggregate and a natural aggregate (NA) as control. The influence of these aggregates (recycled and natural) on the microstructure and compressive strength of the new concrete were studied. SEM observations revealed th...
Article
The influence of moisture states of natural and recycled aggregates on the properties of fresh and hardened concretes was investigated. Concrete mixes were prepared with natural and recycled aggregates at different proportions. The moisture states of the aggregates were controlled at air-dried (AD), oven-dried (OD) and saturated surface-dried (SSD)...
Article
This paper presents an investigation into the geometric characteristics of different ground granulated blast furnace slag (GGBS), including particle size distribution (PSD), shape and their influences on cement properties. Samples of GGBS with different PSDs are prepared using in three processing approaches, a ball mill, an airflow mill and a vibro...
Article
Asphalt and its composites are electrical insulating materials, whose resitivity ranges from 108∼1013Ω. The conductive performance of the asphalt-based composite can be markedly improved with the addition of conductive materials such as graphite. The electrically modified asphalt composites exhibit self-sensing ability to strain, defects, and tempe...
Article
Interfacial Transition Zones (ITZ) between cement matrix and inclusions such as aggregates were studied by scanning electron microscope (SEM), electron probe X-ray micro-analyzer (EPXM) and the energy dispersive X-ray analyzer (EDXA). Particular attention was paid to the distributions of the chemical elements in the vicinity of the ITZ. The test re...
Article
Materials such as Koch AH—70, basalt aggregate, limestone powder and graphite particles were used to prepare conductive asphalt concrete, which is a new type of multifunctional concrete. The mix proportion by weight was shown as follows. Fine aggregates (2.36–4.75 mm): fine aggregates (<2.36mm): lime-stone powder: asphalt=120∶240∶14∶30. The content...
Article
The microstructure of ITZ (Interfacial Transition Zone) in single glass fibre-cement was investigated by SEM (Scanning Electron Microscope), EPXM (Electron Probe X-ray Microanalyzer) and ESEM (Environmental Scanning Electron Microscope). The surface morphology of glass fibres and the hydration products in the vicinity of the interfaces were observe...
Article
A novel kind of self-healing materials, which is named catalytic crystalline waterproof coatings (CCWC) can permeate into pores and cracks of concrete and catalyze reaction to increase the impermeability of concrete. This paper reported the results of a study conducted to evaluate steel reinforcement corrosion of concrete specimens uncoated and coa...

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