Search results for: D. Snoeck

Items from 1 to 12 out of 12 results

article

Applying a biodeposition layer to increase the bond of a repair mortar on a mortar substrate

D. Snoeck, J. Wang, D.P. Bentz, N. De Belie

Cement and Concrete Composites > 2018 > 86 > C > 30-39

One of the major concerns in infrastructure repair is a sufficient bond between the substrate and the repair material, especially for the long-term performance and durability of the repaired structure. In this study, the bond of the repair material on the mortar substrate is promoted via the biodeposition of a calcium carbonate layer by a ureolytic bacterium. X-ray diffraction and scanning electron...

article

Do the impact of organic residues on soil quality extend beyond the deposition area under oil palm?

M.P. Carron, Q. Auriac, D. Snoeck, C. Villenave, more

European Journal of Soil Biology > 2016 > 75 > C > 54-61

Recycling empty fruit bunches (EFBs) in mature oil palm stands usually consists in distributing them over a limited area representing 3%–10% of the plot. The impact of this practice on soil quality, including soil biodiversity, is not well known at the plot scale. We analysed soil physical, chemical, and biological variables. Five zones were defined around the palm tree to assess spatial heterogeneity...

article

X-ray computed microtomography to study autogenous healing of cementitious materials promoted by superabsorbent polymers

D. Snoeck, J. Dewanckele, V. Cnudde, N. De Belie

Cement and Concrete Composites > 2016 > 65 > Complete > 83-93

Autogenous healing of cracks may offer a solution for brittle cementitious materials. In this study, the healing building blocks are available through the well-designed ultra-ductile microfibre-reinforced mixture with a low water-to-binder ratio and water is available through the inclusion of superabsorbent polymers. As visual inspection demonstrates that the crack is completely closed at the surface,...

article

Encapsulated Phase-Change Materials as additives in cementitious materials to promote thermal comfort in concrete constructions

D. Snoeck, B. Priem, P. Dubruel, N. De Belie

Materials and Structures > 2016 > 49 > 1-2 > 225-239

Energy efficiency in buildings has been a hot topic in recent years and the demand for alternatives regarding heat storage and thermal insulation is high. Materials with a large thermal mass like concrete can be optimized in terms of heat capacity. Useful for this purpose are Phase-Change Materials (PCMs), which show a high heat of fusion with a melting point within the ambient temperature range....

article

The effects of superabsorbent polymers on the microstructure of cementitious materials studied by means of sorption experiments

D. Snoeck, L.F. Velasco, A. Mignon, S. Van Vlierberghe, more

Cement and Concrete Research > 2015 > 77 > C > 26-35

Superabsorbent polymers (SAPs) are a promising additive to be used in the building industry but may induce microstructural changes. Water vapour sorption may be used to characterize the change in pore structure of cementitious materials, but the technique is difficult to interpret. In the present paper, static and dynamic vapour sorption (DVS) measurements were performed and compared to nitrogen adsorption...

article

From straw in bricks to modern use of microfibers in cementitious composites for improved autogenous healing – A review

D. Snoeck, N. De Belie

Construction and Building Materials > 2015 > 95 > Complete > 774-787

Cracks in concrete are inevitable and for durability reasons, the cracks should be repaired. Concrete has the intrinsic property to heal itself. But, the passive form of autogenous healing plays only an inferior role for a complete repair of a cementitious material. The main cause is that only cracks of limited width may heal completely. For that reason, microfibers are added to the mixture, as they...

article

The influence of superabsorbent polymers on the autogenous shrinkage properties of cement pastes with supplementary cementitious materials

D. Snoeck, O.M. Jensen, N. De Belie

Cement and Concrete Research > 2015 > 74 > Complete > 59-67

Fly ash and blast-furnace slag containing binders are frequently used in the construction industry and it is important to know the extent of autogenous shrinkage and its (ideal) mitigation by superabsorbent polymers in these systems as a function of their age. In this paper, the autogenous shrinkage was determined by manual and automated shrinkage measurements. Autogenous shrinkage was reduced in...

article

Spatial heterogeneity of soil quality around mature oil palms receiving mineral fertilization

M.P. Carron, Q. Auriac, D. Snoeck, C. Villenave, more

European Journal of Soil Biology > 2015 > 66 > Complete > 24-31

The African oil palm (Elaeis guineensis Jacq.) is grown on a total area of 16 million ha; but data on soil quality in mature oil palm plantations are fragmentary and data concerning biota are almost non-existent. Consequently, no well-tested sampling method is available for soil diagnoses. We studied the spatial heterogeneity of the soil around the palm by measuring comprehensive soil quality in a...

article

Effect of high amounts of superabsorbent polymers and additional water on the workability, microstructure and strength of mortars with a water-to-cement ratio of 0.50

D. Snoeck, D. Schaubroeck, P. Dubruel, N. De Belie

Construction and Building Materials > 2014 > 72 > Complete > 148-157

Superabsorbent polymers (SAPs) are particles which can take up a significant amount of fluid. In this paper workability, microstructure and strength properties were compared for mixtures with(out) SAPs and with(out) additional water. SAP particles reduce the flow, cause a densification of the matrix due to internal curing and also reduce the strength due to macro-pore formation. These characteristics...

article

Application of hydrogel encapsulated carbonate precipitating bacteria for approaching a realistic self-healing in concrete

J.Y. Wang, D. Snoeck, S. Van Vlierberghe, W. Verstraete, more

Construction and Building Materials > 2014 > 68 > C > 110-119

Bacterial-based self-healing is a promising solution for sustainable concrete maintenance. In this study, bacterial spores were first encapsulated into hydrogels and then were incorporated into specimens to investigate their healing efficiency. The precipitation of CaCO₃ by hydrogel-encapsulated spores was demonstrated by Thermogravimetric analysis (TGA). The mortar specimens with hydrogel-encapsulated...

article

The influence of different drying techniques on the water sorption properties of cement-based materials

D. Snoeck, L.F. Velasco, A. Mignon, S. Van Vlierberghe, more

Cement and Concrete Research > 2014 > 64 > Complete > 54-62

Dynamic water vapor sorption (DVS) may be used to characterize the pore structure of cementitious materials, but the technique is difficult to interpret as the microstructure is very sensitive to drying and rehydration due to humidity exposure. The removal of interlayer water or chemically bound water can cause microstructural shrinkage. As all drying techniques more or less dehydrate C–S–H and ettringite,...

article

Visualization of water penetration in cementitious materials with superabsorbent polymers by means of neutron radiography

D. Snoeck, S. Steuperaert, K. Van Tittelboom, P. Dubruel, more

Cement and Concrete Research > 2012 > 42 > 8 > 1113-1121

Concrete cracks due to its low tensile strength. As both harmful gases and fluids may enter the concrete by migrating into cracks, the durability is endangered. The service life decreases, repair costs rise and buildings could structurally decline. In the current research, crack sealing is enhanced by the use of superabsorbent polymers (SAP). When cracking occurs, SAP particles are exposed to the...

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Keywords

MORTAR (3)
SELF-HEALING (3)
BACTERIA (2)
EDX (2)
ELAEIS GUINEENSIS (2)
HYDROGELS (2)
MECHANICAL PROPERTIES (2)
SOIL MACROFAUNA (2)
SOIL NEMATOFAUNA (2)
SOIL QUALITY (2)
ADSORPTION (1)
ADSORPTION (WATER SORPTION) (C) (1)
BIODEPOSITION (1)
BOND STRENGTH (1)
CALCIUM-SILICATE-HYDRATE (C-S-H) (1)
CALCIUM–SILICATE–HYDRATE (C–S–H) (B) (1)
CARBONATION (1)
CARBONATION (C) (1)
CEMENT PASTE (D) (1)
CRACK (1)
CRACKING (B) (1)
DENSIFICATION (1)
DRYING (A) (1)
ENCAPSULATED PCM (1)
FIBER-REINFORCED CEMENTITIOUS COMPOSITES (1)
FLY ASH (D) (1)
GRANULATED BLAST-FURNACE SLAG (D) (1)
HIGH-PERFORMANCE CONCRETE (1)
HYDROGEL (1)
MICROBIAL CACO3 (1)
MICROSTRUCTURE (1)
MICROSTRUCTURE (B) (1)
MULTIPLE CRACKING (1)
ORGANIC RECYCLING (1)
PERMEABILITY (C) (1)
POLYMER (D) (HYDROGEL) (1)
POLYMERS (D) (1)
PORE NETWORK (1)
REVIEW (1)
SANDWICH PANELS (1)
SELF SEALING (1)
SELF-SEALING (1)
SHRINKAGE (C) (1)
STRAIN HARDENING CEMENTITIOUS COMPOSITE (1)
TEXTURE (1)
THERMAL DELAY (1)
THERMAL PROPERTIES (1)
TRANSPORT PROPERTIES (C) (1)
WORKABILITY (1)
X-RAY DIFFRACTION (1)
ΜCT (1)
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Elsevier (11)
Springer (1)

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Search results for: D. Snoeck

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