Development of Fibre-Cement Composites with Self-Cleaning and de-NOx Ability

2015 ◽  
Vol 1124 ◽  
pp. 123-129
Author(s):  
Martin Bohac ◽  
René Čechmánek ◽  
Theodor Staněk
Keyword(s):  
Portland Cement ◽  
Cement Composites ◽  
Composite Binder ◽  
Fibre Cement ◽  
Thin Walled ◽  
Self Cleaning ◽  
White Portland Cement

Paper deals with development of face architectural fibre-cement composites based on white Portland cement with addition of photoactive TiO2. Tests were carried on composite binder and then on the composites. The role of TiO2 on performance of materials was monitored. Selected composites were tested on self-cleaning ability, de-NOx activity and resistance to weathering in outdoor conditions. Two series of thin-walled products based on developed composites were prepared with self-cleaning ability and de-NOx activity.

scholarly journals Nanodispersed TiO2 hydrosol modified Portland cement paste: The underlying role of hydration on self-cleaning mechanisms

2020 ◽  
Vol 136 ◽  
pp. 106156 ◽  
Author(s):  
Zixiao Wang ◽  
Qingliang Yu ◽  
Florent Gauvin ◽  
Pan Feng ◽  
Ran Qianping ◽  
...  
Keyword(s):  
Portland Cement ◽  
Cement Paste ◽  
Self Cleaning ◽  
Portland Cement Paste

scholarly journals CEMENT STONE STRUCTURE COMPACTION WITH COMPOSITE BINDER

2019 ◽  
pp. 195-206 ◽  
Author(s):  
R. S. Fediuk ◽  
A. V. Baranov ◽  
D. V. Khromenok ◽  
I. R. Zelenskiy ◽  
S. V. Kim
Keyword(s):  
Portland Cement ◽  
Silicon Dioxide ◽  
Structure Formation ◽  
Quartz Sand ◽  
Strength Properties ◽  
Planetary Mill ◽  
Cement Stone ◽  
Composite Binder ◽  
Silica Additive

The aim of the paper is to improve the strength properties of cement stone via control for structure formation. The composite binder composition includes the type CEM I 42.5N (58–70%) Portland cement, active silica additive (25–37%), quartz sand (2.5–7.5%) and limestone crushed waste (2.5–7.5%). The optimum technology of mechanochemical activation is proposed for the cement stone. The optimization of the structure formation process is provided by the mineral-mineral modifier, crushed together with Portland cement in a planetary mill to a specific surface of 550 m2/kg. The amorphous phase of silicon dioxide in the composition of the modifier intensifies the calcium hydroxide binding forming during alite hydration. It contributes to the growth in low-basic calcium silicate and lowers the cement stone basicity, while reducing the amount of portlandite. The crystalline phase of β-quartz silicon dioxide plays the role of crystallization centers new formations and the cement stone microstructure compaction. Limestone particles contribute to the formation of calcium hydrocarbonate and act as a microfiller together with fine ground quartz sand clogging the pores in the cement stone.

Testing of Surface Photoactivity of Fibre-Cement Composites

2014 ◽  
Vol 1000 ◽  
pp. 35-38 ◽  
Author(s):  
Martin Boháč ◽  
Theodor Staněk ◽  
Petr Urbánek
Keyword(s):  
Uv Light ◽  
Crystalline Form ◽  
Cement Composites ◽  
Visual Stability ◽  
Composite Matrix ◽  
Inorganic Particles ◽  
Proper Form ◽  
Fibre Cement ◽  
Self Cleaning ◽  
Weathering Resistance

Paper deals with testing of surface photoactivity of fibre-cement composites. Self-cleaning ability, de-NOx activity, visual stability and weathering resistance were tested. Carriers of photoactivity were four different nanopowders with high content of anatase; crystalline form of TiO2. Photocatalytic properties of TiO2 particles are maintained even after mixing with cement in composite matrix. Natural photolysis as reaction of material and UV light is accelerated in presence of a proper form of TiO2 as a catalyst which by producing free radicals is able to oxidize organic matter and even small inorganic particles. Oxidized material is mostly less harmful considering the de-NOx process and decomposition of other gaseous pollutants. By this reaction the surface of composites containing large number of TiO2 particles is able to maintain its original appearance by so called self-cleaning ability.

scholarly journals Influence of nano silica on the fresh, hardened and durability properties of self-cleaning white Portland cement mortars

2019 ◽  
Vol 20 (3) ◽  
pp. 270-275 ◽  
Author(s):  
Atta-ur-Rehmana ◽  
Jae-Suk Ryou ◽  
Sadam Hussain Jakhrani ◽  
Hong-Gi Kim ◽  
Jeong Bae Lee ◽  
...  
Keyword(s):  
Portland Cement ◽  
Nano Silica ◽  
Durability Properties ◽  
Cement Mortars ◽  
Self Cleaning ◽  
White Portland Cement

scholarly journals Crystal-Chemical and Thermal Properties of Decorative Cement Composites

Materials ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 4793
Author(s):  
Vilma Petkova ◽  
Ventseslav Stoyanov ◽  
Bilyana Kostova ◽  
Vladislav Kostov-Kytin ◽  
Alexander Kalinkin ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
Portland Cement ◽  
Building Materials ◽  
Raw Materials ◽  
Cement Composites ◽  
X Ray Diffraction ◽  
Fundamental Study ◽  
Materials Development ◽  
Marble Powder ◽  
White Portland Cement

The advanced tendencies in building materials development are related to the design of cement composites with a reduced amount of Portland cement, contributing to reduced CO2 emissions, sustainable development of used non-renewal raw materials, and decreased energy consumption. This work deals with water cured for 28 and 120 days cement composites: Sample A—reference (white Portland cement + sand + water); Sample B—white Portland cement + marble powder + water; and Sample C white Portland cement + marble powder + polycarboxylate-based water reducer + water. By powder X-ray diffraction and FTIR spectroscopy, the redistribution of CO32−, SO42−, SiO44−, AlO45−, and OH− (as O-H bond in structural OH− anions and O-H bond belonging to crystal bonded water molecules) from raw minerals to newly formed minerals have been studied, and the scheme of samples hydration has been defined. By thermal analysis, the ranges of the sample’s decomposition mechanisms were distinct: dehydration, dehydroxylation, decarbonation, and desulphuration. Using mass spectroscopic analysis of evolving gases during thermal analysis, the reaction mechanism of samples thermal decomposition has been determined. These results have both practical (architecture and construction) and fundamental (study of archaeological artifacts as ancient mortars) applications.

Laser patterned titanium surfaces with superior antibiofouling, superhydrophobicity, self-cleaning and durability: Role of line spacing

2021 ◽  
pp. 127257
Author(s):  
S.C. Vanithakumari ◽  
Ambar Kumar Choubey ◽  
C. Thinaharan ◽  
Ram Kishor Gupta ◽  
R.P. George ◽  
...  
Keyword(s):  
Line Spacing ◽  
Titanium Surfaces ◽  
Self Cleaning
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