Internal hydrophobization of cementitious materials by using of organosilicon compounds

Grabowska, Kalina; Koniorczyk, Marcin

doi:10.1051/e3sconf/202017214006

Cited by 3 publications

(4 citation statements)

References 5 publications

(11 reference statements)

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“…As a consequence, the strength characteristics of cement stone concrete made with additives of inhibitors are reduced to a lesser extent. Hydrophobic additives make the pore surface immune to the waste products of microorganisms and other liquid media, preventing the dissolution and leaching of calcium-containing phases from the cement stone structure [24][25][26]. Also, calcium stearate can colmate the pores [19,27,28], preventing the entry of substances deep into the cement stone of concrete.…”

Section: Discussionmentioning

confidence: 99%

Increasing the Biostability of Concrete by the Introduction Of Additives

Rumyantseva,

Konovalova,

Narmaniya

et al. 2023

E3S Web Conf.

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To increase the resistance to fungal corrosion and improve the performance of concrete cement stone, it is proposed to introduce calcium stearate and active metal nitrates in an amount of 0.5% by weight of cement into the cement mixture at the manufacturing stage. To determine the degree of corrosion damage of cement stone by fungal microorganisms Aspergillus niger, porosity, density, water absorption and strength were determined. It has been found that the introduction of a hydrophobic additive of calcium stearate into the cement mixture during the manufacture of concrete reduces water absorption, reduces porosity and increases strength. Additives of nitrates of active metals do not affect the characteristics of the cement stone of concrete. As a result of 6 months of fungal corrosion, the water absorption, porosity and density of cement stone containing calcium stearate did not change, and the strength decreased by 4%. Metal nitrates do not prevent damage to the cement stone by microorganisms, but slow down the flow of aggressive substances to the surface of the reinforcement in concrete. The combined introduction of calcium stearate and nitrates into the cement mixture will improve the characteristics of concrete, increase its corrosion resistance and ensure the safety of reinforcement in concrete.

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Section: Discussionmentioning

confidence: 99%

Increasing the Biostability of Concrete by the Introduction Of Additives

Rumyantseva,

Konovalova,

Narmaniya

et al. 2023

E3S Web Conf.

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“…Its chemical composition, pore structure and absorbability of the surface, as well as its humidity and the type of applied hydrophobic product have a significant impact on the quality of surface treatment. However, what is more important the surface hydrophobization concerns only the near-surface zone of the material so the damage of the hydrophobic coating or the surface of the material will cause a significant reduction in the quality of surface hydrophobization or complete absence of the protection [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

“…Internal treatment carried out with using hydrophobic admixtures, seems to be more convenient and approachable way to achieve protection against water. Preparing material with the hydrophobic admixtures should be less labour-and money-consuming [1,3]. One of the newest type of compounds used as internal, hydrophobic admixtures for cement-based materials are organosilicon (silicon-based) compounds.…”

Section: Introductionmentioning

confidence: 99%

“…The polysiloxane chain is a hydrophilic structure itself but, due to the presence of non-polar alkyl groups, the whole structure of organosilicon compound is amphiphilic. The chemical character of organosilicon compounds and the similarity to the inorganic materials (such cement) cause that they interact with cement matrix in cementitious building materials, thus they are willingly used with porous, cement-based materials [1,3,4].…”

Section: Introductionmentioning

confidence: 99%

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Internal hydrophobization of cement-based materials by means of silanes

Materak

Wieczorek

Bednarska

et al. 2023

J. Phys.: Conf. Ser.

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The paper shows the opportunity of application of an organosilicon compound such as triethoxyoctylsilane (OTES) containing long, hydrophobic alkyl sidechains (octyl groups – C8H17) attached to the silicon atoms, as the admixtures for internal hydrophobization of cementitious building materials characterized by a porous internal structure. The study included the cement paste, mortar and concrete with three different hydrophobic admixtures based on triethoxyoctylsilane, but with miscellaneous concentration of the triethoxyoctylsilane in the admixture and different dosage in the fresh mix. The impact of organosilicon hydrophobic admixtures on the mechanical properties such as compressive strength, capillary water absorption of the cement mortar and concrete and the microstructure of cement paste was investigated. The hydrophobic, silicon-based admixtures decrease the capillary water absorption coefficient significantly. Even by 81.1% in case of cement mortar. The mechanical strength of cement mortar is also decreased, by 23.6%. The noticeable changes in the internal structure of pores of cement paste only for one admixture is observed.

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The Direct Cause of Amplified Wettability: Roughness or Surface Chemistry?

et al. 2021

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Higher contact angles or amplified wettability observed on surfaces of rough solid materials are typically expressed as a function of a physical dimension (roughness factor). Herein, we present a simple experimental approach that demonstrates that roughness may only magnify the inherent surface chemistry that seems to have direct influence on surface wettability. We investigate gradual change in surface chemistry (hydrophobisation) of rough and smooth glass surfaces, from a very low concentration (10−7 M) of dichlorodimethylsilane, DCDMS through various intermediate hydrophilic/hydrophobic states to when the surfaces are maximally hydrophobised with DCDMS at 0.1 M. The wettability of the modified glasses was studied by water contact angle measurements using drop shape analysis system (DSA). The data obtained indicate a deviation from Wenzel model, with the functionalized rough glass surfaces showing higher reactivity towards DCDMS when compared to the smooth glass surfaces, indicating that the two surfaces are not chemically identical. Our study reveals that just like transforming a solid material to powder, a well-divided glass (rough) surface may not only exhibit a greater surface area than the smooth counterpart as rightly predicted by the Wenzel model, but seems to be bloated with functional groups (–OH or –CH3) that can amplify surface interaction when such functional species dominate the solid surface.

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Internal hydrophobization of cementitious materials by using of organosilicon compounds

Cited by 3 publications

References 5 publications

Increasing the Biostability of Concrete by the Introduction Of Additives

Increasing the Biostability of Concrete by the Introduction Of Additives

Internal hydrophobization of cement-based materials by means of silanes

The Direct Cause of Amplified Wettability: Roughness or Surface Chemistry?

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