scholarly journals The effect of silanes as integral hydrophobic admixture on the physical properties of cement based materials

2021 ◽  
Vol 2069 (1) ◽  
pp. 012045
Author(s):  
K Grabowska ◽  
A Wieczorek ◽  
D Bednarska ◽  
M Koniorczyk
Keyword(s):  
Mechanical Properties ◽  
Mechanical Strength ◽  
Physical Properties ◽  
Water Absorption ◽  
Cement Mortar ◽  
Organosilicon Compounds ◽  
Capillary Water ◽  
Main Ingredient ◽  
Capillary Water Absorption ◽  
Cement Based Materials

Abstract The paper explores the possibility of using organosilicon compounds (e.g., poly(dimethylsiloxane) and triethoxyoctylsilane) in commercial admixtures as internal hydrophobization agents for porous cement-based materials. The study involved the cement mortar with five different hydrophobic admixtures. Four of them is based on triethoxyoctylsilane, but with various concentration of the main ingredient, and one of them on poly(dimethylsiloxane). Mechanical properties, capillary water absorption, as well as microstructure were investigated. The organosilicon admixtures efficiently decrease the capillary water absorption even by 81% decreasing mechanical strength of cement mortar at the same time even by 55%. Only one admixture, based on poly(dimethylsiloxane) caused significant changes in microstructure of cement mortar.

scholarly journals Internal hydrophobization of cementitious materials by using of organosilicon compounds

2020 ◽  
Vol 172 ◽  
pp. 14006
Author(s):  
Kalina Barbara Grabowska ◽  
Marcin Koniorczyk
Keyword(s):  
Contact Angle ◽  
Cement Mortar ◽  
Cementitious Materials ◽  
Organosilicon Compounds ◽  
Capillary Water ◽  
Capillary Water Absorption ◽  
Cement Based Materials ◽  
Negative Feature ◽  
Physical And Chemical ◽  
The Impact

The low resistance to harmful acting of water confined in porous, cement-based materials is a negative feature. As the consequence of porous structure these materials have not sufficient resistance as some physical and chemical detrimental factors. The objective of this paper was to evaluate the impact of organosilicon admixture based on silane and siloxane on physical properties of cement mortar. Internal hydrophobization can significantly improve the durability of a cement materials. At this paper the results of mechanical strength, absorbability and capillary water absorption of internally hydrophobized cement mortar are presented. In addition, a contact angle test was used to assess the changes in wetting angle of cement paste.

scholarly journals Analysis of the Effect of Nano-SiO2 and Waterproofing Agent on the Water Transportation Process in Mortar Using NMR

2020 ◽  
Vol 10 (21) ◽  
pp. 7867
Author(s):  
Tao Meng ◽  
Huadong Wei ◽  
Kanjun Ying ◽  
Menghua Wang
Keyword(s):  
Water Absorption ◽  
Moisture Diffusion ◽  
Test Results ◽  
Capillary Water ◽  
Process Data ◽  
Capillary Water Absorption ◽  
Nano Sio2 ◽  
Water Transportation ◽  
Cement Based Materials ◽  
Transportation Process

Moisture diffusion in cement-based materials significantly impacts its durability. In this study, we analyzed the effect of adding a waterproofing agent and nano-SiO2 (NS) on the water transportation process in mortar using capillary water absorption tests and nuclear magnetic resonance (NMR) technology. The results indicate that the combined action of the waterproofing agent and nano-SiO2 drastically reduce the capillary water absorption coefficient and have a more significant impact than only adding the waterproofing agent. The moisture diffusion in different sections of the mortar during the water absorption process is obtained from the NMR test results and two function models. Comparative studies indicate that the NMR test results have good correlation with the capillary water absorption test results and provide accurate process data. The NMR analysis results offer a new analytical method to characterize the porosity of cement-based materials by continuously monitoring small-pitch sections.

scholarly journals Effect of Portland Cement versus Sulphoaluminate Cement on the Properties of Blended Lime-Based Mortars Prepared by Carbide Slag

Materials ◽  
2019 ◽  
Vol 12 (7) ◽  
pp. 1012
Author(s):  
Song Nie ◽  
Jianfeng Wang ◽  
Mingzhang Lan ◽  
Yali Wang ◽  
Qiaowei Zhang
Keyword(s):  
Mechanical Properties ◽  
Portland Cement ◽  
Water Absorption ◽  
Drying Shrinkage ◽  
Hydrated Lime ◽  
Capillary Water ◽  
Capillary Water Absorption ◽  
Sulphoaluminate Cement ◽  
Carbide Slag ◽  
Green Development

In order to improve the properties of lime-based mortars and promote the green development of the construction industry, blended lime-based mortars were prepared by using carbide slag instead of hydrated lime, and the additions of Portland cement and sulphoaluminate cement were studied in our work. The paper focused on mechanical properties, porosity, capillary water absorption and drying shrinkage of both types of blended mortars. The chemical composition and microstructure of hydration products were investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results show that sulphoaluminate cement provided more contributions to mechanical properties, capillary water absorption and early shrinkage compared to Portland cement.

Use of polyvinyl chloride (PVC) powder and granules as aggregate replacement in concrete mixtures

2016 ◽  
Vol 23 (2) ◽  
pp. 209-216 ◽  
Author(s):  
Hakan Bolat ◽  
Pınar Erkus
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Water Absorption ◽  
Polyvinyl Chloride ◽  
Physical And Mechanical Properties ◽  
High Strength ◽  
Capillary Water ◽  
Capillary Water Absorption ◽  
Concrete Mixtures ◽  
Compressive Strength Test

AbstractConcrete is one of the materials in which polymer wastes are utilized. Generally, these wastes are added at specific rates in scientific studies but an important problem of waste polymers is size irregularity. Even when consistent dosage rates are used, variations in polymer size can lead to variability in the physical and mechanical properties of the concrete produced. The aim of this study is to determine physical and mechanical properties of polyvinyl chloride (PVC)-containing concretes. In order to produce normal and high strength concretes, 10%, 20%, and 30% replacement ratios of PVC powder and granules by volume of aggregate are used. Slump, fresh and hardened densities, compressive strength, capillary water absorption, and abrasion were tested on all concrete types. As the PVC ratio increases, important changes are seen in all physical and mechanical concrete properties. The unit weights of the 10%, 20%, and 30% replacement PVC powder concretes are lower by ∼4%, 8%, and 13%, respectively, as compared to the reference mixtures, and the replacement PVC granule concretes are lower by ∼2%, 4%, and 7%. Compressive strength test results showed similar trends. As PVC replacement increases, the capillary water absorption decreases between 10% and 50%, and abrasion decreases between 27% and 77%.

Waterproof Performance of Polymer-Modified Cement Mortar

2013 ◽  
Vol 687 ◽  
pp. 213-218
Author(s):  
Ru Wang ◽  
Dao Xun Ma ◽  
Pei Ming Wang
Keyword(s):  
Water Absorption ◽  
Penetration Depth ◽  
Cement Mortar ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Capillary Water ◽  
Acrylic Copolymer ◽  
Capillary Water Absorption ◽  
Cement Mortars ◽  
Styrene Butadiene

This paper tested the capillary water absorption, impermeability and cracking of cement mortars modified with three polymers respectively and founded the correlation of cracking with the waterproof performance. The results show that with the polymer content increasing, especially as the polymer/cement ratio (mp/mc) increases from 0% to 5%, the reduction in the capillary water absorption and the penetration depth of water into mortar is significant. When the mp/mc is more than 15%, the increase of the mp/mc in all mortars has little effect on the capillary water absorption and the penetration depth. For the purpose of reducing the cracking weighted value, the styrene-butadiene rubber (SBR) dispersion and the styrene-acrylic copolymer (SAE) powder are superior to the SAE dispersion. Regardless what kinds of polymers, the capillary water absorption and the penetration depth of water into mortar show exponential growth with the increasing cracking weighted value.

scholarly journals Influence of Sawdust Particle Sizes on the Physico-Mechanical Properties of Unfired Clay Blocks

Designs ◽  
2021 ◽  
Vol 5 (3) ◽  
pp. 57
Author(s):  
Nusrat Jannat ◽  
Rafal Latif Al-Mufti ◽  
Aseel Hussien ◽  
Badr Abdullah ◽  
Alison Cotgrave
Keyword(s):  
Mechanical Properties ◽  
Water Absorption ◽  
Linear Shrinkage ◽  
The Other ◽  
Raw Material ◽  
Particle Sizes ◽  
Capillary Water ◽  
Water Absorption Coefficient ◽  
Capillary Water Absorption ◽  
The Impact

Sawdust, which is a waste/by-product of the wood/timber industry, can be utilised as a valuable raw material in building material production due to its abundance and low cost. However, the application of sawdust in the manufacture of unfired clay blocks has received little investigation. Furthermore, the impact of different sawdust particle sizes on the properties of unfired clay blocks has not been studied. Therefore, this study screened sawdust at three different particle sizes: SP-a (212 μm < x < 300 μm), SP-b (425 μm < x < 600 μm) and SP-c (1.18 mm < x < 2.00 mm), to examine their effects on the physical and mechanical properties of unfired clay blocks. The density, linear shrinkage, capillary water absorption and flexural and compressive strengths were among the tests performed. Different sawdust percentages, i.e., 2.5%, 5%, 7.5% and 10% of the total weight of the clay, were considered. The tests results show that when sawdust was added to the mixture, the density of the samples reduced for all particle sizes. However, the linear shrinkage increased in SP-a samples but decreased in the other two particle size samples as the sawdust percentage increased from 2.5% to 10%. On the other hand, the capillary water absorption coefficient increased while the strength decreased with increasing sawdust content for all three groups. The highest compressive strength (CS) and flexural strength (FS) were achieved at 2.5% of sawdust content. Furthermore, it was observed that SP-b (CS—4.74 MPa, FS—2.00 MPa) samples showed the highest strength followed by SP-a (CS—4.09 MPa, FS—1.69 MPa) and SP-c (CS—3.90 MPa, FS—1.63 MPa) samples. Consequently, good-quality unfired clay blocks can be manufactured using sawdust up to 2.5% with particle sizes ranging between 600 and 425 μm.

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