Experimental Investigations of Concrete on Slag Portland Cement as a Coating Material for Agricultural Aerodromes

2020 ◽  
Vol 864 ◽  
pp. 19-26
Author(s):  
Oleksii Yanin ◽  
Tetiana Yemelianova ◽  
Svetlana Novikova
Keyword(s):  
Compressive Strength ◽  
Portland Cement ◽  
Quality Indicators ◽  
Frost Resistance ◽  
Bending Strength ◽  
Coating Material ◽  
Experimental Investigations ◽  
Surface Active ◽  
Concrete Testing ◽  
Selection Of

The results of concrete testing on sulphate-resistant slag Portland cement for rigid coating of agricultural roads and aerodromes are presented in the paper. The results of experimental investigations of samples in the form of cubes on compressive strength and samples in the form of prisms on bending strength under different hardening conditions and at different water-cement ratios are presented. Selection of hardening conditions of concrete on sulphate-resistant slag Portland cement was made based on achievement of quality indicators no worse than in concrete on Portland cement. The expediency of introducing into the concrete organic surface-active additives - lignosulfonates in order to achieve the required strength is grounded. It is proved experimentally that the proposed concrete has sufficient frost resistance.

scholarly journals Biofuel Combustion Fly Ash Influence on the Properties of Concrete

2016 ◽  
Vol 7 (5) ◽  
pp. 546-550
Author(s):  
Aurelijus Daugėla ◽  
Džigita Nagrockienė ◽  
Laurynas Zarauskas
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Portland Cement ◽  
Water Absorption ◽  
Frost Resistance ◽  
Ash Content ◽  
Mineral Admixtures ◽  
Binding Agent ◽  
Materials Used ◽  
Plasticizing Admixture

Cement as the binding agent in the production of concrete can be replaced with active mineral admixtures. Biofuel combustion fly ash is one of such admixtures. Materials used for the study: Portland cement CEM I 42.5 R, sand of 0/4 fraction, gravel of 4/16 fraction, biofuel fly ash, superplasticizer, water. Six compositions of concrete were designed by replacing 0%, 5%, 10%, 15% 20%, and 25% of cement with biofuel fly ash. The article analyses the effect of biofuel fly ash content on the properties of concrete. The tests revealed that the increase of biofuel fly ash content up to 20% increases concrete density and compressive strength after 7 and 28 days of curing and decreases water absorption, with corrected water content by using plasticizing admixture. It was found that concrete where 20% of cement is replaced by biofuel ash has higher frost resistance.

scholarly journals Frost resistance of cement-sand and concrete beams during unilateral freezing

2021 ◽  
Vol 2 (1) ◽  
pp. 64-74
Author(s):  
Nepomyach Alexander Nikolaevich ◽  
Vyrovoy Valeriy Nikolaevich ◽  
Chistyakov Artem Aleksaedrovich
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Frost Resistance ◽  
Bending Strength ◽  
Concrete Beams ◽  
Transmission Rate ◽  
Beam Structure ◽  
Freeze Thaw ◽  
Damage Coefficient ◽  
Negative Temperatures

Abstract The work investigates changes in the beam structure under the action of local freezing, which leads to a change of the mechanical properties of the material and, consequently, of the beam structure. Two types of beam samples were used: from cement-sand mortar and from concrete. The work investigates the change in the development of deformations depending on the conditions of freezing of samples. The second accelerated method for assessing frost resistance was chosen according to DSTU B В.2.7-47-96. An accelerated method was chosen for assessing frost resistance at the temperature of -20 ±2 C°. After every five freeze-thaw cycles, the following changes were monitored: mass, water absorption, ultrasound transmission rate, damage coefficient, tensile bending strength, splitting strength, compressive strength, carbonization depth. The results showed that both in concrete and in mortar samples, the compressive strength after freezing was lower by 8% and 15% accordingly. The experimental results obtained confirm the assumptions made that the frost resistance of the material depends on the conditions of exposure of negative temperatures on products and structures and it can be used in a wider range of construction which will push regional development.

scholarly journals Light fine-grained fibrous concrete for small architectural forms

2018 ◽  
Vol 212 ◽  
pp. 01008 ◽  
Author(s):  
Albina Baranova ◽  
Margarita Badenikova ◽  
Pavel Shustov ◽  
Christina Rudykh ◽  
Anna Bobrova
Keyword(s):  
Portland Cement ◽  
Bending Strength ◽  
Basalt Fiber ◽  
Strength Characteristics ◽  
Concrete Mixture ◽  
Optimal Ratio ◽  
Fine Grained ◽  
Fibrous Concrete ◽  
Selection Of

The selection of the composition of a highly mobile concrete mixture for manufacturing small architectural forms has been performed, and the strength characteristics of light fine-grained fibrous concrete have been studied. It has been experimentally established that the optimal ratio of the Portland cement to microsilica is 1: 1. The introduction of basalt fiber in the amount of 0.5% of the mass of solids contributes to the increase in bending strength of fine-grained concrete to 70%.

Functional properties of foam concrete with ultra-small additives of carbon nanotubes

2021 ◽  
Vol 1 ◽  
pp. 49-57
Author(s):  
R. D. Sldozyan ◽  
◽  
A. G. Tkachev ◽  
Z. A. Mikhaleva ◽  
A. E. Burakov ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Compressive Strength ◽  
Portland Cement ◽  
Water Absorption ◽  
Bending Strength ◽  
Testing Machine ◽  
Control Sample ◽  
Strength Increase ◽  
Foam Concrete ◽  
High Concentrations

We studied the properties of foam concrete based on Portland cement, modified with of the ultra-low concentration carbon nanotubes addition. Carbon nanotubes (Taunit-24) with a mass percentage of 0.0004, 0.0006, 0.0008, 0.001 and 0.0012 % by weight of cement were used for the dispersed reinforcement of foam concrete based on Portland cement. To determine of the modified concrete samples strength characteristics an IP-M testing machine was used. The results of the study showed that the use of the carbon nanotubes additives in concentrations of 0.0004, 0.0006, 0.0008 % allows to gradually increase the compressive strength compared to the control sample. The compressive strength increase on 1, 12.4 and 68 %, respectively, and gradually decreases at concentrations of 0.001 and 0.0012 % from 55.5 to 45.7 %, respectively. A positive effect of the carbon nanotubes additive (0.0004, 0.0006 and 0.0008 %) is also noted when testing the bending strength by 3.7, 13.7 and 33.7%, respectively. With a further increase in the additive content (0.001 and 0.0012 %), the strength decreases to 20 and 14.8 %, respectively. When assessing water absorption, a decrease was showed with additives with concentrations of 0.0004 and 0.0006 %. However, at high concentrations of additives (0.0008, 0.001 and 0.0012 %), the highest percentage of water absorption was established.

scholarly journals Change of Mechanical Properties of Repair Mortars after Frost Resistance Rests

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3199
Author(s):  
Grażyna Łagoda ◽  
Tomasz Gajda
Keyword(s):  
Compressive Strength ◽  
Frost Resistance ◽  
Bending Strength ◽  
Primary Repair ◽  
Winter Season ◽  
Resistance Testing ◽  
Threshold Temperature ◽  
Large Temperature ◽  
Repair Mortars ◽  
The Impact

The use of repair mortars for concrete structures repair with no or limited resistance to the impact caused by freeze and thaw cycles is often the primary repair failure cause. This is particularly important in Poland. Due to the geographical location of the country, there is a large temperature difference between summer and winter. The number of passes through the threshold temperature of 0 °C throughout the year in the winter season exceeds 100. The article presents a comparison of the frost resistance results of tests of repair mortars. The first method was performed according to the Polish Guidelines (without the use of de-icing salts) and the second method according to PN-EN 1504-3 (with the use of de-icing salts). The results obtained were inconsistent in many areas. In particular, significant differences in the results for the change in compressive strength and the change in bending strength were observed. In the case of the frost resistance testing without the use of de-icing salts, a decrease in compressive strength was usually accompanied by a decrease in bending strength. In the case of frost resistance tests with the use of de-icing salts, an increase in the bending strength of mortars was observed (even by a dozen or so percent) with a decrease in the compressive strength of mortars (even by several dozen percent).

scholarly journals Performance and Durability of Rendering and Basecoat Mortars for ETICS with CSA and Portland Cement

2021 ◽  
Vol 6 (4) ◽  
pp. 60
Author(s):  
Tiago Trigo ◽  
Inês Flores-Colen ◽  
Luís Silva ◽  
Nuno Vieira ◽  
Ana Raimundo ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Energy Consumption ◽  
Portland Cement ◽  
Bending Strength ◽  
Setting Time ◽  
Cement Matrix ◽  
Calcium Sulfoaluminate Cement ◽  
Calcium Sulfoaluminate ◽  
Composite Systems

The production of Portland cement (OP) is commonly associated to significant level of energy consumption and gas emissions. The use of calcium sulfoaluminate cement (CSA) can be a sustainable alternative binder, since its production releases about half of the CO2 emissions and its clinker requires 200 °C lower temperatures, when compared to OP. Furthermore, CSA has fast setting time and achieves higher strength in shorter periods, as well as reduced shrinkage. This paper discusses the incorporation of CSA in rendering mortars and basecoat mortars for ETICS (External Thermal Insulation Composite Systems). The physical-mechanical properties of mortars made with OP and CSA cements were experimental evaluated. The results showed that the introduction of CSA generally improves shrinkage, compressive strength, water absorption at low pressure, enhances the tensile bending strength and decreases the setting time. The amount of CSA introduced into the mixture significantly affected the properties of the cement matrix.

scholarly journals The Assessment of Possibility of Using Sanitary Ceramic Waste as Concrete Aggregate—Determination of the Basic Material Characteristics

2018 ◽  
Vol 8 (7) ◽  
pp. 1205 ◽  
Author(s):  
Paweł Ogrodnik ◽  
Jacek Szulej
Keyword(s):  
Portland Cement ◽  
Frost Resistance ◽  
Bending Strength ◽  
Soft Clay ◽  
Recycled Aggregate ◽  
Basic Material ◽  
Concrete Aggregate ◽  
Depth Of Penetration ◽  
Initial Strength ◽  
Natural Aggregate

This article presents the possibilities of using soft clay pottery waste as concrete aggregate. There is shown a new approach of complete exchange natural aggregate in concrete with recycled aggregate, i.e., crushed ceramic of two fractions 0–4 and 4–8 mm. Basic characteristics of aggregate were evaluated, i.e., phase composition and crush strength. Drawing on past experiences, two concrete mixes were designed that were based on Portland cement 32.5 R used for ordinary concrete and aluminous Górkal 70, which is characterized by high initial strength and the fact that Al2O3 is the binding factor. The prepared concrete samples were subjected to maintenance for the next 28 days, and then tests started. A series of tests were performed on the properties of concrete obtained, including a compressive strength and bending strength, an abrasion resistance, frost resistance, water absorption, depth of penetration of water under pressure, and bulk density of concrete. The research confirmed assumptions that it is possible to completely replace the natural aggregate with aggregate made of soft clay pottery waste. Both designed concretes showed high compressive and bending strength, as well as low absorbability and abrasiveness. It was also found that soaking in water, as well as its duration, adversely affects the strength properties of the designed concretes. Regarding concrete based on Portland cement, it was also demonstrated that the concrete has a high frost resistance and resistance to penetration of water under pressure.

scholarly journals Application of Ilmenite Mud Waste as an Addition to Concrete

Materials ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 866 ◽  
Author(s):  
Filip Chyliński ◽  
Krzysztof Kuczyński ◽  
Paweł Łukowski
Keyword(s):  
Compressive Strength ◽  
Titanium Dioxide ◽  
Fly Ash ◽  
Portland Cement ◽  
Hazardous Waste ◽  
Bending Strength ◽  
Reactive Material ◽  
Comparative Tests ◽  
Hazardous Compounds ◽  
Potential Use

Storing waste in concrete instead of landfills is environmentally friendly and also might make concrete more sustainable if some part is replaced with cement. This article presents a new way of valorising hazardous waste, namely ilmenite MUD from the production of titanium dioxide, which is used as a reactive additive to concrete. In fact, there are currently no articles presenting the way of valorisation that is presented in this paper. The global annual production of MUD is estimated to be about 0.7 million tons. Valorisation is possible due to the additional rinsing and filtering in the factory, which also confirms the novelty of this article. In this operation, the most hazardous compounds are returned back to the factory process. Rinsed mud (RMUD) is a pozzolanic reactive material with the potential use as a substitute of a part of Portland cement in concrete and other cementitious binders, like siliceous fly ash (FA). The level of RMUD pozzolanic activity is as high as the activity of siliceous fly ash. Comparative tests of concretes containing RMUD and fly ash, such as compressive strength, bending strength and shrinkage, were conducted. The concrete containing RMUD reached almost 90% of compressive and 108% of bending strength after 28 days of curing, compared to FA concrete. The results presented in this article are very promising and might point to a new way of valorising ilmenite mud waste.

scholarly journals THE EFFECT OF MODIFIED ADDITIVES ON STRENGTH AND FROST RESISTANCE IN FIBROUS CONCRETE OF RIGID ROAD PAVEMENTS

2020 ◽  
pp. 68-74
Author(s):  
A.V. Mishutin ◽  
◽  
L. Chintea ◽  
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Portland Cement ◽  
Frost Resistance ◽  
Polypropylene Fiber ◽  
High Strength ◽  
Fibrous Concrete ◽  
Fiber Concrete ◽  
Mineral Additive ◽  
Compressive Strength Of Concrete

Abstract. The research is devoted to the development of compositions of modified fiber concrete of rigid road pavements with high strength and frost resistance through the use of metakaolin and a polycarboxylate type superplasticizer. The compressive strength, tensile strength under bending and frost resistance of concrete and fiber concrete of rigid road pavements were investigated according to the 4-factor optimal plan. In the experiment the amount of concrete components varied: Portland cement, polypropylene fibers, metakaolin, the polycarboxylate type additives Coral ExpertSuid-5. All mixtures had equal mobility P2 and their W/C depended on the composition of concrete. The use of polypropylene fiber and metakaolin necessitates an increase of W/C to maintain the mobility of the mixture. Increasing the amount of Coral ExpertSuid-5 additive in concrete to 0.9-1% allows to reduce significantly W/C of the mixture. Metakaolin as an active mineral additive increases the compressive strength and tensile strength of concrete. Rational in terms of increasing strength is the amount of metakaolin at the level of 20..22 kg/m3. With an increase in the amount of Coral ExpertSuid-5 additive to 0.9..1% due to a decrease of W/C, the compressive strength of concrete increases by 5..7 MPa, and the tensile strength increases by about 0.5 MPa. Due to the introduction of polypropylene fiber, the tensile strength of concrete in bending increases by 0.6..0.9 MPa. But dispersed reinforcement does not affect the compressive strength of concrete. The developed fiber concrete using a rational amount of modifiers, depending on the amount of Portland cement in the composition, has a compressive strength from 55 MPa to 70 MPa and tensile strength from 8 MPa to 9.5 MPa. The high strength of fiber-reinforced concretes allows their use in road pavements with the highest load. Frost resistance of concrete increases by 50 cycles or more when using fiber in an amount of 1.5-2 kg/m3. Due to the use of a rational amount of modifiers (0.8-1% Coral ExpertSuid-5 additive and 15-20 kg/m3 metakaolin), frost resistance of concrete and fiber concrete increases by 50-100 cycles. The developed modified fiber concretes of rigid road pavements depending on the amount of Portland cement in the composition have frost resistance from F350 to F450, which ensures their sufficient durability.

scholarly journals Mechanical properties of cement and cement-asphalt matrices with rubber powder

2017 ◽  
Vol 16 (3) ◽  
pp. 053-063
Author(s):  
Jerzy Kukiełka
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Compressive Strength ◽  
Bending Strength ◽  
Indirect Tensile Strength ◽  
Preliminary Evaluation ◽  
Asphalt Emulsion ◽  
Rubber Powder ◽  
Indirect Tensile ◽  
Concrete Testing

Cement matrices are known from concrete testing. Cement-asphalt matrices made of cement and asphalt emulsion are used in mineral-cement-emulsion mixes (MCEM). The matric strength in MCEM mixtures has not been studied so far. Cement-asphalt matrices with 0/1 mm rubber powder are proposed by the author for use in the MCEM [3, 26]. In this paper the results of the investigation of the mechanical properties of matrices are presented for comparative purposes and for the preliminary evaluation of their suitability for MCEM. The following tests were made: indirect tensile strength, bending strength, compressive strength and rigidity modules in NAT and 4 PB-PR.

Sign in / Sign up

Export Citation Format

Share Document