scholarly journals Durability Properties of Five Years Aged Lightweight Concretes Containing Rubber Aggregates

2017 ◽  
Author(s):  
Malika Medine ◽  
Habib Trouzine ◽  
José Barroso De Aguiar ◽  
Aissa Asroun
Keyword(s):  
Elevated Temperature ◽  
Water Absorption ◽  
Partial Replacement ◽  
Rubber Content ◽  
Experimental Assessment ◽  
Freeze Thaw ◽  
Coarse Aggregates ◽  
Durability Properties ◽  
Mass Losses ◽  
Rubber Aggregates

Scrap tyres are one of the most important wastes. They can be used in different ways because of their availability and their non-degradable nature. This paper aims to demonstrate their reuse through durability properties experimental assessment of lightweight concretes aged five years, incorporating rubber aggregates as partial replacement of 5%, 7.5% and 10% of coarse/fine and coarse aggregates. The effect of the rubber aggregates on the lightweight concretes durability has been analysed. Firstly, the water absorption was evaluated, and then the mass losses were measured through many tests: freeze-thaw, elevated temperature and attack by Na2SO4 and HCl solutions. Wetting-drying cycles were carried out in order to accelerate the aging of the studied lightweight concretes and to reduce the tests duration. It has been observed that the water absorption decreased with small rubber content. The mass losses of the mixes were almost depending on rubber aggregates content and size, and the exposures duration.

scholarly journals Durability properties of self-compacting concrete (SCC) incorporating cassava peel ash (CPA)

2021 ◽  
Vol 40 (4) ◽  
pp. 584-590
Author(s):  
M.T. Abdulwahab ◽  
O.A.U. Uche
Keyword(s):  
Elevated Temperature ◽  
Environmental Pollution ◽  
Water Absorption ◽  
Partial Replacement ◽  
Replacement Level ◽  
Self Compacting Concrete ◽  
Durability Properties ◽  
Natural Decomposition ◽  
Cassava Peels ◽  
Cassava Peel

Self-compacting concrete (SCC) is a highly flowable concrete with enhanced strength and surface finish. The production of SCC requires high content of Portland cement (PC), which in turn consumes a lot of energy and emits greenhouse gases like CO2 and CH4 to the atmosphere during its production. Also, environmental pollution arising from agricultural wastes such as cassava peels, groundnut shells, is a cause of concern. Cassava processing centres alone generate approximately 40 million tons of wastes per annum in Nigeria, while attempts to eliminate them through burning or natural decomposition is sometimes unsuccessful. It is important to reduce the CO2 emission during the production of PC and environmental pollution caused by cassava peels through partial replacement of cement in the SCC. This study assesses the durability properties of SCC produced with cassava peel ash (CPA) at 5 %, 10 %, 15 %, 20 % and 25 % replacement level of cement. The effects of water absorption, acid (H2SO4) and salt (MgSO4) attack and elevated temperature were investigated on the CPA-SCC specimens. It was revealed that the CPA improves the resistance to H2SO4 and MgSO4 degradation while the performance is poor when subjected to elevated temperature compared to the control specimen. Also, an optimum of 5% cement replacement is recommended for grade 35 compressive strength of CPA-SCC. However, the rate of water absorption reduced to a minimum when CPA is used in SCC as a result of an improved pore structure of the CPA-SCC specimen.

scholarly journals Strength of Concrete containing Rubber as Partial Replacement of Coarse Aggregate

2020 ◽  
Vol 9 (1) ◽  
pp. 2061-2063
Keyword(s):  
Coarse Aggregate ◽  
Partial Replacement ◽  
Structural Elements ◽  
Structural Members ◽  
Rubberized Concrete ◽  
Cement Concrete ◽  
Coarse Aggregates ◽  
Strength Tests ◽  
Rubber Concrete ◽  
Rubber Aggregates

Effective Waste management is the need of the hour in the world. Solid wastes generated by the industries becomes hazardous as days passes by, used tyres are one such waste material that can affect our environment and people. Rubber tyre wastes can be used as partial replacement for the aggregates. In this study, rubber tyre wastes were used as coarse aggregates. And those rubber aggregates are used as partial replacement of coarse aggregates in the cement concrete (5%, 10%, 15%, 20%). The specimens were subjected to different strength tests as per the standards. It is found that the strength of the concrete is greatly reduced as the percentage of replacement of rubber aggregates is increased. Due to their low strength this type concrete cannot be used for load bearing or structural members. However rubberized concrete can be used for non –structural elements and in future a study can be made whether rubber concrete can be used for pavement blocks.

scholarly journals Durability Performance of Self-Compacting Concrete Containing Crumb Rubber, Fly Ash and Calcium Carbide Waste

Materials ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 488
Author(s):  
Sylvia Kelechi ◽  
Musa Adamu ◽  
Abubakar Mohammed ◽  
Yasser Ibrahim ◽  
Ifeyinwa Obianyo
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Water Absorption ◽  
Calcium Carbide ◽  
Crumb Rubber ◽  
Partial Replacement ◽  
Fine Aggregate ◽  
Acid Attack ◽  
Self Compacting Concrete ◽  
Durability Properties

Waste tire disposal continues to pose a threat to the environment due to its non-biodegradable nature. Therefore, some means of managing waste tires include grinding them to crumb rubber (CR) sizes and using them as a partial replacement to fine aggregate in concrete. However, the use of CR has a series of advantages, but its major disadvantage is strength reduction. This leads to the utilization of calcium carbide waste (CCW) to mitigate the negative effect of CR in self-compacting concrete (SCC). This study investigates the durability properties of SCC containing CR modified using fly ash and CCW. The durability properties considered are water absorption, acid attack, salt resistance, and elevated temperature of the mixes. The experiment was conducted for mixes with no-fly ash content and their replica mixes containing fly ash to replace 40% of the cement. In the mixes, CR was used to partially replace fine aggregate in proportions of 0%, 10%, and 20% by volume, and CCW was used as a partial replacement to cement at 0%, 5%, and 10% by volume. The results indicate that the mixes containing fly ash had higher resistance to acid (H2SO4) and salt (MgSO4), with up to 23% resistance observed when compared to the mix containing no fly ash. In addition, resistance to acid attack decreased with the increase in the replacement of fine aggregate with CR. The same principle applied to the salt attack scenario, although the rate was more rapid with the acid than the salt. The results obtained from heating indicate that the weight loss was reduced slightly with the increase in CCW, and was increased with the increase in CR and temperature. Similarly, the compressive strength was observed to slightly increase at room temperature (27 °C) and the greatest loss in compressive strength was observed between the temperature of 300 and 400 °C. However, highest water absorption, of 2.83%, was observed in the mix containing 20% CR, and 0% CCW, while the lowest water absorption, of 1.68%, was found in the mix with 0% CR, 40% fly ash, and 10% CCW. In conclusion, fly ash is recommended for concrete structures immersed in water, acid, or salt in sulphate- and magnesium-prone areas; conversely, fly ash and CR reduce the resistance of SCC to heat beyond 200 °C.

scholarly journals Influence of formwork liners on fresh, mechanical and durability properties of cast concretes

2021 ◽  
Author(s):  
Sunny R Gurbani
Keyword(s):  
Compressive Strength ◽  
Water Absorption ◽  
Surface Characteristics ◽  
Concrete Surface ◽  
Chloride Penetration ◽  
Freeze Thaw ◽  
Durability Properties ◽  
Salt Scaling ◽  
Chloride Penetration Resistance ◽  
Scaling Resistance

The following study investigates the influence of formwork liners on fresh, mechanical and durability properties of cast concretes. In order to investigate the influence of formwork liners (Weather Shield, Poligloss and Zemdrain) manufactured by Newark Group on concrete properties, column and other specimens were cast in conventional moulds (steel, wood and plastic) with and without formwork liners. As per ASTM Standards Surface characteristics, compressive strength, water absorption, sorptivity, chloride penetration, freeze thaw and salt scaling tests were conducted and results are analyzed. It is found that by the application of formwork liners Zemdrain and Weather Shield, compressive strength, water absorption, sorptivity, chloride penetration resistance, freeze thaw resistance and salt scaling resistance were improved. By the application of Poligloss, concrete surface was found to be homogenous without any visible blow-holes.

scholarly journals Influence of formwork liners on fresh, mechanical and durability properties of cast concretes

2021 ◽  
Author(s):  
Sunny R Gurbani
Keyword(s):  
Compressive Strength ◽  
Water Absorption ◽  
Surface Characteristics ◽  
Concrete Surface ◽  
Chloride Penetration ◽  
Freeze Thaw ◽  
Durability Properties ◽  
Salt Scaling ◽  
Chloride Penetration Resistance ◽  
Scaling Resistance

The following study investigates the influence of formwork liners on fresh, mechanical and durability properties of cast concretes. In order to investigate the influence of formwork liners (Weather Shield, Poligloss and Zemdrain) manufactured by Newark Group on concrete properties, column and other specimens were cast in conventional moulds (steel, wood and plastic) with and without formwork liners. As per ASTM Standards Surface characteristics, compressive strength, water absorption, sorptivity, chloride penetration, freeze thaw and salt scaling tests were conducted and results are analyzed. It is found that by the application of formwork liners Zemdrain and Weather Shield, compressive strength, water absorption, sorptivity, chloride penetration resistance, freeze thaw resistance and salt scaling resistance were improved. By the application of Poligloss, concrete surface was found to be homogenous without any visible blow-holes.

scholarly journals Mechanical and Durability Properties of Green Star Concretes

Buildings ◽  
2018 ◽  
Vol 8 (8) ◽  
pp. 111 ◽  
Author(s):  
Faiz Shaikh
Keyword(s):  
Water Absorption ◽  
Blast Furnace Slag ◽  
Green Building ◽  
Wash Water ◽  
Chloride Permeability ◽  
Coarse Aggregates ◽  
Durability Properties ◽  
Indirect Tensile ◽  
Natural Aggregates ◽  
Furnace Slag

This paper presents mechanical and durability properties of green star concretes. Four series of concretes are considered. The first series is control concrete containing 100% ordinary Portland cement, 100% natural aggregates and fresh water. The other three series of concretes are green star concretes according to Green Building Council Australia (GBCA), which contain blast furnace slag, recycled coarse aggregates and concrete wash water. In all above concretes compressive strength, indirect tensile strength, elastic modulus, water absorption, sorptivity and chloride permeability are measured at 7 and 28 days. Results show that mechanical properties of green star concretes are lower than the control concrete at both ages with significant improvement at 28 days. Similar results are also observed in water absorption, sorptivity and chloride permeability where all measured durability properties are lower in green star concretes compared to control concrete except the higher water absorption in some green star concretes.

scholarly journals Effect of Elevated Temperature on the Compressive Strength and Durability Properties of Crumb Rubber Engineered Cementitious Composite

Materials ◽  
2020 ◽  
Vol 13 (16) ◽  
pp. 3516
Author(s):  
Bashar S. Mohammed ◽  
Lee Yin Yen ◽  
Sani Haruna ◽  
Michael Lim Seng Huat ◽  
Isyaka Abdulkadir ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Elevated Temperature ◽  
Crumb Rubber ◽  
Partial Replacement ◽  
Fine Aggregate ◽  
Cementitious Composite ◽  
Explosive Spalling ◽  
Engineered Cementitious Composite ◽  
Durability Properties ◽  
Strength And Durability

This paper reports the findings of the effect of elevated temperature on the compressive strength and durability properties of crumb rubber engineered cementitious composite (CR-ECC). The CR-ECC has been tested for its compressive strength and chemical resistance test against acid and sulphate attack. Different proportions of crumb rubber (CR) in partial replacement to the fine aggregate and polyvinyl alcohol (PVA) fiber have been utilized from 0 to 5% and 0 to 2%. The experiments were designed based on a central composite design (CCD) technique of response surface methodology (RSM). After 28 days curing, the samples were preconditioned and exposed to high temperatures of 100 °C, 200 °C, 300 °C, 400 °C, 500 °C, 600 °C, 700 °C, 800 °C, 900 °C, and 1000 °C for one hour. Although the residual compressive strength of CR-ECC was negatively affected by elevated temperature, no explosive spalling was noticed for all mixes, even at 1000 °C. Results indicated that CR-ECC experiences slight weight gain and a reduction in strength when exposed to the acidic environment. Due to the reduced permeability, CR-ECC experienced less effect when in sulphate environment. The response models were generated and validated by analysis of variance (ANOVA). The difference between adjusted R-squared and predicted R-squared values for each model was less than 0.2, and they possess at least a 95% level of confidence.

Water Absorption of Wood-Polymer Composites Based on PVC with Partial Replacement of Wood Filler by Mineral One

2019 ◽  
Vol 770 (5) ◽  
pp. 62-66
Author(s):  
A.A. ASKADSKII ◽  
◽  
T.A. MATSEEVICH ◽  
V.I. KONDRASHCHENKO ◽  
◽  
...  
Keyword(s):  
Water Absorption ◽  
Polymer Composites ◽  
Partial Replacement ◽  
Wood Polymer ◽  
Wood Polymer Composites
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