scholarly journals Evaluation of the Effects of Surface Treatment Methods on the Properties of Coral Aggregate and Concrete

Materials ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 6784
Author(s):  
Jinming Liu ◽  
Boyu Ju ◽  
Wei Xie ◽  
Ting Zhou ◽  
Haiying Xiao ◽  
...  
Keyword(s):  
Mechanical Performance ◽  
Low Cost ◽  
Concrete Surface ◽  
Raw Material ◽  
Lower Strength ◽  
Load Bearing Capacity ◽  
Granulated Blast Furnace Slag ◽  
Aggregate Effect ◽  
Compound Modification ◽  
Furnace Slag

Coral concrete has low cost and convenient materials, making it an excellent raw material for processing. However, its lower strength limits the application of coral concrete. Surface modification is expected to increase the properties of porous coral concrete. In this study, single and compound modification treatments were applied to the surface of a coral aggregate to improve its properties for promoting the mechanical performance of coral concrete. The results showed that the micro-aggregate effect and pozzolanic activity of granulated blast furnace slag (GBFS) and the permeability and polycondensation of sodium silicate (SS) could be mutually promoted. The GBFS and SS could effectively fill the pores of the coral aggregate, enhancing the properties of the aggregate, such as density and load-bearing capacity, and reducing the water absorption and crushing index by more than 50%. GBFS and SS could intensify and accelerate the hydration of cement, and generate a large number of hard hydration products at the interfacial transition zone (ITZ), which could strengthen the bonding between the aggregate and mortar, improving the strength of the ITZ. The compressive strength of the coral concrete was significantly increased.

scholarly journals Effects of epoxy resin on ground-granulated blast furnace slag stabilized marine sediments

RSC Advances ◽  
2017 ◽  
Vol 7 (58) ◽  
pp. 36460-36472 ◽  
Author(s):  
Jiapei Du ◽  
Yuhuan Bu ◽  
Shenglai Guo ◽  
Leiju Tian ◽  
Zhonghou Shen
Keyword(s):  
Blast Furnace ◽  
Epoxy Resin ◽  
Marine Sediments ◽  
Blast Furnace Slag ◽  
Mechanical Performance ◽  
Environmentally Friendly ◽  
Granulated Blast Furnace Slag ◽  
Furnace Slag

In this study, an environmentally friendly epoxy resin is mixed with ground-granulated blast furnace slag (GGBS) for use as a stabilizer to enhance mechanical performance and leaching resistance properties of marine sediments.

Alkaline Activation of Kaolinitic Soils for the Production of Special Binders

2005 ◽  
Vol 498-499 ◽  
pp. 394-400
Author(s):  
D.P. Dias ◽  
Amilcar Soares ◽  
C.E. Viana ◽  
J.C. Soares ◽  
P.H.B. Azevedo
Keyword(s):  
Portland Cement ◽  
Mechanical Strength ◽  
Raw Material ◽  
Experimental Program ◽  
Alkaline Activation ◽  
Granulated Blast Furnace Slag ◽  
Suitable Combination ◽  
Furnace Slag ◽  
Grinding Time ◽  
Alkali Activated

The alkaline activation of Portland cement based materials, ground granulated blast furnace slag and pozzolans has been accomplished with success since the decade of 40, in several countries. The practicability of the use of the alkalis opens new opportunities for the production of special binders with properties different from those presented by the ordinary Portland cement. Besides the chemical composition, the mechanical strength of these alkali-activated materials depends a lot on the reactivity of the raw material, property that is influenced mainly by the specific surface area and crystalline degree of the raw material. Thus, an experimental program was carried out aiming at evaluating the influence of these variables in the compressive strength, at 3, 7 and 28 days of age, for mortars manufactured using alkaline activation of kaolinitic soils. The results have shown that the most suitable combination, in terms of mechanical strength and economy of energy, was the mortar manufactured with soil receiving a ½ hour grinding time and calcined at 650oC during four hours.

scholarly journals Effects of Composition Type and Activator on Fly Ash-Based Alkali Activated Materials

Polymers ◽  
2021 ◽  
Vol 14 (1) ◽  
pp. 63
Author(s):  
Chan-Yi Lin ◽  
Tai-An Chen
Keyword(s):  
Fly Ash ◽  
Sodium Hydroxide ◽  
Blast Furnace Slag ◽  
Raw Material ◽  
Granulated Blast Furnace Slag ◽  
Different Types ◽  
Short And Long Term ◽  
Furnace Slag ◽  
Alkali Activated

The compressive strengths of fly ash-based alkali-activated materials (AAM), produced using various activators of only sodium hydroxide, were measured. Fly ash-based AAM specimens, produced by mixing different kinds of fly ash and ground granulated blast-furnace slag (GGBFs) with an activator containing only sodium hydroxide, were cured at ambient temperature, and then placed in air for different numbers of days. The short- and long-term compressive strengths and shrinkage of fly ash-based AAM were measured and compared to one another. The effects of type of fly ash, alkali-equivalent content, GGBFs replace percentage, and ages on the compressive strengths and shrinkage of fly ash-based AAM were investigated. Even when different fly ash was used as the raw material for AAM, a similar compressive strength can be achieved by alkali-equivalent content, GGBFs replaces percentage. However, the performance of shrinkage due to different types of fly ash differed significantly.

FABRICATION OF UNFIRED BRICKS FROM INDUSTRIAL SCHEDULED WASTE (WWTS)

2016 ◽  
Vol 78 (5-2) ◽  
Author(s):  
Umul Masikin Othman Othman ◽  
Mohamad Nidzam Rahmat
Keyword(s):  
Blast Furnace Slag ◽  
Low Cost ◽  
Hydrated Lime ◽  
Point Of View ◽  
Manufacturing Industries ◽  
Low Carbon ◽  
Secondary Products ◽  
Granulated Blast Furnace Slag ◽  
Furnace Slag ◽  
Leaching Procedure

Manufacturing industries produce wastes or secondary products, in which it has a direct impact to the environment. The storage of such wastes remains at the disposal would pollute the air, water resource and agricultural fields. There is a huge opportunity for recycling and it uses large quantities of wastes to minimize the environmental impact. This paper investigates the effect of utilization Wastewater Treatment sludge (WWTs) blended with Laterite Clay (LC) at 50:50 ratio to produce unfired bricks. These target materials were stabilized using Hydrated Lime (HL), Portland cement (PC) on its own and combination of Ground Granulated Blast-furnace Slag (GGBS), HL:GGBS and PC:GGBS both (50:50 and 70:30 ratio) at 10%, 20% and 30% stabilizer dosage. Compressive strength, flexural strength, thermal conductivity and toxicity characteristic leaching procedure (TCLP) test were conducted and compared with the relevant standards. It was found that it is feasible to utilize WWTs as unfired bricks from the economical and environmental point of view as it will conserve natural resource, protect the environment from waste disposal, and produce a low cost, low carbon construction components.

scholarly journals Durability Experiences on the Traditional and SCM Founded Blended Concrete

2021 ◽  
pp. 1-4
Author(s):  
Eti Tirumala Chakrapani ◽  
◽  
A M N Kashyap ◽  
G Anjaneyulu ◽  
M R Manikanta ◽  
...  
Keyword(s):  
Fly Ash ◽  
Environmental Sustainability ◽  
Blast Furnace Slag ◽  
Construction Material ◽  
Industrial Wastes ◽  
Raw Material ◽  
Granulated Blast Furnace Slag ◽  
Chemical Admixtures ◽  
Cement Manufacture ◽  
Furnace Slag

Concrete might be the maximum substantially used construction material in the global with approximately six billion tones being produced each year. It is best subsequent to water in phrases of in keeping with-capita consumption. However, environmental sustainability is at stake both in terms of damage due to the extraction of raw material and CO2 emission all through cement manufacture. This brought pressures on researchers for the discount of cement intake by means of partial substitute of cement by using supplementary materials. These materials may be obviously happening, industrial wastes or by way of-products that are less energy extensive. Fly ash and Ground Granulated Burnt Slag (GGBS) are selected specifically based totally on the standards of fee and their long lasting qualities., Not best this, Environmental pollution also can be decreased to a point due to the fact the emission of dangerous gases like carbon monoxide & carbon dioxide are very restricted. These substances (referred to as pozzalonas) when combined with calcium hydroxide, reveals cementitious compositions. Most commonly used pozzalonas are fly ash, silica fume, met kaolin, ground granulated blast furnace slag (GGBS). This wishes to look at the admixtures performance whilst combined with concrete so as to ensure a discounted existence cycle fee. The present research consists of three phases and reports the specializes in investigating characteristics of M35grade concrete .In the 1st phase the behavior of standard and SCM concrete (7.5%FA and 7.5%GGBS) of M35 grade specimens with different percentages of chemical admixtures curing with acids such as HCL. 2nd phase the same grade of specimens curing with Alkaline such as NaOH and in the 3rd phase the same grade of specimens curing with sulphate solution MgSO4 and finally assess the losses of mechanical properties and durability considerations of the concrete due to these conditions were reported.

Stabilised Ceramic Dust as Potential Sustainable Construction Components

2015 ◽  
Vol 1113 ◽  
pp. 168-174
Author(s):  
Muhammad Redzwan Raffe ◽  
Mohamad Nidzam Rahmat ◽  
Norsalisma Ismail
Keyword(s):  
Compressive Strength ◽  
Sustainable Use ◽  
Hydrated Lime ◽  
Raw Material ◽  
Sustainable Construction ◽  
Partial Substitution ◽  
Granulated Blast Furnace Slag ◽  
Paper Sludge Ash ◽  
Sludge Ash ◽  
Furnace Slag

Ceramic is mainly being used as raw material in the production of building finishes. The production processes of this material generated a great amount of waste and by-product in the form of dust, broken tiles and sludge which will lead to environment pollution. The aim of this study is to investigate the potential utilisation of ceramic dust as alternative raw material in the production of sustainable construction components. Target materials of ceramic dust (CD) and laterite clay (LC) on its own or combination of both were stabilised with Portland cement (PC) and hydrated lime (HL) on its own or combination with ground granulated blast furnace slag (GGBS) by-product from steel industry. A blended binder of GGBS and waste paper sludge ash (WPSA) was also used to develop 100% sustainable stabiliser to stabilise the target materials. Compacted cylindrical specimens of 50 mm Ø and 100 mm height were fabricated at 20% dosage of binders concentration and moist cured for 7, 28, and 60 days before tested for compressive strength and water absorption. The results obtained show that stabilised CD with partial substitution of HL and PC with GGBS as stabilisers gave higher compressive strength and has potential to be used in the production of sustainable construction components. This suggests a solution towards a greener future and sustainable use of environmental friendly construction components.

Effect of the Treatments of the Surface on Mechanical Performance of Concrete Containing Chemical Admixtures

2022 ◽  
Author(s):  
Catherine Campbell ◽  
Gareth Jackson ◽  
Mohammed Sonebi ◽  
Su Taylor
Keyword(s):  
Abrasion Resistance ◽  
Blast Furnace Slag ◽  
Mechanical Performance ◽  
The Other ◽  
Limestone Powder ◽  
Surface Protection ◽  
Granulated Blast Furnace Slag ◽  
Chemical Admixtures ◽  
Slip Resistance ◽  
Furnace Slag

The aim of this paper is to investigate two different concrete mixes, one with Limestone Powder (LSP) and the other with Ground Granulated Blast-Furnace Slag (GGBS), both mixes containing superplasticizer, in order to analyse their compressive strengths at 7 and 28 days, their abrasion resistance and slip resistance. The two mixes are treated with two different surface protection finishers, applied on the surface after the concrete has cured and analysis of how these finishers affect the abrasion resistance and slip resistance of the concrete is discussed.

scholarly journals Mechanical Performance and Durability Evaluation of Sandstone Concrete

2020 ◽  
Vol 2020 ◽  
pp. 1-10 ◽  
Author(s):  
Fayong Yang ◽  
Haibin Li ◽  
Guijuan Zhao ◽  
Ping Guo ◽  
Wenbo Li
Keyword(s):  
Compressive Strength ◽  
Crack Resistance ◽  
Mineral Composition ◽  
Frost Resistance ◽  
Mechanical Performance ◽  
Low Cost ◽  
Mass Loss Rate ◽  
Raw Material ◽  
Inspection Time ◽  
Cement Stabilized Base

Enlarging local raw material utilization and reducing project costs is a new trend in the construction field. Under this background, sandstone was utilized in a cement-stabilized base in this study. The mineral composition of sandstone and the proportion of each mineral composition in the parent rock were analyzed using X-ray diffraction. To verify its feasibility, sandstone, syenite, marble, and basalt aggregates were selected to test the mechanical properties and road performance of the four aggregate concretes at 7, 28, 90, and 180 days. The test results showed that although the sandstone slump was the lowest at 60, the workability met the requirement. Compressive strength, tensile elasticity modulus, and axial tensile strength of concrete increased with age in all the concrete specimens, and the strength at each inspection time of sandstone was equivalent to that of marble, lower than that of basalt but higher than that of syenite. The early compressive strength of sandstone concrete is slightly lower than the compressive strength of marble concrete, and the 7 d and 28 d strengths were lower than 14% and 11%, respectively, but their 90 d and 180 d compressive strengths were the same. The crack resistance and frost resistance of sandstone were slightly inferior to those of syenite but better than those of basalt and marble. After 300 freeze-thaw cycles of the four aggregate concretes, the mass-loss rate of the test specimens was less than 5%, indicating that the frost resistance can meet the requirements. The various technical indexes of sandstone mixture could meet the current industry standards, and crack resistance, frost resistance, and fatigue resistance were good, which verified the feasibility of using sandstone for cement-stabilized base and provided a low-cost alternative for road construction.

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