scholarly journals REDUCTION OF EMPLOYMENT OF FORMULA WORKING BY USING LOCAL FILL-ERS AND WASTE OF PRODUCTION

2019 ◽  
Vol 45 (3) ◽  
pp. 221-230
Author(s):  
A. O. Omarov ◽  
K. A. Otsokov
Keyword(s):  
Quartz Sand ◽  
Industrial Waste ◽  
Concrete Mixture ◽  
Foam Concrete ◽  
Foaming Agents ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
The Republic ◽  
Foam Generator ◽  
Turn Over

Objectives.The purpose of this study is to study the increase in turnover of formwork and reduce the complexity of formwork for monolithic foam concrete by regulating its properties through the optimal use of local aggregates of the Republic of Daghestan and industrial waste. In particular, the experimental work used cement grade M500, silica filler - deposits of quartz sand in Kumtorkala district of the Republic of Daghestan with a low module of size, various synthetic foaming agents, perlite sand, ground expanded clay sand (Kizilyurt, Republic of Daghestan),stone crushing roar (Kizilyurt).Method.In the production of foam concrete, a method was used in which foam was prepared in the foam generator, then a solution of cement, filler and water was prepared. Then the foam is mixed with a solution in a foam mixer until a set of appropriate multiplicity. (Multiplicity in this case was defined as the ratio of the volume of the foam concrete mixing solution after mixing to the volume of the solution before mixing). During the study, the water-cement ratio was determined using three types of aggregates (expanded clay sand, quartz sand deposits Kumtorkala district and perlite sand). The turn-over rate of the concrete mixture was determined using the Attard viscometer.Result.The results of studies have shown that with an increase in the water-cement ratio using three types of aggregates (expanded clay sand, quartz sand deposits Kumtorkala district and perlite sand ) will increase the flow rate of the foam concrete mixture.Conclusion.At the same values of the water-cement ratio, the mixture with a filler of perlite sand has the lowest fluidity, which in turn affects the further structure formation of foam concrete and allows you to choose the optimal composition with the desired properties. The possibility of increasing the turnover of artwork and reducing the complexity of artwork work for monolithic foam concrete by regulating its properties due to the optimal use of local aggregates of the Republic of Daghestan and industrial waste.

Replacement of Sand By PVC Pipe Waste in Pavement Blocks

2018 ◽  
Vol 6 (7) ◽  
pp. 282
Author(s):  
Harshit Sangtani ◽  
Bhavini Jain ◽  
K Narayana Shenoy
Keyword(s):  
Compressive Strength ◽  
Specific Gravity ◽  
Water Absorption ◽  
Industrial Waste ◽  
Waste Material ◽  
Large Percentage ◽  
Fine Aggregate ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Pvc Pipe

In the present research an attempt has been made to replace some part of fine aggregate (sand) by an industrial waste, the industrial waste under investigation is produced when the PVC pipes are cut into the desired sizes, it is a very thin flaky substance having a specific gravity of 1.5.This material is very voluminous in nature, so it reduces the workability of concrete if used in large percentage. So this material cannot be used in very large quantities but it can successfully replace sand up to 20 percent when used in pavement blocks. Experimentation was done at a water-cement ratio ranging from 0.43-0.35.Compressive strength of the concrete has been evaluated at 7 days, 14 days 21 days and 28 days. Results of the investigation indicate that compressive strength of the concrete decreases as the percentage of PVC waste material increases.7 day strength of the concrete has varied from 35.55 MPa to 70.01 MPa and 28 day strength has varied from 56.7 MPa to 76 MPa. Water absorption was well within the limits and varied from 4.67% to 7.26% by mass. The results revealed that this waste material can satisfactorily replace sand in small amount also it is a great way to dispose of the waste and hence is a step forward in the quest for a greener concrete.

scholarly journals Effect of Water-Cement Ratio on Pore Structure and Strength of Foam Concrete

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Zhongwei Liu ◽  
Kang Zhao ◽  
Chi Hu ◽  
Yufei Tang
Keyword(s):  
Pore Structure ◽  
Cement Paste ◽  
Water Saturation ◽  
Relative Viscosity ◽  
Foam Concrete ◽  
Analysis Software ◽  
Foaming Agent ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Image Analysis Software

Foam concrete with different dry densities (400, 500, 600, 700, and 800 kg/m3) was prepared from ordinary Portland cement (P.O.42.5R) and vegetable protein foaming agent by adjusting the water-cement ratio through the physical foaming method. The performance of the cement paste adopted, as well as the structure and distribution of air pores, was characterized by a rheometer, scanning electron microscope, vacuum water saturation instrument, and image analysis software. Effects of the water-cement ratio on the relative viscosity of the cement paste, as well as pore structure and strength of the hardened foam concrete, were discussed. Results showed that water-cement ratio can influence the size, distribution, and connectivity of pores in foam concrete. The compressive strength of the foam concrete showed an inverted V-shaped variation law with the increase in water-cement ratio.

Evaluation of Fly Ash on the Basis of Mass Equivalent, Maturity Equivalent and Permeance

1985 ◽  
Vol 65 ◽  
Author(s):  
R. H. Mills
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Portland Cement ◽  
Gas Flow ◽  
Concrete Mixture ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Efficiency Factors ◽  
Gas Tightness

ABSTRACTCombinations of two types of commercially available Fly Ash (FA) and Portland cement (PC) were tested for compressive strength and permeance to gas flow. The cementitious components were combined in the concrete mixture in proportions PC/FA = 100/0, 75/25, 60/40 and 45/55 for a range of water/cement ratio, and equal workability. Strength and maturity efficiency factors were satisfactory for 75/25 and 60/40 blends. Gas tightness was improved at all levels of Fly Ash substitution.

Study on the Physical and Mechanical Performance of Graphite Foamed Cement-Based Material

2015 ◽  
Vol 1089 ◽  
pp. 265-269 ◽  
Author(s):  
Jun Liu ◽  
Xiang Mei Meng ◽  
Hong Tao Mu
Keyword(s):  
Hydrogen Peroxide ◽  
Compressive Strength ◽  
Mechanical Performance ◽  
Sodium Sulfite ◽  
Orthogonal Test ◽  
Dry Density ◽  
Foam Concrete ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Influence Of Water

To figure out the physical and mechanical performance of graphite foam concrete，orthogonal test was applied to ascertain four factors for graphite foamed cement-based material (GFCBM). The influence of water cement ratio, graphite content, hydrogen peroxide content and sodium sulfite content on the dry density, porosity and compressive strength was also discussed. The results show that sodium sulfite has a relatively significant effect on the physical and mechanical performance. The dry density and compressive strength increases first and then decrease with the water cement ratio, adding of hydrogen peroxide and sodium sulfite increasing and increase with adding of the graphite. The trend of porosity is opposite to the dry density and compressive strength. The optimal scheme for this experiment is water cement ratio 0.68, 5% graphite, 8% hydrogen peroxide and 6% sodium sulfate.

scholarly journals Studi Mengenai Pengaruh Faktor Air-Semen dan Nilai Slump Beton Segar terhadap Permeabilitas Beton. (Hal. 33-40)

2019 ◽  
Vol 5 (4) ◽  
pp. 33
Author(s):  
Chandra Budhi Rizky ◽  
Priyanto Saelan
Keyword(s):  
Permeability Coefficient ◽  
Concrete Mixture ◽  
Building Structure ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Concrete Mixtures ◽  
A Value ◽  
The Relationship

Abstrak Permeabilitas beton memiliki peran penting dalam mempertahankan umur suatu struktur bangunan, serta dipengaruhi oleh faktor air-semen, dan porositas beton. Dari suatu nilai faktor air-semen yang sama maka dapat dibuat campuran beton dengan nilai slump yang berbeda. Nilai slump yang berbeda membutuhkan jumlah air yang berbeda hal ini diduga akan mengakibat nilai koefiesien permeabilitas yang lebih tinggi. Penelitian ini dilakukan dengan membuat campuran beton menggunakan cara Dreux Gorrise - ITENAS, untuk faktor granular [G] 0,55; faktor air-semen 0,4; 0,5; dan 0,6; serta slump rencana 30-60 mm dan 60-180 mm. Hasil penelitian ini menunjukan grafik hubungan antara faktor air-semen dan nilai slump dengan nilai koefisien permeabilitas. Hasil dari grafik menunjukan faktor air-semen 0,5 dengan nilai slump 30-60 mm nilai koefisien permeabilitasnya adalah 5,790 x 10-9 m/dtk. Sedangkan untuk faktor air-semen 0,5 dengan nilai slump 60-180 mm nilai koefisien permeabilitasnya adalah 7,674 x 10-9 m/dtk. Kata kunci: permeabilitas beton, porositas beton, nilai slump, faktor air-semen Abstract Permeability of concrete has an important role in maintaining the life of a building structure, also influenced by a water-cement ratio and porosity of the concrete. From a value of the same water-cement ratio, concrete mixtures can be made with different slump values. Different slump values require different amounts of water, this is thought to result in higher permeability coefficient values. This research was carried out by making a concrete mixture using the Dreux Gorrise - ITENAS method, for granular factors [G] 0.55, water-cement ratio 0.4, 0.5, and 0.6, and slump plans 30-60 mm and 60-180 mm. The results of this study show a graph of the relationship between the water-cement ratio and slump value with the permeability coefficient value. The results of the graph show a water-cement factor of 0.5 with a slump value of 30-60 mm the value of the permeability coefficient is 5.790 x 10-9 m/sec. While for the water-cement factor 0.5 with a slump value of 60-180 mm the value of the permeability coefficient is 7.674 x 10-9 m/sec. Keywords: permeability of concrete, porosity of concrete, slump value , water-cement ratio

Preparation and Characteristics of Light Foam Cement

2017 ◽  
Vol 727 ◽  
pp. 1029-1034
Author(s):  
Yan Zhang ◽  
Hui Chao Chu ◽  
Hui Li ◽  
Chun Yu Hua ◽  
Xian Jun Lyu
Keyword(s):  
Ordinary Portland Cement ◽  
Raw Materials ◽  
High Strength ◽  
Polypropylene Fibers ◽  
Key Factors ◽  
Foaming Agents ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Heat Preservation

This present paper took ordinary Portland cement as main raw materials to prepare foam cement with properties, such as lightweight, high strength, and heat preservation, by the method of chemical foaming. The authors discussed the effects on the properties by key factors like water/cement ratio, foaming agents, foam stabilizers, accelerator and fibers of foam cement objects. Taken all the results show that in the condition that water/cement ratio of 0.48, foaming agents, foam stabilizers, accelerators and polypropylene fibers were adopted accounting for the quality of cement of 4.8%, 0.6%, 0.25% and 0.4% respectively, the characteristics of prepared formed cement samples could conform to the requirement of standard of JC/T266 formed cement.

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