MIXING PROCESSES AND EQUIPMENT. CONSTRUCTION MIXTURES AND MIXTURES FOR MANUFACTURING CONSTRUCTION MATERIALS. LECTURE 9

2021 ◽  
pp. 52-59
Author(s):  
A. I. Nizhegorodov
Keyword(s):  
Production Technology ◽  
Construction Materials ◽  
Working Process ◽  
Road Vehicles ◽  
Mixing Processes ◽  
Concrete Mixtures ◽  
Equipment Construction ◽  
Clay Suspensions ◽  
Energy Aspects

The article presents materials of Lecture 9 Theory of carrying and lifting, construction and road vehicles and equipment, which describes mixing machines, concrete mixtures, their dosage, quality and homogeneity. The process of concrete mixing and energy aspects of its production are described. The data on mixers used for producing mortars and clay suspensions are presented. The design of a special mixer for producing polystyrene-silicate mineralized granules and the production technology for hollow silicate spheres based on the working process of a special mixer are described.

Influence of the Supplementary Cementitious Materials on the Dynamic Properties of Concrete

2014 ◽  
Vol 660 ◽  
pp. 162-167
Author(s):  
Elbachir Elbahi ◽  
Sidi Mohammed El Amine Boukli Hacene
Keyword(s):  
Dynamic Modulus ◽  
Dynamic Properties ◽  
Construction Materials ◽  
Cementitious Materials ◽  
Supplementary Cementitious Materials ◽  
Natural Pozzolan ◽  
Frequency Method ◽  
Concrete Mixtures ◽  
And Control ◽  
Non Destructive

The resonance frequency method is one of many non-destructive tests which allow us to evaluate construction materials. It was used to determine the dynamic properties of concrete, required in structures design and control, also considered as the key elements for materials dynamic. In this study, we chose a non-destructive approach to quantify-in laboratory-, the influence of adding “crushed limestone” and “natural pozzolan” on local concrete’s dynamic characteristics. However, several concrete mixtures have been prepared with limestone aggregates. The experimental used plan, allowed us to determine the dynamic modulus of elasticity, the dynamic modulus of rigidity of different formulated concretes.

scholarly journals Performance of Beting Bamboo (Gigantochloa Levis) as Partial Replacement for Coarse Aggregate in Concrete

2021 ◽  
Vol 920 (1) ◽  
pp. 012014
Author(s):  
R M K Tahara ◽  
M H Hasnan ◽  
N Z N Azizan
Keyword(s):  
Coarse Aggregate ◽  
Construction Materials ◽  
Environmental Issues ◽  
Cementitious Materials ◽  
Natural Fibre ◽  
Supplementary Cementitious Materials ◽  
Partial Replacement ◽  
Concrete Mixtures ◽  
Concrete Production ◽  
Alternative Materials

Abstract Conventional construction materials are considered as exploitation to natural resources. Thus, numerous alternative materials using natural or waste materials are proposed for concrete production as a response for greener, renewable and biodegradable environments with regard to sustainability. Natural fibre such as bamboo has been rapidly proposed for many applications especially for concrete production in construction. In order to tackle the environmental issues and focusing on sustainability, natural fibre of Beting bamboo is proposed for partial replacement used as supplementary cementitious materials. Current study investigates the partial replacement of coarse aggregate with Beting bamboo in concrete mixtures. The outcome of the study discovers that through the mix design, replacing 5% by weight of Beting bamboo is an ideal % to achieve concrete mixture for structural and nonstructural application. However, with the increase % of Beting bamboo for partial replacement, the strength of the concrete gradually decreased.

THE CLEANABILITY OF MATERIALS IN CONTACT WITH DAIRY PRODUCTS1

1958 ◽  
Vol 21 (3) ◽  
pp. 68-72 ◽  
Author(s):  
G. L. Hays ◽  
J. D. Burroughs ◽  
D. H. Johns
Keyword(s):  
Stainless Steel ◽  
Dairy Products ◽  
Construction Materials ◽  
Complete Removal ◽  
Radioactive Tracer ◽  
E Coli ◽  
Tracer Techniques ◽  
Equipment Construction ◽  
Dairy Equipment

The removal of air dried soil (dairy products contaminated with E. coli) from the surface of disks of several possible dairy equipment construction materials was determined by both radioactive tracer techniques and bacteriological methods. Both methods showed that cleaning the disks with any of the four types of cleaning compounds effected essentially complete removal of the contaminating soil from the surface of the molded plastics and various finishes of stainless steel which were tested.

scholarly journals The effect of the addition of polypropylene fibres on improvement on concrete quality

2018 ◽  
Vol 183 ◽  
pp. 02011 ◽  
Author(s):  
Alina Pietrzak ◽  
Małgorzata Ulewicz
Keyword(s):  
Urban Areas ◽  
Construction Materials ◽  
Polymer Modification ◽  
Freezing And Thawing ◽  
Polypropylene Fibres ◽  
Concrete Mixtures ◽  
Destructive Action ◽  
Total Freedom ◽  
Constant Growth

Concrete serves as one of the most important construction materials, which thanks to its resistance and durability, gives total freedom in using it in building industry, and by extension in defining urban areas. Despite numerous advantages (ease of handling, high compressive strength, low production cost, heat resistance) it also has many disadvantages, including low tensile strength as well as sensitivity to destructive action of chemical agents. A constant growth in expectations concerning increasing the quality of concrete led to its polymer modification, whose aim was to eliminate above-mentioned disadvantages. The scope of the present research involved designing and making of concrete mixtures modified by 19, 30, 40 and 60 mm long polypropylene fibres. For the experiment the authors used: Portland cement CEM I 42.5R, sand, gravel aggregate of the 2-8 and 8-16 fractions, water, Master Pozzolith STD plasticizer and polypropylene fibres of various length. The authors made 4 series of concrete samples modified by fibres, for which the following factors have been assigned: compression strength after 7, 28 and 56 days of maturing as well as absorptivity, volumetric density and frost resistance after 100 cycles of freezing and thawing.

USING CERAMIC WASTES IN CONCRETE MANUFACTURING FOR SUSTAINABLE CONSTRUCTION MATERIALS AS COARSE AGGREGATE REPLACEMENT

2020 ◽  
Vol 7 (2) ◽  
Author(s):  
Mohamed Tarek El-Hawary ◽  
Amr Maher Elnemr ◽  
Nagy Fouad Hanna
Keyword(s):  
Coarse Aggregate ◽  
Construction Materials ◽  
Mix Design ◽  
Sustainable Construction ◽  
Fine Aggregate ◽  
Conventional Concrete ◽  
Ceramic Waste ◽  
Concrete Mix Design ◽  
Concrete Mixtures ◽  
Waste Concrete

About 30% of the ceramic production all over the world considered as waste. This huge amount of ceramic waste can be recycled in the construction industry, especially in concrete mix design, which is the main scope of this research. Ceramic wastes could provide many advantages rather than sustainability. It is considered economical and can replace cement, coarse aggregate, and fine aggregate, such as sand. In this study, several concrete mixtures were designed according to the ACI standards to assess the ceramic waste concrete for fresh and hardened properties in terms of slump, concrete compressive, splitting tensile and flexural strengths. Six mixes included with 0%, 10%, 20%, 30%, 40% and 50% replacement of coarse aggregate by crushed ceramic waste. By comparing the results between ceramic waste concrete and conventional concrete specimens, the optimum mix design was found to be at 30%-coarse aggregate replacement. Scanning electron microscope tests performed on the concrete specimens to examine the bond between the particles, the porosity, and the elementary composition of the specimens. The percentage of savings in cost estimated when using the optimum mix design (30% coarse aggregate replacement) was about a 30% reduction in the construction cost per the Egyptian market.

scholarly journals Study the Effect of Using Ceramic Waste Powder as Partial Replacement for Cement on Concrete Properties

2021 ◽  
Author(s):  
Moatasim Attaelmanan ◽  
Mahgoub Elhaj Mahgoub Kambal ◽  
Mohammed Izzeldeen Mansour
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Construction Materials ◽  
Partial Replacement ◽  
Strength Development ◽  
Hardened Concrete ◽  
Ceramic Waste ◽  
Research Areas ◽  
Industrial Sectors ◽  
Concrete Mixtures

Ceramic waste is one of the most active research areas that encompass a number of disciplines including civil engineering and construction materials. Ceramic waste powder is settled by sedimentation and then dumped away which leads to environmental pollution, in addition to forming dust in summer and threatening both agriculture and public health. Therefore, utilization of the ceramic waste powder in various industrial sectors especially the construction, agriculture, glass and paper industries would help to protect the environment. It is most essential to develop eco-friendly concrete from ceramic waste. In this research replacing the (OPC) cement by ceramic waste powder has been studied accordingly in the range of (0, 10, 15, and 20) % by weight of M-30 grade concrete. Concrete mixtures were produced, tested and compared in terms of compressive and tensile strength to the conventional mixture. These tests were carried out to evaluate the mechanical properties for 7 and 28 days. As a result, the CWP cement concretes decreased the workability retention. The values of average hardened concrete density for concrete mixes with CWP cement are higher than the reference mix in 7 days, but lower than the reference mix in 28 days. The maximum value of compressive strengths at 7 and 28 days and tensile strength was achieved at about 5% CWP concrete mix. CWP slowed the compressive strength development especially at early ages. All mixtures with CWP showed good strength development at 28 days. It was observed that all CWP replacement ratios achieved higher compressive strength than characteristic compressive strength which is equal to 30 N/mm2 in 28 days, except the 20% ratio gives 29.72 N/mm2. Test results showed that CWP has potential to be used as an ingredient in concrete mixtures to partially replacing cement. The study showed that concrete mixtures with ceramic waste powder (CWP) had variable performance of the measured properties depending on the replacement level used.

scholarly journals DESIGN AND CALCULATION OF ROAD SURFACE BY METHOD OF STRUCTURAL NUMBERS

2020 ◽  
pp. 25-30
Author(s):  
N. Gorshkova ◽  
D. Aleksandrov
Keyword(s):  
Construction Materials ◽  
Physical And Mechanical Properties ◽  
Road Construction ◽  
Ease Of Use ◽  
Road Surface ◽  
Simple Method ◽  
Concrete Mixtures ◽  
Road Surfaces ◽  
Complex Engineering ◽  
Main Components

Road surface is one of the main components of highways, its condition ensures the safety and speed of traffic. Modern road surface is a complex engineering structure: it consists of layers of road construction materials laid in stages, which have various physical and mechanical properties. These properties are taken into account to ensure the safe movement of vehicles at any time of the year at the estimated speed, while preventing accidents and reducing traffic convenience. The method of structural numbers is one of the methods for calculating roadways. The possibility of its application for the design and calculation of road surface is analyzed. The article shows the possibility of using this rather simple method used in many countries, using a specific example. Since Russia is actively switching to the design of asphalt-concrete mixtures using the Superpave method, which improves the performance of road surfaces, this method has advantages in the design and calculation of road coverings, consisting in ease of use.

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