Ceramic Concrete Research Articles

Basic properties of concrete incorporating recycled ceramic aggregate and ultra-fine sand

Recycled ceramic mixed sand (RCMS) was obtained by partially replacing ultra-fine sand with recycled ceramic coarse sand (RCCS). The effects of RCCS replacement rate on the apparent density, workability, compressive strength and splitting tensile strength of recycled ceramic concrete (RCC) were investigated. In addition, the relationship between the water-cement ratio and compressive strength of RCC was also studied. The experimental results indicate that the reusing of recycled ceramic aggregate can improve the cohesiveness and water retentiveness of fresh concrete and benefit the mechanical properties development. When the RCCS replacement rate is not less than 40%, the mechanical properties of RCC are superior to those of the reference concrete. Moreover, when recycled ceramic medium sand was completely used as fine aggregate, the maximum increase in both compressive strength and splitting tensile strength were obtained, comparing with those of reference concrete, the increment ratio was 19.85% and 32.73%, respectively. The microscopic analysis shows that the using of recycled ceramic aggregate can meliorate distinctly the structure of the interfacial transition zone (ITZ) and increase the compaction degree of cement paste. Furthermore, an expression of the compressive strength of RCC and the cement-water ratio is regressed and gains a good linear relativity. It is an effective way to recycle waste ceramic, and the consumption of recycled ceramic aggregate could reach from 26.9% to 47.6% of the total weight of aggregate in producing concrete.

Ceramic Objects for Dispensing Molten Aluminum Alloys

Preparation of special aluminum alloys and refractories conforming to them are considered from the point of view of physicochemical processes and aluminum metallurgy mechanisms, functional capacity of melting and casting equipment and a ceramic lining, making it possible to control casting structural and chemical parameters during their preparation. Compositions and production solutions are developed for preparing shaped refractory lining objects based on cement-free ceramic concretes.

About Research of Ramic Concrete Strength and Thermal Performance

The sludge, dredging silt and other materials prepared by mixing the ceramic, studying the effects of different sludge ratio, sintering temperature, the amount of excess sludge moisture content on ceramic, pile density, ignition loss rate. Produced ceramic concrete specimens tested by experiment and standard ceramic concrete specimens concrete specimen strength and thermal conductivity. Test specimen obtained ceramic concrete compressive strength of 13.57MPa, mixing concrete block compressive strength of 13.96MPa; gravel concrete specimens of thermal conductivity 0.394, ceramic concrete specimens thermal conductivity of 0.387. The results show that adding the ceramic concrete, ceramic concrete strength of certain decline, but the performance is enhanced thermal insulation, thermal insulation properties can greatly enhance it.

Bond Properties of Ceramic Concrete Reinforced by Bamboo Bar

Bond properties of ceramic concrete reinforced by bamboo bar were investigated based on pull-out tests. The influences of strength grade of ceramic concrete, material type, bond length, side length and notch spacing of bamboo bar on the bond strength between the bamboo bars and ceramic concrete were studied. The results show that the bond failure mode of ceramic concrete reinforced by bamboo bar without notch is majorly pulling-out failure, however, ceramic concrete reinforced by restructured bamboo (RB) bar with notch appears shear failure mode. The ultimate bond strength of ceramic concrete reinforced by RB bars is higher than that of ceramic concrete reinforced by laminated bamboo (LB) bar, which is close to that of ceramic concrete reinforced by plastic bars,but lower than that of ceramic concrete reinforced by steel bars under the same condition. When the notch spacing is 15 mm, the bond strength of ceramic concrete reinforced by RB bars is the highest. The conclusions can be usable for the the constitutive relationship of ceramic bamboo-reinforced concrete.

Mechanical properties of glass fiber reinforced ceramic concrete

This paper reports on tests conducted to establish the influence of chopped glass fibers on the mechanical and rheological properties of ceramic concrete produced using a phosphate cement binder. Two different ceramic concrete matrices were studied, containing either sand or lightweight expanded clay aggregates. Fiber volume fractions between 0% and 2% were examined. The addition of glass fibers into ceramic concrete had little influence on the compressive strength and modulus of elasticity but resulted in significant increases in flexural strength and direct shear strength, regardless of the matrix type or fiber length. The results also showed that the compression, the flexure and the shear toughness all increased with an increase in the fiber content, while the workability decreased with an increase in fiber content. Overall, the results indicate that glass fiber reinforced ceramic concretes can be produced with workability and mechanical properties that are suitable for application in building elements.

Design and Application of Lightweight Steel Residential House

This paper presented a design of a steel residential house. H-shaped steel was chosen as the beam and column of the steel frame. End-plate joints and welding node joints were used to connect each other so that the structure could be constructed rapidly and conveniently. PK prestressed concrete composite slab was chosen as the floor and roof slab. PK slab could be produced in factory and dont need formwork assembling and setting and could reduce the amount of work on-site, and could shorten the period of construction effectively. Composite panels with steel truss reinforced concrete and bamboo reinforced ceramic concrete were chosen as exterior walls. Compared with aerated concrete block wall with external insulation, composite panels had the advantages such as lightweight, energy saving, rapid installation, less slit and small thickness of wallboard and better seismic behavior. Application of the technology made the steel residential house a lightweight, energy saving and rapid construction house.

Composite binder for refractory concretes based on magnesia thixotropic mixes

Composite binder is prepared in the system Na2O–MgO–SiO2. Due to its production advantages it may serve as a basis for manufacturing high quality ceramic concretes based on periclase that may be used successfully for lining heating units in metallurgy and the building material industry.

Thinning, plastifying, and strengthening additives as effective modifiers in HCBS and ceramic concrete technology

The efficiency of using thinning (deflocculating), plastifying, and strengthening additions in HCBS technology, ceramic concretes, and new unmolded refractories, is demonstrated. Quantitative criteria are proposed for evaluating addition efficiency. In the field of preparing the materials in question the practice of using composite (combined) modifying (deflocculating) additions that have a high synergetic effect predominates. They are distinguished by an electrosteric stabilization mechanism. Solutions or powders, used in the preparation of unfired materials, strengthened by a UKhAKS-mechanism (strengthening by chemical activation of contact bonds), are a special group of additions.

AES Chemunex ADIAFOOD Detection System for Listeria spp. Environmental Sample Testing

The ADIAFOOD Detection System for the detection of Listeria species from environmental surfaces is based on real-time PCR technology and allows rapid pathogen detection within 21 h. The strength of the ADIAFOOD technology resides in its ability to rapidly and accurately detect Listeria species present on surfaces, such as stainless steel, plastic, ceramic, and sealed concrete. The technology is easy to use and versatile.

The Experimental Research on the Effect of Age on Bond Behavior between Deformed Bar and Shale Ceramic Concrete

In this paper, the effect of age on bond behavior between deformed bar and shale ceramic concrete was analyzed by four groups of pull-out tests with different age. And three reinforced concrete pull-out tests used for comparative analysis were prepared at the same time. We obtained a series of experimental data and based on these data a more accurate formula was summed up. This conclusion is important for further study on bonding properties of ceramic concrete and has a high value in guiding the actual construction.

Aluminosilicate Refractories Based on High-Alumina HCBS.

Ceramic concrete specimens are prepared based on HCBS of mullite-silica composition (58% Al2O3) and fillers of similar and chamotte compositions, having markedly better properties than for traditional refractories with the same Al2O3 content. An ultimate strength in compression of 150 – 250 MPa with porosity of 6 – 11%, and a temperature for deformation under load T g of 1540 and 1460 MPa are obtained correspondingly for ceramic concrete specimens with an Al2O3 content of 58 and 42%. With respect to T g, mullite-silica ceramic concretes (58% Al2O3) correspond to traditional mullite (62 – 72% Al2O3), chamotte (42% Al2O3) and mullite-silica (45 – 62% Al2O3) refractories.

Study on the Effect of Bond-Anchoring Factor on Bond Behavior between Deformed Bar and Shale Ceramic Concrete

In this paper, the effect of bond-anchoring factor on bond behavior between deformed bar and shale ceramic concrete was analyzed by four groups of pull-out tests with different anchorage length. And three reinforced concrete pull-out tests used for comparative analysis were prepared at the same time. We obtained a series of experimental data and based on these data .A more accurate formula was summed up. This formula has a high value in guiding the practical project to choose the anchorage length.

High-alumina composite concretes and coatings based on modified phosphate binder suspensions

Coatings and materials based on aluminum phosphate suspensions are studied that have high strength in a raw state and are suitable for carrying out combined firing of a refractory and coating. An aluminum phosphate binder provides preparation of high physicomechanical properties in the firing temperature range. Use of traditional mixes with a protective aluminum phosphate coatings, and also ceramic concrete based on this binder provide increased material corrosion resistance, and consequently an increase in object operating life and period between repairs for metallurgical and glass melting units.

Mechanical properties of lightweight ceramic concrete

Concrete produced using a magnesium phosphate binder can exhibit faster strength gain and result in lower overall environmental impacts than concretes produced with Portland cement binders. This paper reports a study to develop and characterize the rheological and mechanical properties of lightweight ceramic concretes (LWCC) that use a magnesium potassium phosphate binder. The aggregate type and the overall mix composition were primary variables in the study. Aggregate types included expanded clay, expanded slate, and expanded shale. Crushed bottom ash aggregate from a local coal-fired thermal generating station was also used. The aggregates of a given material varied by size fraction and by surface characteristics in some cases. The test results showed that increases in the water/binder ratio increased the slump flow but had negligible influence on the setting time. The compressive strength and density of the LWCCs both decreased with increases in the aggregate/binder mass ratio and the water/binder ratio, regardless of the type of lightweight aggregate. The 28 day compressive strength and density ranged from 17 to 36 MPa and 1600 to 1870 kg/m3 respectively. Regardless of the aggregate type, increasing the water/binder ratio also reduced the elastic modulus, modulus of rupture and direct shear strengths. Relationships were developed to directly relate these mechanical properties to the corresponding compressive strengths. The results indicate that LWCCs using a magnesium phosphate binder and lightweight aggregates can be formulated with rheological and mechanical properties suitable for structural applications.

Experimental Study on Flexural Bearing Capacity of Reinforced Ceramsite Concrete Beam

In order to investigate the flexural bearing capacity of reinforced ceramic concrete beams, static loading experiments were carried out. 10 ceramic reinforced concrete beams and 2 non-reinforced ceramic concrete with different steel ratios, cover thicknesses and bar diameters were fabricated. The gauges of concrete was arraged on the surfaces of section in mid-span and and steel gauges was arraged on the surfaces of steel bars. The loading device was consisted of a 200kN hydraulic jack, a distributive girder and reaction frame while the dial indicators was arraged in supports and mid-span. The strain of concrete and steel bar in different loading along with the crack,yield and utimate of load were recorded .It found that the stress-strain law, crack extension regularity , failure modes of specimens was similar to the ordinary concrete beams and the current procedures formulas about flexural bearing capacity is reliability. It also found that both ceramic aggregate and cement mortar were crushed for the perfectly bonding of the interface and the strength of aggregate was to be fully utilized.

HCBS ceramic concretes in the XXI century — problems and prospects for applying technology in the field of silicate materials science. Part 1

In the technology of a number of ceramic and refractory materials, prepared on the basis of highly concentrated ceramic binder suspensions (HCBS), elements of effective nanotechnology were realized even before the present “nanoboom.” The concept has been formulated of an advance in materials technology based on HCBS both in traditional fields of their application, and in the field of structural materials science, within which for industrial introduction of existing developments it is necessary to create contemporary equipment formulation for production processes.

Microstructure and Finite Element Analysis about Ceramic Concrete after High Temperature

This paper researched the high temperature properties of ceramic concrete though experimental. Test and analysis on the microstructure between the ceramic concrete and ordinary concrete which experience different temperatures using scanning electron microscopy (SEM); and analysis on the high temperature performance of the ceramic concrete using finite element method .The results show that: the C-S-H gel, Ca (OH)2crystals and the interfacial transition zone between aggregate and colloidal and other microstructure have different characteristics, these features can be used to explain the main reasons for changes of the concrete performance indicators after the high temperature and to provide technical basis for the application of ceramic concrete in the high temperature environment.

Preparation and properties of corundum HCBS and ceramic concretes. Part 3. Casting and volume constancy of ceramic concretes

Vibration casting and casting from a self-spreading mix with an original moisture content of molding systems of 3.8 – 4.2% are used to prepare coarse-grained (D max = 10 mm) and medium-grained (D max = 3 mm) corundum ceramic concretes with a corundum-mullite matrix system. Depending on the heat treatment temperature, the amount of their open porosity is 11 – 15%, and the ultimate strength in compression reaches 160 MPa. Both cast and compacted ceramic concretes have high volume constancy during heating or firing, and also in service. Linear shrinkage does not exceed 0.2 – 0.5%.

Effective service of aluminosilicate ceramic concretes in a furnace lining for firing objects in the ceramic industry

Basic material science approaches are considered for developing and manufacturing the lining of kiln trolleys of contemporary ceramic industry kilns. Many years of experience is provided of successful service of aluminosilicate ceramic concretes in heating units of different ceramic production. It is shown that use of ceramic concrete composites combined with convenient structural solutions of the company ZAO Teplokhimmontazh makes it possible to increase the operating life of the lining of kiln trolleys up to five years (not less than 500 cycles).

Preparation and properties of corundum HCBS and ceramic concretes. Part 2. Composition and properties of compacted ceramic concretes

The effect of the composition of original molding systems and firing temperature on the properties of fine-grained (D max = 1.5 mm) and medium grain sized (D max = 4.0 mm) specimens of compacted corundum ceramic concretes with a corundum-mullite matrix system are studied. Optimum properties (open porosity of 14 – 15%, ultimate strength in compression of 150 – 200 MPa) are achieved in compositions with a matrix system content of 30 – 35%. A calculation and experimental method is used to determine matrix system porosity in ceramic concrete specimens in relation to their composition.