Recycled Brick Research Articles

Phase Composition Analysis of Recycled MgO-C Ladle Lining Materials

With the iron and steel metallurgy, cement, ceramic and other industries making a rapid development, the refractory consumption in our country is quite large. So how to recycle the used refractory materials effectively is more and more important. In this experiment, the phase composition of ladle lining bricks at slag line, rampart and bottom were researched systematically, to determine the phase composition change between the unused and recycled materials. It turned out that the low melting point minerals CaMgSiO4 and Ca3Mg (SiO4)2 formed due to the reaction between MgO and the impurity compositions like SiO2 and CaO from the melted slag and liquid steel. On the one hand, the formation of these low melting point minerals was one of the main reason for the damage of the recycled MgO-C ladle lining bricks. On the other hand, the alkaline magnesium carbon bricks had purification effect for the liquid steel as a result of the content reduction of SiO2 and CaO.

Experimental Study on Drying Shrinkage Performance of Solid Concrete Bricks Made from Recycled Coarse Aggregate

Solid recycled coarse aggregate concrete bricks were produced by QTY4-40 brick machine with strength grades of MU15-MU30. Recycled aggregate replacement rate was up to 100%. Water absorption and moisture content were tested. Two methods were taken to test the drying shrinkage. The impact of recycled aggregate replacement rate and curing period on the drying shrinkage rate, water absorption, moisture content, density was analyzed, and the relationship between them was presented. The results indicate that recycled aggregate can increase the shrinkage of solid concrete brick. The shrinkage of recycled solid concrete bricks' (fully substitute) is larger than ordinary concrete bricks' by 1.6-2 times. Water reducer is helpful to improve the water retention and decrease the shrinkage of brick. One of the test results of shrinkage got by the methods recommended in relevant specification is smaller.

Experimental Study on Strength and other Performance of Solid Concrete Bricks Made from Recycled Coarse Aggregate

Recycled coarse aggregate solid concrete bricks were produced by QTY4-40 brick machine with strength grades of MU15-MU30. Compression and flexural strength of solid recycled coarse aggregate concrete brick were investigated. The impact of recycled aggregate on the solid concrete brick mechanical properties and physical properties was analyzed. The relationship between physical properties and strength, density was discussed.

Research on Pricing Strategy of Recycled Bricks Based on Evolutionary Game

Research on Pricing Strategy of Recycled Bricks Based on Evolutionary Game

Fractal Study for Surface Cracks on the Recycled Concrete Beams with Recycled Bricks

In this paper, the experimental research on crack of four recycled aggregate concrete simple beams under a concentrated load was presented. Through the analysis of evolution and distribution characteristics of cracks with different amount of recycled brick, it is verified that the surface cracks on the recycled aggregate concrete beams have a very good fractal behavior. The research shows that the content of the recycled brick has obvious influence on the fractal dimension of the surface cracks of the beams. The more the content of the recycled brick is, the bigger the fractal dimension is. So the fractal dimension can be regarded as an index to evaluate damage degree of the recycled aggregate concrete beam. This research provides a novel idea and a method for studying the damage of the concrete structures.

Research on the Seismic Performance of Construction Waste Recycled Brick Masonry Structure

In order to research the seismic property of masonry building constructed with the construction waste recycled bricks, a four stories building model with 1:3 scale is constructed and tested on the shaking table. Based on the test results, the cracks pattern, displacement response, acceleration response of the building are studied. The failure mechanism of the infill building is investigated. The results show that the construction waste recycled brick is a qualified building material to construct the low rise building.

CT Image Analysis on the Meso-Damage of Construction Waste Recycled Brick

Based on industrial CT technique, Meso-mechanical experiment was conducted on construction waste recycled brick to get the real-time CT image and stress-strain curve of brick during the loading process. Box counting method was used to calculate the fractal dimension of the inner pore transfixion and crack evolution. The results showed that lots of pore in the interfacial transition zone mainly resulted in the damage of the brick. With the increase of stress, the opening through-pore appeared and crack expanded, and the fractal dimension increased.

Environmentally-friendly bedding mortars for repair of historical buildings

In this work, the possibility of using environmentally-friendly mortars (with crushed bricks replacing sand) as bedding mortars for repair of historical building was studied. When bedding mortars are used for intervention on historical building a compatibility issue can emerge. Indeed, if masonry containing sulphate salts is restored by using mortars based on hydraulic binders the risk of failure is high. For this reason, as binders alternatively a blended cement and a hydraulic lime were used, both proving to be unsensitive to sulphates. Two crushed brick aggregates were alternatively added to the mortars by fully replacing virgin sand; they showed different grain size distributions and, consequently, a different content of very fine materials. All the environmentally-friendly mortars were characterized from a mechanical point of view, and also their ability to adhere to two different kinds of bricks was investigated. Then, their physical behaviour was studied through microstructure characterization, as well as through the evaluation of both resistance to the vapour permeability and capillary water absorption. Results obtained showed that the use of recycled bricks instead of virgin sand, if finely ground, could allow to strongly improve mortar-brick bond strength; while, if roughly ground, it could allow to achieve a good compromise between vapour permeability and capillary absorption of mortar.

Recycled-Aggregate Bedding Mortars for Repair of Historical Buildings

In this work, the possibility of using environmentally-friendly mortars (with crushed bricks replacing sand) as bedding mortars for repair of historical building was studied. When bedding mortars are used for intervention on historical building a compatibility issue can emerge. Indeed, if masonry containing sulphate salts is restored by using mortars based on hydraulic binders the risk of failure is high. For this reason, as binders alternatively a blended cement and a hydraulic lime were used, both proving to be unsensitive to sulphates. Two crushed brick aggregates were alternatively added to the mortars by fully replacing virgin sand, they showed different grain size distributions and, consequently, a different content of very fine materials. All the environmentally-friendly mortars were characterized from a mechanical point of view. Then their physical behaviour was studied trough microstructure characterization, as well as through the evaluation of both their resistance to the vapor permeability and their capillary water absorption. Results obtained showed that the use of recycled bricks instead of virgin sand, particularly if roughly ground, could allow to achieve a good compromise between vapour permeability and capillary absorption of mortar.

Concrete paving blocks and flags made with crushed brick as aggregate

Demolition of old buildings in urban cores has produced a large amount of waste material. Since they are mostly masonry structures the largest part of the waste material is ceramic waste. Besides that, ceramic waste is obtained as a byproduct in the ceramic industry. All of this initiated a research for the application of concrete with recycled brick as aggregate. In this paper, the possibility of using crushed bricks in the production of concrete elements for the pedestrian zone is shown. The application of recycled brick as aggregate, produces concrete of less density and strength, and of increased absorption. All of this also has an effect on the quality of concrete flags and paving blocks. Based on the results obtained by testing the resistance to frost of concrete it was assumed that it is possible to get the products comply with European standards. The results show that replacing up to a 32.5% of natural aggregate with crushed brick aggregate produces concrete blocks, and up to 65% of it produces concrete paving flags which meet the requirements of European standards.

Mechanical Analysis of the Recycled Concrete Brick Masonry Wall under In-Plane Load

The purpose of this paper was to investigate the mechanical behavior and failure mode of recycled concrete brick masonry wall under cycling in-plane load. These models of masonry walls were constructed in the laboratory and experimented under in-plane cycling load. The masonry wall was made of recycled concrete bricks joined by mortar, with gypsum lining on both faces. A simulation based on the experiment was carried out using the finite element software ANSYS. In the proposed FE model, the recycling concrete bricks and joints were modeled separately, allowing for nonlinear deformation characteristics of the two materials. The results of the experiment and the finite element analysis were analyzed and compared. When the stress distributions were taken into consideration in the experiments and solutions of ANSYS, it was observed that the stress concentration occurred on two diagonals of the masonry wall. The destruction process and characteristics of the masonry wall were obtained by the experiments. The results of finite element method matched experimental results very well. The FE software ANSYS can be used in the analysis of recycling concrete brick masonry walls under in-plane cycling load and strength capacity.

Frost resistance of concrete with crushed brick as aggregate

The investigation included concrete made by using recycled brick as aggregate. Experimental work included several types of concrete made with the same cement content (385 kg/m3), and same consistency (slump about 1 cm). Recycled brick and combination of natural river aggregate and recycled brick were used as aggregates. The influence of percentage and grain size of crushed brick aggregate on concrete compressive strength, water absorption and frost resistance were observed. On the basis of the results obtained during experimental research, a general conclusion can be drawn that the application of recycled concrete as aggregate can lead to new composites with satisfactory physical-mechanical properties.

Claybank Voices: The Specificity of (T)Here

In my initial field trips to the Claybank brick facility in southern Saskatchewan, I was struck by the quiet hauntedness of the site. It was a ghost factory. Wind-swept. Empty buildings. Inhabited by swallows. Lit by beams of light. Pallets of recycled bricks lining the corridors of one enormous stock shed. Ten beehive kilns. Like ziggurats. The quiet made me think of Brecht’s poem “Who Built the Pyramids?”