Experimental Study on the Strength and Damping Properties of Polymer Recycled Concrete

2018 ◽  
Vol 1145 ◽  
pp. 117-122 ◽  
Author(s):  
Wei Liu ◽  
Jian Xin Zhou ◽  
Feng Zhang ◽  
Guo Tai Li
Keyword(s):  
Compressive Strength ◽  
Performance Test ◽  
Failure Process ◽  
Testing Machine ◽  
Concrete Block ◽  
Test Methods ◽  
Recycled Concrete ◽  
Ordinary Concrete ◽  
Strength Failure ◽  
Concrete Cube

This paper designed and completed the different polymer dosage of recycled concrete, was prepared by adding amount was 7%, 14%, 21%, 14% styrene butadiene latex recycled concrete, recycled rubber powder recycled concrete and ordinary concrete block, the cube compressive strength and damping performance test. The cube compressive strength of concrete test according to the ordinary concrete mechanics performance test methods, specimen is 150×150×150 mm cube specimens, pressure testing machine loading speed is 0.5 MPa per second. The concrete damping performance test is carried out according to the free attenuation method, with the hammer vibration test device, the test piece is T type. Based on the damage form of specimens, the compressive strength and damping performance analysis, and compared with ordinary concrete as the benchmark analysis test results show that the polymer recycled concrete cube compressive strength failure process and failure pattern basic consistent with common concrete. In the water/cement ratio, sand ratio, and amount of material per unit volume is the same, under the condition of polymer recycled concrete cube compressive strength is lower than normal concrete, damping performance is higher than that of ordinary concrete, the compressive strength is inversely proportional to the damping sexual relations.

Research on Mechanical Properties of Polymer Regenerative Concrete

2017 ◽  
Vol 873 ◽  
pp. 147-152
Author(s):  
Wei Liu ◽  
Shi Min Zhang ◽  
Hong Hao Ying ◽  
Nan Zhao
Keyword(s):  
Compressive Strength ◽  
Performance Test ◽  
Failure Process ◽  
Testing Machine ◽  
Concrete Block ◽  
Test Methods ◽  
Recycled Concrete ◽  
Ordinary Concrete ◽  
Strength Failure ◽  
Concrete Cube

This paper designed and completed the different polymer dosage of recycled concrete, was prepared by adding amount was 7%, 14%, 21%, 14% styrene butadiene latex recycled concrete, recycled rubber powder recycled concrete and ordinary concrete block, the cube compressive strength and damping performance test. The cube compressive strength of concrete test according to the ordinary concrete mechanics performance test methods, specimen is 150×150×150 mm cube specimens, pressure testing machine loading speed is 0.5 MPa per second. The concrete damping performance test is carried out according to the free attenuation method, with the hammer vibration test device, the test piece is T type. Based on the damage form of specimens, the compressive strength and damping performance analysis, and compared with ordinary concrete as the benchmark analysis test results show that the polymer recycled concrete cube compressive strength failure process and failure pattern basic consistent with common concrete; In the water/cement ratio, sand ratio, and amount of material per unit volume is the same, under the condition of polymer recycled concrete cube compressive strength is lower than normal concrete, damping performance is higher than that of ordinary concrete, the compressive strength is inversely proportional to the damping sexual relations.

Effect of Water-Cement Ratio on Carbonation and Steel-Corrosion Resistance of Recycled Concrete

2012 ◽  
Vol 174-177 ◽  
pp. 1552-1557 ◽  
Author(s):  
Ya Li Sun ◽  
Jin Song Zhu
Keyword(s):  
Compressive Strength ◽  
Concrete Strength ◽  
Steel Corrosion ◽  
Recycled Concrete ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Ordinary Concrete ◽  
Steel Bar ◽  
Steel Corrosion Resistance ◽  
Concrete Cube

This paper studies the effects of different water-cement ratio on recycled concrete strength, anti-carbonation capability, and protecting reinforce steel bar capability. Select the water-cement ratio 0.6,0.55,0.5,0.45,0.4 five cases of the pilot study.It shows that: recycled concrete cube compressive strength, anti-carbonation capacity and protecting reinforce steel bar capability are less than ordinary concrete.

Experimental Study on Compressive Strength of Recycled Aggregate Concrete with Different Replacement Ratios

2012 ◽  
Vol 174-177 ◽  
pp. 1277-1280 ◽  
Author(s):  
Hai Yong Cai ◽  
Min Zhang ◽  
Ling Bo Dang
Keyword(s):  
Experimental Study ◽  
Compressive Strength ◽  
Failure Mode ◽  
Failure Process ◽  
Recycled Concrete ◽  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
Recycled Aggregates ◽  
Replacement Ratio ◽  
Aggregate Concrete

Compressive strengths of recycled aggregate concrete(RAC) with different recycled aggregates(RA) replacement ratios at 7d, 28d, 60d ages are investigated respectively. Failure process and failure mode of RAC are analyzed, influences on compressive strength with same mix ratio and different RA replacement ratios are analyzed, and the reason is investigated in this paper. The experimental results indicate that compressive strength of recycled concrete at 28d age can reach the standard generally, it is feasible to mix concrete with recycled aggregates, compressive strength with 50% replacement ratio is relatively high.

scholarly journals Mechanical and Thermal Properties of RCB Masonry Containing Three Rows of Holes

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Hanquan Yuan ◽  
Lihua Zhu ◽  
Yixuan Wang ◽  
Fengjian Zhang
Keyword(s):  
Mechanical Properties ◽  
Thermal Properties ◽  
Thermal Property ◽  
Theoretical Calculations ◽  
Failure Process ◽  
Concrete Block ◽  
Recycled Concrete ◽  
Mechanical And Thermal Properties ◽  
Thermal And Mechanical Properties ◽  
The Difference

In order to promote and apply the structures of the recycled concrete block (RCB) masonry, the thermal and mechanical properties of the recycled concrete specimens were tested in this study. The RCB can meet load-bearing and seismic requirements and was prepared through experiments. Concurrently, the mechanical property experiment was conducted on the RCB masonry, and then its failure process and mode were discussed. In addition, a thermal property test was completed on the RCB wall, and the difference in the thermal properties of single-row hole, three-row hole, and solid blocks was analyzed by theoretical calculations. The results indicated that the mechanical properties of the RCB masonry were basically the same as those of the natural concrete block masonry, and they have good compressive stability. The calculation formulas of the compressive and shear strengths of the natural concrete block masonry are applicable to the RCB masonry. The RCB masonry containing three rows of holes owns more outstanding thermal property than natural concrete block masonry and satisfies the requirements for related codes.

Experimental Study on Compressive Strength of Recycled Concrete

2011 ◽  
Vol 261-263 ◽  
pp. 75-78 ◽  
Author(s):  
Yi Li ◽  
Jun Lin Tao ◽  
Ting Lei ◽  
Jian Jun Xie
Keyword(s):  
Growth Rate ◽  
Compressive Strength ◽  
Coarse Aggregate ◽  
Testing Machine ◽  
Recycled Concrete ◽  
Concrete Compressive Strength ◽  
Replacement Ratio ◽  
Recycled Coarse Aggregate ◽  
Study Results ◽  
Compressive Strength Test

Recycled concrete which are made by waste concrete has significance of environmental protection and saving natural resources. But there are different study results of recycled concrete of domestic and foreign scholars, so it is necessary to do the further study of recycled concrete. Compressive strength test of 225 concrete standard cube specimens have been done by Hydraulic Type Universal Testing Machine, and the relationships among recycled concrete compressive strength, age and recycled coarse aggregate replacement ratio have been studied. The results show: the growth rate of early strength of recycled concrete is smaller than natural concrete of the same gradation and the growth rate of later strength of recycled concrete is faster than natural concrete; when the recycled coarse aggregate replacement ratio increases the compressive strength of concrete decreases, and when the recycled coarse aggregate replacement ratio is over 70%, the decrease ranges more apparent.

scholarly journals Study on the Modification Formula of Earth Material Compound with Cement and Gravel by Single Lattice Theory

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Kun Zhang ◽  
Bai-Ru Lu ◽  
Yi-Hong Wang ◽  
Zhan Qu ◽  
Le Qu
Keyword(s):  
Compressive Strength ◽  
Lattice Theory ◽  
Cement Content ◽  
Failure Process ◽  
Test Methods ◽  
Test Method ◽  
Mass Ratio ◽  
Peak Displacement ◽  
Earth Material ◽  
Process Failure

Gravel and cement can effectively improve the low strength of traditional Earth materials. There have been few studies on test methods for raw soil-based composite admixtures. By introducing the theory of single lattice formula testing, the compressive strength of 10 formulas and 60 modified raw soil cubic specimens were tested. The failure process, failure mode, and compressive strength of specimens were studied. The effects of different formulations of raw soil on strength, peak displacement, and dispersion were analyzed. The results showed that cement content had a significant effect on the compressive strength and dispersion of earth material specimens. The optimal modification formula of cement, gravel, and raw soil was determined to be 0.1/0.08/0.82 (mass ratio). At the same time, the applicability of the test method was verified, which can be used as a reference for the experimental study on modification formulations of earth materials.

scholarly journals Experimental Investigation on Compressive Properties and Carbon Emission Assessment of Concrete Hollow Block Masonry Incorporating Recycled Concrete Aggregates

2019 ◽  
Vol 9 (22) ◽  
pp. 4870 ◽  
Author(s):  
Chao Liu ◽  
Chao Zhu ◽  
Guoliang Bai ◽  
Zonggang Quan ◽  
Jian Wu
Keyword(s):  
Compressive Strength ◽  
Concrete Block ◽  
Recycled Concrete ◽  
Recycled Aggregate Concrete ◽  
Environmental Benefits ◽  
Recycled Aggregate ◽  
Loading Test ◽  
Aggregate Concrete ◽  
Static Loading Test ◽  
Hollow Block

In this paper, the compressive strength experiment for three groups of recycled aggregate concrete (RAC) specimens with different replacement ratios of recycled aggregate (0%, 50%, 100%) was carried out. The mechanism of the block and mortar properties on the compressive strength of block masonry was investigated by means of a static loading test. The formula for calculating the compressive strength of a recycled concrete block was obtained based on experimental data. Moreover, the global warming potential (GWP) of recycled aggregate concrete (RAC) block masonry was evaluated by life cycle assessment (LCA) methodology. The feasibility for application of RAC block masonry was discussed combined with environmental impact data analysis. The results show that the strength of RAC blocks is the principal element affecting the compressive strength of block masonry, and the strength of mortar also has a certain impact for the compressive of RAC block masonry; the sub-coefficient of material performance should be enhancive appropriately for ensuring the construction quality of RAC block masonry; the total GWP of RAC block is lower than that of natural aggregate concrete (NAC) block. The environmental benefits of the promotion and application of RAC block masonry are inspiring.

scholarly journals Fracture Characteristics of Polyurethane Grouting Materials Based on Acoustic Emission Monitoring

2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Baihui Ren ◽  
Jianjun Shen ◽  
Weitao Liu ◽  
Yingying Hu ◽  
Qing Cao
Keyword(s):  
Compressive Strength ◽  
Acoustic Emission ◽  
Failure Process ◽  
Testing Machine ◽  
Test Method ◽  
Fracture Characteristics ◽  
Grouting Material ◽  
Orthogonal Test Method ◽  
Grouting Materials ◽  
Polyether Polyol

In this study, 16 groups of tests were designed by the orthogonal test method, and a PU grouting material was prepared, which can be used for the construction of sealing wall in mined-out area of coal mine. The basic properties of the material were measured. Firstly, the viscosity of four groups of samples with different polyether polyol contents was measured by a dynamic rheometer. Secondly, the uniaxial compressive strength of pure slurry samples and sand-containing samples was measured by a universal testing machine. Finally, the failure process of sand-containing samples was monitored by acoustic emission equipment. Through the above research and analysis, a PU grouting material with excellent performance has been obtained. That is, when the ratio of polyether triol:polyether tetraol:catalyst:surfactant:chain extender:plasticizer is 11 : 9 : 0.5 : 1.0 : 1.2 : 6.0, PU grouting material has higher injectability and ideal compressive strength, which has been proved in grouting experiments.

Study of Surface Modification of Recycled Aggregate and Mechanical Properties of the Resulting Concrete

2013 ◽  
Vol 712-715 ◽  
pp. 961-965
Author(s):  
Shu Qing Yang ◽  
Ting Peng ◽  
Wai Ching Tang ◽  
Hong Zhi Cui
Keyword(s):  
Mechanical Properties ◽  
Surface Modification ◽  
Performance Test ◽  
Test Methods ◽  
Recycled Concrete ◽  
Recycled Aggregate Concrete ◽  
Test Method ◽  
Recycled Aggregate ◽  
Recycled Aggregates ◽  
Aggregate Concrete

In this paper, a method of aggregate surface modification using cement paste with RLP (Redispersable Latex Powder) was proposed aiming to improve properties of recycled aggregates and the resulting concrete. In this study, the cement pastes with different dosages of RLP on RA surface modification were used and the effects on the mechanical properties of the resulting concretes were studied. The experiments were carried in accordance with specifications and test methods in Building pebble and gravel (GB/T 14685-2001) and Ordinary concrete mechanics performance test method standard (GB/T 50081-2002). The test results showed that the properties of recycled aggregates were not as good as those of natural aggregates, thus resulting in poorer mechanical properties of the recycled aggregate concrete. By means of aggregate surface modification, the values of water absorption of the recycled aggregate were reduced and consequently the mechanical properties (i.e. compressive strength and elastic modulus) of the resulting recycled concrete were increased. This research provides some useful practical insights to improving mechanical properties of recycled aggregate concrete.

A method for measuring the in-plane compressive strength and the compression behavior of coating layers

TAPPI Journal ◽  
2011 ◽  
Vol 10 (7) ◽  
pp. 29-34
Author(s):  
TEEMU PUHAKKA ◽  
ISKO KAJANTO ◽  
NINA PYKÄLÄINEN
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Calcium Carbonate ◽  
Coating Layer ◽  
Test Methods ◽  
Coating Films ◽  
Precipitated Calcium Carbonate ◽  
Coating Color ◽  
Mineral Coatings ◽  
Styrene Butadiene

Cracking at the fold is a quality defect sometimes observed in coated paper and board. Although tensile and compressive stresses occur during folding, test methods to measure the compressive strength of a coating have not been available. Our objective was to develop a method to measure the compressive strength of a coating layer and to investigate how different mineral coatings behave under compression. We used the short-span compressive strength test (SCT) to measure the in-plane compressive strength of a free coating layer. Unsupported free coating films were prepared for the measurements. Results indicate that the SCT method was suitable for measuring the in-plane compressive strength of a coating layer. Coating color formulations containing different kaolin and calcium carbonate minerals were used to study the effect of pigment particles’ shape on the compressive and tensile strengths of coatings. Latices having two different glass transition temperatures were used. Results showed that pigment particle shape influenced the strength of a coating layer. Platy clay gave better strength than spherical or needle-shaped carbonate pigments. Compressive and tensile strength decreased as a function of the amount of calcium carbonate in the coating color, particularly with precipitated calcium carbonate. We also assessed the influence of styrene-butadiene binder on the compressive strength of the coating layer, which increased with the binder level. The compressive strength of the coating layer was about three times the tensile strength.

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