Cement Composition Materials Based on Electrochemically and Electromagnetic-activated Filling Water

Calcareous sand, as a blow-fill or construction material, is widely used in island and reef construction projects in marine environments after treatment. When microorganism-induced mineralization is used to strengthen calcareous sand, salinity and other conditions in the marine environment will adversely affect microorganisms or their mineralization process. For this reason, the two environmental conditions created by deionized water and simulated seawater were introduced to explore their effects on the growth and urease activity of Sporosarcina pasteurii. Then, the changes in the permeability and mechanical strength of calcareous sand under different mineralization methods were compared by one-dimensional sand column tests. Finally, the reinforcement mechanism was compared and analyzed based on the results of scanning electron microscopy and X-ray diffraction tests. The results show that Sporosarcina pasteurii can induce carbonate and phosphate precipitation and mineralization to strengthen calcareous sand in simulated seawater. The mineralized products greatly reduce the permeability of calcareous sand and significantly improve the mechanical strength by wrapping calcareous sand particles, filling water seepage channels and cementing adjacent particles. The reinforcement effect of carbonate mineralization is better than that of phosphate mineralization, but phosphate mineralization has less impact on the environment during the treatment process.

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PREPARATION OF EPOXIDE ED-20-BASED COMPOSITION MATERIALS

Chemical Problems ◽

10.32737/2221-8688-2020-1-118-123 ◽

2020 ◽

Vol 18 (1) ◽

pp. 118-123

Author(s):

A.A. Ragimova ◽

◽

E.D. Mamedov ◽

◽

...

Keyword(s):

Composition Materials

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Experimental Study on Shear Failure Mechanism and the Identification of Strength Characteristics of the Soil-Rock Mixture

Shock and Vibration ◽

10.1155/2019/7450509 ◽

2019 ◽

Vol 2019 ◽

pp. 1-25

Author(s):

Shaorui Sun ◽

Feng Zhu ◽

Jihong Wei ◽

Wuchao Wang ◽

Huilin Le

Keyword(s):

Failure Mechanism ◽

Shear Failure ◽

Horizontal Displacement ◽

Strength Characteristics ◽

Laboratory Model ◽

Gravel Size ◽

Shear Process ◽

Composition Materials ◽

The Relationship ◽

Laboratory Models

Soil-rock mixture (SRM) is a special geological material that has the unique properties of rock or soil. Studies on the strength characteristics of the SRM have very important theoretical significance and practical value. In this study, the gravel proportions, gravel sizes, gravel shapes, and repetitive results of shear experiments are considered in laboratory experiments and for the identification of strength parameters. To the gravel shapes, from the angle of the composition materials of SRM, the experimental samples include samples with breccia gravels and with subrounded gravels. And, in this study, the laboratory model experiment is used to research the strength characteristics of SRM. In addition, the shear failure mechanism is used to establish the relationship between the microfailure mechanism and the macrostrength parameters identification. Taking gravel proportion, gravel size, gravel shape, and repetitive shear process as the influencing factors of the SRM, the laboratory models have been remolded, and laboratory direct shear experiments have been carried out. The shear deformation laws of the SRM are researched on the basis of the analysis of the curves of shear stress and the horizontal displacement.

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Formation of disinfection by-products in indoor swimming pool water: The contribution from filling water natural organic matter and swimmer body fluids

Water Research ◽

10.1016/j.watres.2010.09.031 ◽

2011 ◽

Vol 45 (2) ◽

pp. 926-932 ◽

Cited By ~ 97

Author(s):

Amer Kanan ◽

Tanju Karanfil

Keyword(s):

Organic Matter ◽

Natural Organic Matter ◽

Body Fluids ◽

Swimming Pool ◽

Pool Water ◽

Indoor Swimming Pool ◽

Filling Water ◽

Swimming Pool Water ◽

By Products

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Influence Factors on the Properties of Ultrahigh-Performance Fiber-Reinforced Concrete Cured under the Condition of Room Temperature

Advances in Civil Engineering ◽

10.1155/2018/2754735 ◽

2018 ◽

Vol 2018 ◽

pp. 1-9

Author(s):

Pu Zhang ◽

Yiliang Huang ◽

Yongqi Li ◽

Jun Zhao ◽

Hengqian Dong ◽

...

Keyword(s):

Compressive Strength ◽

Reinforced Concrete ◽

Fly Ash ◽

Influence Factors ◽

Volume Ratio ◽

Fiber Reinforced Concrete ◽

Fiber Reinforced ◽

Curing Conditions ◽

Heat Curing ◽

Composition Materials

Ultrahigh-performance fiber-reinforced concrete (UHPFRC) is a new type of concrete with excellent performance and good application prospects. However, expensive heat curing or high-pressure curing was often adopted to ensure the sufficient compressive strength. This study focuses on improving the compressive strength and workability of UHPFRC by changing the composition materials and the mixture ratios under standard curing conditions. The 0-1 mm and 1∼3 mm sintered bauxite was adopted as coarse aggregate. UHPFRC with high compressive strength and good workability was developed by changing the water-binder ratios, by adding ground-granulated blast furnace slag (GGBFS) or fly ash, and by changing the bauxite content of different particle sizes. When the volume ratio of steel fiber was 3%, the recommend water to binder ratio was 0.194 according to this experiment, the dosage of GGBFS-replaced cement is recommended as 20%, the dosage of fly ash instead of silica fume is recommended as 30%. The recommend ratio of 0-1 mm and 1∼3 mm sintered bauxite was 1.51 : 1. Finally, a kind of UHPFRC material with a compressive strength of 152.4 MPa and a slump of 120 mm was developed under the standard curing conditions.

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