Optimum Study and Engineering Application of Mixing Ratio for C50 Concrete

2010 ◽  
Vol 168-170 ◽  
pp. 537-540 ◽  
Author(s):  
Xiao Sheng Song ◽  
Guo Qiang Xu
Keyword(s):  
Concrete Strength ◽  
Engineering Application ◽  
Concrete Mixture ◽  
Orthogonal Experimental Design ◽  
Mixing Ratio ◽  
Polycarboxylic Acid ◽  
Mixture Ratio ◽  
Acid Type ◽  
Type Water ◽  
And Performance

The influence of fly ash content, water-cement ratio, sand ratio and polycarboxylic acid type water-reducer dosage on the early-strength and performance of C50 concrete is investigated combined with engineering application. The concrete mixture ratio is optimized by the orthogonal experimental design. Concrete strength, slump and slump loss are verified by experiments. Application results show the designed concrete mixture ratio reaches the expected requirements

Less Loss of Fluidity of Polycarboxylic Acid Type Water Reducer

2011 ◽  
Vol 71-78 ◽  
pp. 3452-3456
Author(s):  
Xun Zhong
Keyword(s):  
Molecular Weight ◽  
Cement Paste ◽  
Side Chain ◽  
Polycarboxylic Acid ◽  
Acid Type ◽  
Type Water ◽  
Different Molecular Weight

Cement paste and concrete with different molecular weight of side-chain of polycarboxylic acid type water reducer (PC) and retarder has been researched. In this way, the method of adjusting the molecular weight of side-chain and complexing retarder to hold fluidity has been discussed. The results show that with increase molecular weight of side-chain, the dispersibility and holding dispersibility increases. With retarder and PC, the dispersibility and holding dispersibility of PC with big more molecular weight of side-chain increases and the loss of fluidity at 1h prominence reduces. But it relates to breed of cement. Especially at low ratio of water and cement, when molecular weight of side-chain is more than 2000, complexing PC and retarder can improve the fluidity and holding fluidity.

A Study on Ratio Design and Construction Technology of SAC Asphalt Concrete

2014 ◽  
Vol 488-489 ◽  
pp. 821-824
Author(s):  
Qian Yang
Keyword(s):  
Surface Structure ◽  
Asphalt Concrete ◽  
Highway Construction ◽  
Concrete Mixture ◽  
Construction Technology ◽  
Mixing Ratio ◽  
Test Results ◽  
Dense Structure ◽  
Mixture Ratio ◽  
Mixture Ratio Design

In the process of construction, with the mixture ratio design and appropriate construction conditions of SAC asphalt concrete mixture, it can not only have dense gradation with typeIasphalt concrete which has good durability and small porosity with its skeleton dense structure, but also it can be compatible with typeIIasphalt concrete which has the ability to resist deformation and the depth of the surface structure. This paper is making an effective exploration on the construction technology and the mixing ratio design of SAC asphalt concrete with the aid of the authors construction test results of a certain highway construction.

Effect of Molecular Weight of Long-Side-Chain of Polycarboxylic Acid Type Water-Reducer on Hydration of C3A

2011 ◽  
Vol 71-78 ◽  
pp. 250-256 ◽  
Author(s):  
Hong Bo Tan ◽  
Bao Guo Ma ◽  
Kai Ke ◽  
Jun Xiao
Keyword(s):  
Molecular Weight ◽  
Chain Structure ◽  
Reducing Agents ◽  
Side Chain ◽  
Polycarboxylic Acid ◽  
Acid Type ◽  
Hydrated Products ◽  
Type Water

Several polycarboxylic acid type water-reducing agents (PCs) with different side-chain structure have been synthesized. The effect of side-chain structure of PCs on hydration of C3A has been investigated by XRD, TG-DSC and SEM. The results show that PCs restrain hydration of C3A as a whole, but accelerate the transformation from C2AH8 to Al (OH) 3 and C3AH6; for structure of the PCs, the bigger molecular weight of long-side-chain of PCs is advantage to restrain hydration of C3A. And it also is better to formation of six-party flake hydrated products. But the little molecular weight of long-side-chain of PCs tends to form the cube-shaped hydrated products.

scholarly journals Properties of sand concrete with recycled tyre polymer fibers

2021 ◽  
Vol 263 ◽  
pp. 01015
Author(s):  
Oksana Larsen ◽  
Viktoria Shvetsova ◽  
Ekaterina Patsenko ◽  
Artyom Polozov
Keyword(s):  
Concrete Strength ◽  
Strength Properties ◽  
Polymer Fibers ◽  
Concrete Mixture ◽  
Optimal Dosage ◽  
Polymer Fiber ◽  
Perspective View ◽  
Concrete Technology ◽  
Tyre Waste ◽  
And Performance

Disposal of tyre waste is a major environmental problem in all over of the world. It has been estimated that more than 1.5 billion tyres are produced annually and almost one million end their service life. More than 50% of them are accumulated on landfills. The tyre fiber can be added to the concrete mixture to improve not only the strength properties, but also the crack resistance of the composition. The use of recycled tire polymer fibers as reinforcement component is a perspective view on the development of dispersed concrete technology. In this research the main characteristics of the fiber and the technological characteristics of the concrete mixture are presented. The effect of the polymer fiber on strength and performance properties of sand concrete are shown. It was found that the optimal dosage of fiber is 1 kg/m3, the adding of the fiber reduces at the range 3.6% of slump of the concrete mixture. It was found that each 10 kg/m3 of recycled polymer fiber reduce the density of samples by 4%. The addition of such amount of the polymer fiber reduces the compressive strength. The addition of 1 kg/m3 has the significant effect on the reduction of the compressive and flexural concrete strength with class B15, while the same characteristics of concrete with class B30 are higher. The results of this research allow to conclude that such fiber is suitable to use in concrete with class В30 and lower.

Effect of Side-Chain Structure of Polycarboxylic Acid Type Water-Reducer on Hydration of C3A

2012 ◽  
Vol 550-553 ◽  
pp. 807-812 ◽  
Author(s):  
Yan Chao Zhu ◽  
Bao Guo Ma ◽  
Hong Bo Tan
Keyword(s):  
Molecular Weight ◽  
Chain Structure ◽  
Side Chain ◽  
Polycarboxylic Acid ◽  
Acid Type ◽  
Hydrated Products ◽  
Type Water

Several polycarboxylate superplasticizers (PCs) with different side-chain structure have been synthesized. The effect of side-chain structure of PCs on hydration of C3A has been investigated by XRD, TG-DSC and SEM. The results show that PCs restrain hydration of C3A as a whole, but accelerate formation of Al(OH)3 and C3AH6; with increase molecular weight of long-side-chain, hydration of C3A is slowed, and the formation of Al (OH)3 and C2AH8 also become slowed. With increase proportion of long-side-chain, hydration of C3A and formation of C3AH6 are slowed, but existence of C2AH8 become obvious. The six-party flake hydrated products of C3AH6 are formed with a large number of grafted carboxyl.

Crack Pattern and Ductility of Steel Reinforced Ultra High Strength Concrete Composite Joint Subjected to Reversal Cycle Load

2009 ◽  
Vol 417-418 ◽  
pp. 845-848 ◽  
Author(s):  
Chang Wang Yan ◽  
Jin Qing Jia ◽  
Ju Zhang
Keyword(s):  
High Strength Concrete ◽  
Plastic Hinge ◽  
Engineering Application ◽  
Load Ratio ◽  
High Strength ◽  
Strength Concrete ◽  
Weak Beam ◽  
Composite Joint ◽  
And Performance ◽  
Beam Plastic Hinge

In order to investigate the seismic damage and performance of steel reinforced ultra high strength concrete composite joint subjected to reversal cycle load, six interior strong-column-weak-beam joint specimens were tested with various axial load ratio and volumetric stirrup ratio. A discussion on the crack mode and ductility was presented. It was found that all joint specimens failed in bending with a beam plastic hinge in a ductile manner, with crack propagation different from the weak-column-strong-beam joint. The experimental results indicated that test parameters of the steel reinforced ultra high strength concrete composite joint with good seismic performance may be referred for engineering application.

scholarly journals Manycore Performance-Portability: Kokkos Multidimensional Array Library

2012 ◽  
Vol 20 (2) ◽  
pp. 89-114 ◽  
Author(s):  
H. Carter Edwards ◽  
Daniel Sunderland ◽  
Vicki Porter ◽  
Chris Amsler ◽  
Sam Mish
Keyword(s):  
Programming Model ◽  
Engineering Application ◽  
Data Access ◽  
Memory Space ◽  
Performance Requirements ◽  
Application Programming ◽  
Multidimensional Array ◽  
And Performance ◽  
Data Access Patterns ◽  
Access Patterns

Large, complex scientific and engineering application code have a significant investment in computational kernels to implement their mathematical models. Porting these computational kernels to the collection of modern manycore accelerator devices is a major challenge in that these devices have diverse programming models, application programming interfaces (APIs), and performance requirements. The Kokkos Array programming model provides library-based approach to implement computational kernels that are performance-portable to CPU-multicore and GPGPU accelerator devices. This programming model is based upon three fundamental concepts: (1) manycore compute devices each with its own memory space, (2) data parallel kernels and (3) multidimensional arrays. Kernel execution performance is, especially for NVIDIA® devices, extremely dependent on data access patterns. Optimal data access pattern can be different for different manycore devices – potentially leading to different implementations of computational kernels specialized for different devices. The Kokkos Array programming model supports performance-portable kernels by (1) separating data access patterns from computational kernels through a multidimensional array API and (2) introduce device-specific data access mappings when a kernel is compiled. An implementation of Kokkos Array is available through Trilinos [Trilinos website, http://trilinos.sandia.gov/, August 2011].

scholarly journals Analysis of influencing factors of flow state concrete mixture performance

2021 ◽  
Vol 2076 (1) ◽  
pp. 012073
Author(s):  
Dandan Shi ◽  
Xing Qin ◽  
Hao Qu
Keyword(s):  
Measurement Method ◽  
Engineering Application ◽  
Performance Testing ◽  
Reducing Agent ◽  
Mineral Admixture ◽  
Raw Material ◽  
Concrete Mixture ◽  
Flow State ◽  
Test Results ◽  
Concrete Mix

Abstract Based on the principle of benefiting the durability of concrete, machined sand is used to configure C40 flow concrete, and the engineering application environment and economy are considered. In this paper, the author through the flow state concrete mix ratio design, give the raw material dosage, concrete mixing, finally combined with the workability measurement method, five groups of concrete mix performance testing. According to the test results, the influence of mineral admixture and water reducing agent on the workability of concrete mixture is studied and analyzed, and the reasonable admixture dosage and water reducing rate of water reducing agent and its admixture dosage are finally given.

Preparation of Nanosized TiO2-Photocatalyst From-Sludge (TFS) and the Characteristics of Concrete Sidewalk Blocks Using TFS

2021 ◽  
Vol 21 (7) ◽  
pp. 3882-3886
Author(s):  
Yong-Wook Jung ◽  
Jong Kyu Kim
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Degradation ◽  
Air Pollutants ◽  
Removal Rate ◽  
Low Cost ◽  
Sewage Treatment ◽  
Mixing Ratio ◽  
Tio2 Photocatalyst ◽  
And Performance ◽  
Nanosized Tio2

In this study, nano-sized low cost titanium dioxide (TFS) was prepared using sludge from sewage treatment and performance was verified. To remove air pollutants, the photocatalytic degradation of methylene blue and efflorescence characteristics is assessed according to the mixing ratio of the nano-sized TFS by applying them to concrete sidewalk blocks. The photocatalytic degradation performance of concrete sidewalk blocks shows that the methylene blue removal rate of specimens containing 2.5%, 5%, and 10% of nano-sized TFS is 29%, 27%, and 38%, respectively. When the nano-sized TFS is mingled on the surface of the sidewalk block, the performance of anti-corrosion and antifouling showed excellency mainly due to the moisture blocking derived by the antifouling function of photocatalysts.

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