scholarly journals 1018) The Quality of Concrete in the Early Time of Setting : Study on the Change of Water-Cement Ratio and Settling Ratio during the Early Time, Effected by the Dehydration(Materials Execution)

1964 ◽  
Vol 103 (0) ◽  
pp. 18
Author(s):  
Kyubee Kizawa ◽  
Isamu Tanahashi
Keyword(s):  
Early Time ◽  
Cement Ratio ◽  
Water Cement Ratio

Preparation and Characteristics of Light Foam Cement

2017 ◽  
Vol 727 ◽  
pp. 1029-1034
Author(s):  
Yan Zhang ◽  
Hui Chao Chu ◽  
Hui Li ◽  
Chun Yu Hua ◽  
Xian Jun Lyu
Keyword(s):  
Ordinary Portland Cement ◽  
Raw Materials ◽  
High Strength ◽  
Polypropylene Fibers ◽  
Key Factors ◽  
Foaming Agents ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Heat Preservation

This present paper took ordinary Portland cement as main raw materials to prepare foam cement with properties, such as lightweight, high strength, and heat preservation, by the method of chemical foaming. The authors discussed the effects on the properties by key factors like water/cement ratio, foaming agents, foam stabilizers, accelerator and fibers of foam cement objects. Taken all the results show that in the condition that water/cement ratio of 0.48, foaming agents, foam stabilizers, accelerators and polypropylene fibers were adopted accounting for the quality of cement of 4.8%, 0.6%, 0.25% and 0.4% respectively, the characteristics of prepared formed cement samples could conform to the requirement of standard of JC/T266 formed cement.

scholarly journals Improving the safety of railway subgrade when it is strengthened using soil-cement elements

2019 ◽  
Vol 294 ◽  
pp. 03006
Author(s):  
Vitalii Krysan ◽  
Volodymyr Krysan ◽  
Volodymyr Petrenko ◽  
Oleksii Tiutkin ◽  
Volodymyr Andrieiev
Keyword(s):  
Cement Content ◽  
Laboratory Studies ◽  
Weak Soil ◽  
Civil Structures ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Soil Cement ◽  
Access Road ◽  
The Difference

The article identifies the main parameters of the drilling-mixing technology, which is the most effective in fixing weak soil bases during the construction and restoration of transport, industrial and civil structures. The difference of the technology developed by the authors is that the strengthening process is carried out at low pressure (0.15 ... 0.25 MPa). The relevance of the research is that the proposed technology requires less cost with high rates of restoring the strength of soil foundations. To prove the high quality of the technology, laboratory studies were carried out to determine the optimal characteristics of the soil-cement element, as well as the proportions and composition of the fixing solution. The dependences of the strength of soil-cement elements in the air-dry condition with cement content from 7% to 23% with water-cement ratio in solution 1 / 0.3 and with cement content from 13% to 37.5% with water-cement ratio in solution 1/0,6. During the experimental-industrial studies of the author’s technology, the embankment was constructed with the soil-cement-reinforced elements for the access road approaches at one of the facilities in Kirovograd region, which ensured safety in the operation of a complex transport structure.

scholarly journals Preparation and Optimization of Mix ratio for C50T Girder Manufactured Sand and Concrete

2021 ◽  
Vol 4 (2) ◽  
pp. 16
Author(s):  
Honghong Ye ◽  
Delin Zeng ◽  
Yong Yang ◽  
Xingbo Fan ◽  
Wei Wang ◽  
...  
Keyword(s):  
Raw Materials ◽  
Concrete Strength ◽  
Great Influence ◽  
Coal Ash ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Manufactured Sand ◽  
Binding Material ◽  
Type Water

Considering actual construction conditions of Binchuan-Heqing Highway, this paper provides the C50 mix ratio conforming to engineering requirements by strictly controlling the quality of raw materials, optimizing the design of mix ratio scientifically, preparing superior C50 concrete 0 with manufactured sand, and optimizing the concrete mix ratio based on the adjustment of fly ash replacement, water-cement ratio, polycarboxylate-type water reducer mixing amount, sand ratio, etc. The result indicates that, the water-cement ratio has a great influence on the concrete strength, and if the ratio of coal ash is high in the binding material, the early compressive strength of the concrete will increase slowly.

Pfa For Concrete: Mix Proportioning And Strength Development

1987 ◽  
pp. 1-13
Author(s):  
Prof. Madya Dr. Mohd. Warid Hussin
Keyword(s):  
Strength Development ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Mix Proportioning ◽  
Wide Range ◽  
Fuel Ash ◽  
Direct Replacement ◽  
Pulverized Fuel ◽  
Pulverized Fuel Ash

This paper describes an investigation on mix design of concrete incorporation highly percentage of pulverized fuel ash (pfa} as a cement replacement in concrete. Studies are also made on the strength development of OPC/superplasticised pfa concrete designed for a specified workability and 28 days strength equivalent to that of the corresponding OPC concrete capering a very wide range of pfa usage (from 30% to 70%), water: cement ratio and age at test. Mixes designed by partial but direct replacement of 70% of pfa and water, cement ratio of 0.3 and a superplasticizer dosage of 2% by weight of cement + pfa, shows a slightly lower strength compared to OPC at earlier age but the concrete achieves comparable strength to OPC concrete at later ages. Such a concrete also exhibits highly workable properties with no detrimental effects on the quality of the concrete. Keywords: admixtures, compressive strength, flexural strength, fly ash, workability, proportioning, water-cement ratio, superplasticizer

scholarly journals Use of Nondestructive Testing of Ultrasound and Artificial Neural Networks to Estimate Compressive Strength of Concrete

Buildings ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 44
Author(s):  
Fernando A. N. Silva ◽  
João M. P. Q. Delgado ◽  
Rosely S. Cavalcanti ◽  
António C. Azevedo ◽  
Ana S. Guimarães ◽  
...  
Keyword(s):  
Neural Networks ◽  
Compressive Strength ◽  
Artificial Neural Networks ◽  
Cross Sections ◽  
Influential Factors ◽  
Average Error ◽  
Ann Model ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Artificial Neural

The work presents the results of an experimental campaign carried out on concrete elements in order to investigate the potential of using artificial neural networks (ANNs) to estimate the compressive strength based on relevant parameters, such as the water–cement ratio, aggregate–cement ratio, age of testing, and percentage cement/metakaolin ratios (5% and 10%). We prepared 162 cylindrical concrete specimens with dimensions of 10 cm in diameter and 20 cm in height and 27 prismatic specimens with cross sections measuring 25 and 50 cm in length, with 9 different concrete mixture proportions. A longitudinal transducer with a frequency of 54 kHz was used to measure the ultrasonic velocities. An ANN model was developed, different ANN configurations were tested and compared to identify the best ANN model. Using this model, it was possible to assess the contribution of each input variable to the compressive strength of the tested concretes. The results indicate an excellent performance of the ANN model developed to predict compressive strength from the input parameters studied, with an average error less than 5%. Together, the water–cement ratio and the percentage of metakaolin were shown to be the most influential factors for the compressive strength value predicted by the developed ANN model.

Study on Preparation of Solid Concrete Brick with Recycled Aggregate

2013 ◽  
Vol 648 ◽  
pp. 108-111
Author(s):  
Qi Jin Li ◽  
Guo Zhong Li
Keyword(s):  
Compressive Strength ◽  
Mass Fraction ◽  
Recycled Aggregate ◽  
Preparation Process ◽  
Mass Ratio ◽  
Construction Waste ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Optimal Value

The construction waste was processed into recycled aggregate to produce solid construction waste brick with grade of MU20. The preparation process of recycled aggregate and the optimal value of mass ratio of water to cement (water cement ratio) and mass ratio of recycled aggregate to cement was studied. The results shows that when the water cement ratio is 0.86 and the mass ratio of recycled aggregate to cement is 5.5 and the dosage of activator is 0.25% (mass fraction with recycled aggregate), the compressive strength of sample is 22.5MPa and can be satisfied with the requirement of MU20 solid concrete brick.

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