An Experimental Study on Structural Concrete Frost-Resistance

2013 ◽  
Vol 448-453 ◽  
pp. 1239-1242 ◽  
Author(s):  
Jin Yang Zhang
Keyword(s):  
Frost Resistance ◽  
Core Sample ◽  
Test Block ◽  
Concrete Core ◽  
Mixture Ratio ◽  
Curing Conditions ◽  
Detection Technology ◽  
Block Test ◽  
Quality Of Structure ◽  
Resistance Performance

In engineering quality inspection and acceptance and evaluation of structural properties, the quality of structure real object is paid more and more attention to by all parties involved in construction. But the structural detection technology and corresponding rules are lagging. Through the use of the same batch of concrete structure and frost resistance of concrete test block test, the results show that for the same concrete mix, the frost resistance of standard preserved test block is better than that of the core samples drilled from concrete; as for the mixture ratio, the forming and curing conditions are exactly same as the concrete, and the preserved test block frost-resistance performance is also superior to that of concrete core-sample.

Effect of Cement-Based Permeable Crystallization Material on the Performance of Deterioration Concrete

2013 ◽  
Vol 368-370 ◽  
pp. 905-910
Author(s):  
Jia Bin Liu ◽  
Hong Gen Qin ◽  
Fei Geng ◽  
Wei Guo ◽  
Chao Ming Pang
Keyword(s):  
Compressive Strength ◽  
Frost Resistance ◽  
Chloride Permeability ◽  
Function Mechanism ◽  
Concrete Deterioration ◽  
Chloride Resistance ◽  
Negative Effect ◽  
Resistance Performance

During the long term service, concrete deterioration will occur due to erosion circumstance, load or unload condition, which will have negative effect on its security and durability. This article mainly discusses the effect of cement-based permeable crystallization material on compressive strength, rebound putative strength, carbonization performance, chloride permeability, and frost resistance of deterioration concrete. The result has shown that cement-based permeable crystallization material can effectively improve the strength, carbonization resistance performance and chloride resistance ability, but for the frost resistance is not obvious. We also analyze the function mechanism of the cement-based permeable crystallization material through ESEM observation.

scholarly journals Experimental investigation of concrete strength curve based on pull-out post-insert method

2020 ◽  
Vol 16 (7) ◽  
pp. 155014772094402
Author(s):  
Yuanxun Zheng ◽  
Weixing Kong ◽  
Mengen Ji ◽  
Chao Wan ◽  
Ehsan Moshtagh
Keyword(s):  
Concrete Strength ◽  
Standard Condition ◽  
Core Sample ◽  
Curing Conditions ◽  
Pull Out ◽  
Local Strength ◽  
Engineering Significance ◽  
Strength Curve ◽  
Reference Index ◽  
Drilling Core

As concrete is a building material that is widely used in the field of infrastructure construction, and its quality is related to the quality and service life in infrastructure engineering, concrete strength is an important reference index that reflects the concrete quality. Based on this, two commercial concretes A and B are selected in Henan Province, China, to perform the concrete strength test under same condition curing and standard condition curing in the pull-out post-insert method, cubic compression, rebound method, and drilling core method. The relationships between the different curing conditions, cubic compressive strength, core sample strength, rebound strength, and pull-out force of different commercial concretes are compared and analyzed. Through a comparative analysis and while considering the convenience and accuracy requirements, the strength curves of the two different concretes based on the pull-out post-insert method were fitted and analyzed, and the local strength curve test in Henan based on the pull-out post-insert method was established. The research results provide technical support for evaluating the strength of concrete structures using the pull-out post-insert method, which has important engineering significance for improving the popularize and application of the pull-out post-insert method.

Preparation Experiment and Engineering Application of High Performance Concrete of Freezing Shaft in Deep Alluvium

2014 ◽  
Vol 584-586 ◽  
pp. 1407-1411
Author(s):  
Zhi Shu Yao ◽  
Zhen Xu ◽  
Hai Qing Song
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Raw Materials ◽  
Engineering Application ◽  
High Strength ◽  
Engineering Practice ◽  
Mixture Ratio ◽  
Curing Conditions ◽  
Remarkable Effect ◽  
Shaft Lining

According to the special construction environment and curing conditions of the freezing shaft inner and outer shaft lining in deep alluvium, first,configuration principle of high strength high performance concrete of freezing shaft in deep alluvium is proposed; Then raw materials are selected according to the preparation approach, and preparation experimental study of high strength high performance concrete is conducted with C60, C65, C70and C75 , and the optimum mixture ratio is obtained, and applied to the engineering practice, achieving remarkable effect.

scholarly journals Water absorptivity and frost resistance performance of self-ignition coal gangue autoclaved aerated concrete

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Xinyu Cong ◽  
Yiqiu Tan ◽  
Shuang Lu ◽  
Zhaojia Wang ◽  
Tianyong Huang
Keyword(s):  
Water Absorption ◽  
Water Content ◽  
Frost Resistance ◽  
Coal Gangue ◽  
Calcium Stearate ◽  
Freeze Thaw ◽  
Foam Stabilizer ◽  
Autoclaved Aerated Concrete ◽  
Aerated Concrete ◽  
Resistance Performance

AbstractSelf-ignition coal gangue (SCG) used as one of precursors to fabricate autoclaved aerated concrete (AAC). Aiming at studying water absorptivity and frost resistance performance of SCG-based AAC (SCGAAC), three-period water absorption tests and freeze-thaw tests were carried out and the corresponding results were recorded and analyzed. In order to modify the water absorptivity of SCGAAC, foam stabilizer was applied to adjust pore structure while calcium stearate was expected to change hydrophilic feature of SCG. It was demonstrated that the compressive strength of SCGAAC containing foam stabilizer or calcium stearate declined at different levels. For water absorption, foam stabilizer failed to decrease the water content and even increased water absorption rates. Calcium stearate controlled water absorption rate successfully although the ultimate water content hardly reduced. All of the SCGAAC samples exhibited intact appearance after 50 freeze-thaw cycles and showed excellent frost resistance performance. Three models were proposed to predict water absorptivity and frost resistance performance of SCGAAC and the corresponding prediction results matched test resulted well.

Experimental Study on Freeze Thaw Resistance Concrete

2013 ◽  
Vol 830 ◽  
pp. 41-44
Author(s):  
Fu Yun Yang
Keyword(s):  
Experimental Study ◽  
Frost Resistance ◽  
Orthogonal Experiment ◽  
Research Experience ◽  
Range Analysis ◽  
Mixture Ratio ◽  
Factors Affecting ◽  
Freeze Thaw ◽  
Durability Of Concrete

In this paper, through the domestic and foreign research experience, the orthogonal experiment on some factors affecting the durability of concrete is designed. By range analysis the tests identify the effects of various factors on frost resistance, therefore this paper presents the optimum mixture ratio.

scholarly journals Study on Water Absorptivity and Frost Resistance Performance of Self-ignition Coal Gangue Autoclaved Aerated Concrete

2021 ◽  
Author(s):  
Xinyu Cong ◽  
Yiqiu Tan ◽  
Shuang Lu ◽  
Zhaojia Wang ◽  
Tianyong Huang
Keyword(s):  
Compressive Strength ◽  
Pore Structure ◽  
Water Content ◽  
Frost Resistance ◽  
Coal Gangue ◽  
Calcium Stearate ◽  
Foam Stabilizer ◽  
Aerated Concrete ◽  
Resistance Performance ◽  
Different Levels

Abstract Self-ignition coal gangue (SCG) used as one of precursors to fabricate aerated autoclaved concrete (AAC). Aiming at studying water absorptivity and frost resistance performance of self-ignition coal gangue aerated autoclaved concrete (SCGAAC), three-period water absorbing tests and freezing-thawing tests were carried out and the corresponding results were recorded and analyzed. In order to modify the water absorptivity of SCGAAC, foam stabilizer was applied to adjust pore structure while calcium stearate was expected to change hydrophilic feature of CG. It was demonstrated that the compressive strength of SCGAAC containing foam stabilizer or calcium stearate declined at different levels, although the porosity became lower slightly. For water absorptivity, foam stabilizer failed to decrease the water content at any period and even increased water absorbing rates. Calcium stearate controlled water absorbing rate successfully but the ultimate water content hardly reduced. All of the SCGAAC samples exhibited intact appearance after 50 freezing-thawing cycles and showed excellent frost resistance performance. Three models were proposed to predict water absorptivity and frost resistance performance of SCGAAC and the corresponding prediction results matched test resulted well.

scholarly journals Reactive Powder Concrete Mix Ratio and Steel Fiber Content Optimization under Different Curing Conditions

Materials ◽  
2019 ◽  
Vol 12 (21) ◽  
pp. 3615 ◽  
Author(s):  
Yunlong Zhang ◽  
Bin Wu ◽  
Jing Wang ◽  
Mo Liu ◽  
Xu Zhang
Keyword(s):  
Tensile Strength ◽  
Steel Fiber ◽  
Orthogonal Experiment ◽  
Fiber Content ◽  
Reactive Powder Concrete ◽  
Mixture Ratio ◽  
Curing Conditions ◽  
Compressive Performance ◽  
Binder Ratio ◽  
Reactive Powder

In this paper, a practical reactive powder concrete mixture ratio is created on the basis of an orthogonal experiment. Previous studies have combined the compressive and splitting tensile strengths of four categories of reactive powder concrete (RPC) for major materials. These categories include water/binder ratio, silica fume volume content, sand/binder ratio, and dosage of fly ash volume. The optimal mixing proportion of each factor was determined by analyzing the compressive strength of the RPC matrix. For this purpose, steel fiber was used as a reinforcing agent. The compressive and splitting tensile strength test results of steel fiber RPC were analyzed by comparing compound, standard, and natural curing. This was conducted to explore the improvement effect of different steel fiber contents on compressive performance, especially tensile strength of the RPC matrix. According to the results, the optimal steel fiber content was found to be 4% under the three curing conditions. The effect of compound curing on early strength was found to be greater in RPC than by natural or standard curing. However, the effect of late improvement is not obvious. Although standard curing is slightly stronger than natural curing, the performance under the latter can still meet engineering requirements.

Effect of Length-to-Diameter Ratio of Core Sample on Concrete Core Strength—Another Look

2008 ◽  
Vol 36 (1) ◽  
pp. 100573 ◽  
Author(s):  
M. R. Mitchell ◽  
R. E. Link ◽  
Omer Arioz ◽  
Kambiz Ramyar ◽  
Mustafa Tuncan ◽  
...  
Keyword(s):  
Core Sample ◽  
Diameter Ratio ◽  
Concrete Core ◽  
Core Strength ◽  
Length To Diameter Ratio
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