Effect of Curing Method on the Strength Development and Freezing-Thawing Durability of the Concrete Incorporating High Volume Blast-Furnace Slag Subjected to Initial Frost Damage

2012 ◽  
Vol 602-604 ◽  
pp. 962-967 ◽  
Author(s):  
Kyung Taek Koh ◽  
Gum Sung Ryu ◽  
Jang Hwa Lee
Keyword(s):  
Blast Furnace Slag ◽  
High Volume ◽  
Frost Damage ◽  
Strength Development ◽  
Term Strength ◽  
Water Curing ◽  
Early Strength ◽  
Curing Method ◽  
Furnace Slag

In the case of construction with high volume blast-furnace slag(BFS) concrete during winter season, the setting and hardening are drastically delayed, so it has a high risk of initial frost. Assuming that the concrete incorporating a high volume of BFS is affected by freezing at the early age during the winter conditions, then this study is to investigate the effect of curing method on the strength development and the resistance to freezing-thawing action. As a result, the concrete performing water curing at 5°C after subjected to initial frost damage improve the long-term strength and the freezing-thawing durability. The concrete implementing water curing at 30°C enhance the long-term strength and the resistance to freezing-thawing action as well as the early strength. However, the concrete with sealed curing at 30°C exhibits the improvement in the early strength, but not in the long-term strength and the freezing-thawing durability.

Evaluation on the Compressive Strength of Concrete Incorporating High Volume Blast-Furnace Slag Subjected to Initial Frost Damage

2011 ◽  
Vol 121-126 ◽  
pp. 2440-2444 ◽  
Author(s):  
Kyung Taek Koh ◽  
Gum Sung Ryu ◽  
Ki Hong Ahn ◽  
Chun Jin Park ◽  
Jang Hwa Lee
Keyword(s):  
Compressive Strength ◽  
Blast Furnace ◽  
Blast Furnace Slag ◽  
High Volume ◽  
Frost Damage ◽  
Early Age ◽  
Term Strength ◽  
Water Curing ◽  
Furnace Slag

Construction works that uses concrete incorporating a high volume of blast-furnace slag (BFS) during the winter season increases the risk of being subjected to initial frost damage as it noticeably delays setting and hardening. Assuming that the concrete incorporating a high volume of BFS was affected by freezing at an early age during the winter conditions, this study is to investigate the effect of strength degradation by early freezing and curing methods on compressive strength. As a result, freezing at early age highly degraded the compressive strength regardless of the types of concrete. After influenced by initial frost damage, water curing at 5°C improved the long-term strength and water curing at 30°C enhanced the long-term strength as well as the early strength.

scholarly journals Application of the High Early Strength Type Expansive Agent to the Blast Furnace Slag Combination Concrete with GGBFS under Steam Curing

2019 ◽  
Vol 278 ◽  
pp. 01005
Author(s):  
Erica Enzaki ◽  
Takashi Sakuma ◽  
Eizou Takeshita ◽  
Shigeyuki Date
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Early Stage ◽  
Precast Concrete ◽  
Curing Temperature ◽  
Strength Development ◽  
Steam Curing ◽  
Expansive Agent ◽  
Early Strength ◽  
Furnace Slag

In recent years, the use of blast furnace slag material is being focused as environmental loading reduction and sustainable construction. However, in general, autogeneours shrinkage of the concrete using much amount of GGBFS is large in compared to normal concrete, therefore risk of cracking should be cared. On the other hand, strength development speed of concrete at early stage will be decreasing as the dosage of GGBFS increases, even under steam curing condition. It can be considered these points will be significant disadvantage in both productivity and quality of precast concrete. So in this study, early strength type expansive agent and setting accelerator were used in combination. As a result, it was confirmed that compressive strength at early stage is obviously increased. And steam curing temperature can be reduced about 10 degrees, and also, 600×10-6 of restraint expansion was obtained.

Study on the Strength of Sea Sand Concrete in Ningbo

2011 ◽  
Vol 250-253 ◽  
pp. 262-265
Author(s):  
Jun Zhe Liu ◽  
Guo Liang Zhang ◽  
Jian Bin Chen ◽  
Zhi Min He
Keyword(s):  
Fly Ash ◽  
Influence Factor ◽  
Concrete Strength ◽  
Chloride Ion ◽  
Strength Development ◽  
Term Strength ◽  
Two Phase ◽  
Sea Sand ◽  
Early Strength

This paper mainly explain and expounded folding compressive strength of the different types of sea sand mortar , fly ash to the sea sand concretes mortar intensity influence as well as the chloride ion content to the sea sand concretes mortar intensity influence. The pulverized fly ash has the postponement function to the sea sand concretes early strength, the chloride ion has the promoter action to the sea sand concretes early strength. 20% pulverized fly ash be good to the sea sand concretes long-term strength development influence, can achieve the goal which enhances the sea sand concretes the long-term strength . The chloride ion is greater to the concretes early strength influence, especially in previous 3 days. Along with the time development, the chloride ion influence weakens, but the pulverized fly ash enlarges to the concretes intensity's influence factor. A two-phase arrived, the final concrete strength values close to each other.

scholarly journals Early Strength Development of Soft Clay Stabilized by One-Part Ground Granulated Blast Furnace Slag and Fly Ash-Based Geopolymer

2021 ◽  
Vol 8 ◽  
Author(s):  
Xiyao Zheng ◽  
Jun Wu
Keyword(s):  
Blast Furnace ◽  
Fly Ash ◽  
Blast Furnace Slag ◽  
Soft Clay ◽  
Strength Development ◽  
Granulated Blast Furnace Slag ◽  
Binder Ratio ◽  
Early Strength ◽  
Furnace Slag ◽  
Water Binder Ratio

One-part or “just add water” geopolymer is a cementitious material, which is friendly to environment and users in applications. However, the mechanical behavior of the soft soil stabilized by one-part geopolymer is not well acknowledged. In this study, soft clay was stabilized with ground granulated blast furnace slag (GGBFS) and fly ash (FA)-based geopolymer, which is a mixture of solid aluminosilicate precursor (Al-Si raw materials: GGBFS and FA), solid alkali activator, and water. The objective was to adopt one-part geopolymer as an alternative soil binder to completely replace ordinary Portland cement (OPC) for stabilizing the soft clay and evaluate the effect of the factors (i.e., GBFS/FA ratio in Al-Si precursor, activator/Al-Si precursor ratio, and water/binder ratio) that influenced the early strength. Results showed that the increase of the FA content in the Al-Si precursor increased the unconfined compressive strength (UCS) values significantly through the geopolymerization process. The highest UCS values were achieved with 90% GGBFS to 10% FA in the precursor when the activator/precursor and water/binder ratio is 0.15 and 0.7, respectively. The UCS values of geopolymer-stabilized clay could reach 1.5 MPa at 14 days at ambient temperature, which is much higher than that of OPC-stabilized clay. The microstructure and mineralogy analyses indicated that the prolific hydration products, such as calcium silicate hydrate (C-S-H), calcium aluminum hydrate (C-A-H), and calcium aluminum silicate hydrate (C-A-S-H), contributed greatly to strengthen the soft clay by forming the soil skeleton and infilling among clay particles, while sodium aluminosilicate (N-A-S-H) gel is only served to fill the part of porosities in the soil and cannot effectively enhance the UCS of the one-part geopolymer-stabilized soft clay. This paper results suggested that one-part GGBFS-FA–based geopolymers have the potential to replace OPC in the manufacture of stabilized soft clay.

Physical and Mechanical Characteristics of Non-Clinker Slag Cement Concretes

2012 ◽  
Vol 482-484 ◽  
pp. 1566-1569
Author(s):  
Yi Qin
Keyword(s):  
Blast Furnace Slag ◽  
Mechanical Characteristics ◽  
Cement Concrete ◽  
Slag Cement ◽  
Water Quench ◽  
Early Strength ◽  
Furnace Slag ◽  
Better Than ◽  
Physical And Mechanical Characteristics

The performance of non-clinker slag cement concretes depends on the alkalinity of water quench blast furnace slag, the chemical composition, the rate of vitrification and the type and quantity of excitant. Non-clinker slag cement concretes was prepared with phosphorus gypsum as the excitant. by using the method compare with ordinary cement concrete（OPC）,We test strength and the bond strength of reinforced. The result showing, the Workability of NSC is better than OPC, the early strength lies in the ettringite and Approaching OPC. The long-term intensity lies in the C-S-H and Far more than OPC.

Investigation on Basic Properties of Rice Husk Ash – Blast Furnace Slag Composite Binder

2014 ◽  
Vol 919-921 ◽  
pp. 2071-2075
Author(s):  
Jin Zha ◽  
Jin Hui Li ◽  
Yun Pan Jiao ◽  
Shao Hao Zhou
Keyword(s):  
Blast Furnace ◽  
Rice Husk ◽  
Blast Furnace Slag ◽  
Rice Husk Ash ◽  
Term Strength ◽  
Composite Binder ◽  
Basic Properties ◽  
Appropriate Treatment ◽  
Furnace Slag

This paper studies the changes of composite binder basic properties caused by the addition of processed rice husk ash and blast furnace slag. Experimental results show that the fineness and pozzolanic activity of rice husk ash, slag in appropriate treatment are according to using standard. This novel composite binder becomes a little worse in availability performance, while its long-term strength is equivalent with normal cement.

scholarly journals 41 Year Long-Term Durability of High Volume Blast-Furnace Slag Cement Concrete

2021 ◽  
Vol 19 (3) ◽  
pp. 248-258
Author(s):  
Manabu Hashimoto ◽  
Kazuhide Kurata ◽  
Yusuke Ohtsuka ◽  
Yasuhiro Dan
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
High Volume ◽  
Cement Concrete ◽  
Slag Cement ◽  
Furnace Slag
Sign in / Sign up

Export Citation Format

Share Document