Pms (Ch5sio3na) Assisted Activation and Modification of Alkali-Activated-Slag-Based Drying Powder Coating for Protecting Cement Concrete

2021 ◽  
Author(s):  
Xue-sen Lv ◽  
Yao Qin ◽  
Hang Liang ◽  
Yao-cong Han ◽  
Jing Li ◽  
...  
Keyword(s):  
Powder Coating ◽  
Cement Concrete ◽  
Alkali Activated Slag ◽  
Activated Slag ◽  
Alkali Activated

Effect of Curing Regime on the Properties of Alkali-Activated Slag/Limestone Mortar Subjected to High Temperatures

2016 ◽  
Vol 865 ◽  
pp. 37-41
Author(s):  
Barbora Fialová ◽  
Pavel Rovnaník
Keyword(s):  
Mechanical Properties ◽  
Positive Influence ◽  
Portland Cement Concrete ◽  
Cement Concrete ◽  
Alkali Activated Slag ◽  
Water Curing ◽  
Activated Slag ◽  
Curing Regime ◽  
Curing Regimes ◽  
Alkali Activated

Alkali-activated slag has a higher resistance against exposure to high temperature compared to ordinary Portland cement concrete. Nevertheless, its mechanical properties are also deteriorated due to partial decomposition of the C-A-S-H matrix. This paper investigates the effect of various curing regimes applied to the samples which were exposed to temperature 200–1200 °C on the mechanical properties and microstructure of the alkali-activated slag/limestone blends. The amount of limestone was 15% from the mass of slag. On set of specimens was treated on air at laboratory conditions, the second set was immersed in water and the last was treated stored in humid chamber with 95% relative humidity for the period of 60 days. The results showed that water curing has a strong positive influence on the compressive as well as flexural strength of the specimens exposed to temperatures up to 600 °C. Specimens which were exposed to 800 and 1000 °C showed the best performance after treatment in humid chamber, and after exposure to 1200 °C the best compressive strength exhibited the air cured samples.

scholarly journals Effect of Mixture Variables on Durability for Alkali-Activated Slag Cementitious

Materials ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2252 ◽  
Author(s):  
Chi-Che Hung ◽  
Yuan-Chieh Wu ◽  
Wei-Ting Lin ◽  
Jiang-Jhy Chang ◽  
Wei-Chung Yeih
Keyword(s):  
Portland Cement ◽  
Ordinary Portland Cement ◽  
Portland Cement Concrete ◽  
Cement Concrete ◽  
Chloride Permeability ◽  
Alkali Activated Slag ◽  
Binder Ratio ◽  
Activated Slag ◽  
Alkali Activated ◽  
Ordinary Portland Cement Concrete

In this study, the influence of three mixture variables named Sand/Aggregate ratio, Liquid/Binder ratio, and Paste/Aggregate ratio on the cementitious properties were studied. The durability of cementitious including absorption, absorption rate, resistivity, rapid chloride permeability index, and carbonation rate were examined. Results showed that the alkali-activated slag cementitious has superior durability. The trends of influences on the composites properties for these three mixture variables are similar to those for the ordinary Portland cement concrete. It means that the experiences for making the ordinary Portland cement concrete should be able to be used for the alkali-activated slag cementitious. This paper also provides a lot of data for the alkali-activated slag cementitious for future development of the mix design.

Modeling a Thermo-Stressed State of the Cast-in-Situ Low Carbon Footprint Alkali Activated Slag Cement Concrete Hardened under Hot Environment

2014 ◽  
Vol 525 ◽  
pp. 482-490
Author(s):  
Lu Qian Weng ◽  
Hai Lin Cao ◽  
Pavel V. Krivenko ◽  
Yue Guo ◽  
O.N. Petropavlovsky ◽  
...  
Keyword(s):  
Stressed State ◽  
Carbon Footprint ◽  
Low Carbon ◽  
Cement Concrete ◽  
Slag Cement ◽  
Alkali Activated Slag ◽  
Hot Environment ◽  
Activated Slag ◽  
Alkali Activated

Alkali activated slag cement concretes are low carbon footprint building mateirals, which can meet the requirements for sustainable development. The paper covers the results of modeling a thermo-stressed state of the cast-in-situ massive alkali activated slag cement concrete structure hardened under hot environment to meet the requirements for marine engineering application. The results show that alkali activated slag cement concretes have a substantially lower heat release than that of Portland, are suitable for cast-in-situ massive alkali activated slag cement concrete structure even under hot environment.

Research Progress on Carbonation Resistance of Alkali-Activated Slag Cement Concrete

2021 ◽  
Vol 1036 ◽  
pp. 347-357
Author(s):  
Lan Fang Zhang ◽  
Liu Yang ◽  
Bin Hong Fu ◽  
Yu Yue
Keyword(s):  
Influencing Factors ◽  
Test Methods ◽  
Research Progress ◽  
Cement Concrete ◽  
Slag Cement ◽  
Alkali Activated Slag ◽  
Carbonation Process ◽  
Carbonation Resistance ◽  
Activated Slag ◽  
Alkali Activated

The carbonation process in alkali-activated slag cement concrete is more complicated. This paper reviews the research progress of carbonation resistance of alkali-activated slag cement concrete at home and abroad and summarizes the existing research on carbonation. The focus is on the carbonation mechanism, test methods, influencing factors and the effect of carbonation on the performance of alkali-activated slag cement concrete. The problems existing in the current research on the anti-carbonation property of alkali-activated slag cement concrete and the issues for further research are proposed.

scholarly journals ENHANCEMENT OF STEEL REINFORCEMENT PROPECTION IN ALKALI-ACTIVATED SLAG CEMENT CONCRETE MIXED WITH SEAWATER

2021 ◽  
pp. 67-76
Author(s):  
P.V. Krivenko ◽  
◽  
І.І. Rudenko ◽  
О.P. Konstantynovskyi ◽  
О.V. Boiko ◽  
...  
Keyword(s):  
Portland Cement ◽  
Calcium Aluminate ◽  
Steel Reinforcement ◽  
Reinforcement Corrosion ◽  
Cement Concrete ◽  
Chemical Binding ◽  
Alkali Activated Slag ◽  
Activated Slag ◽  
Aluminate Cement ◽  
Alkali Activated

Modern trends in construction industry in terms of efficient use of raw materials and energy, implying a responsible attitude to environment, predetermine application of alkali-activated slag cement concrete (further, AASC concrete). It’s well-known the increased risk of steel reinforcement corrosion is caused by mixing concretes with seawater, presented by chlorides and sulfates. One of the benefits of AASC concrete is possibility to be mixed with seawater. The aim of this research was the enhancement of AASC concrete’s protective properties, mixed with seawater, to steel reinforcement due to modification by complex of additives (further, CA), including portland cement, calcium aluminate cement and clinoptilolite. Kuzel’s salt (3CaO∙Al2O3∙0,5CaCl2∙0,5SO4∙10H2O) was fixed in hydration products of AASC, modified by proposed CA, after 180 d of hydration. Formation of mentioned salt is due to chemical binding of Cl- and SO42- ions by calcium hydroaluminate 3CaO∙Al2O3∙10H2O, formed by co-acting of Portland cement and calcium aluminate cement during hydration process. Clinoptilolite enhances occlusion function of hydrates presented by alkaline hydro-alumina-silicates. State of steel reinforcement, evaluated according to DSTU B V.2.6-181:2011, confirms the effectiveness of CA in plasticized AASC concrete, mixed with seawater. Mass loss of steel rebars, which were reached from AASC concrete, modified by high-plasticizing additive of sodium lignosulphonate, was in compliance with mandatory requirements (no more than 10 g/m2). This fact is evidence of corrosion absence. Obtained results confirm mitigation of steel reinforcement corrosion risk in plasticized AASC concrete, modified by CA and mixed with seawater. This phenomenon is caused by binding of Cl- and SO42- ions due to chemical adsorption by gel-like phases, chemical binding in Kuzel`s salt as well as their occluding by zeolite-containing admixture and alkaline hydro-alumina-silicates. In addition, increased strength of AASC concrete, while mixing with seawater, is caused by both water-reducing effect of salts of strong acids and densification of artificial stone microstructure under their influence.

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