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.

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.

Study on Production of Autoclaved Aerated Concrete by Coal Gangue Fly Ash

2013 ◽  
Vol 357-360 ◽  
pp. 949-954
Author(s):  
Ye Zhang ◽  
Peng Xuan Duan ◽  
Bao Sheng Jia ◽  
Lei Li
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Drying Shrinkage ◽  
Coal Gangue ◽  
National Standards ◽  
Raw Material ◽  
Autoclaved Aerated Concrete ◽  
Binder Ratio ◽  
Material Formulation ◽  
Aerated Concrete

In this paper, the low-silicon coal gangue fly ash is used to produce autoclaved aerated concrete. The influences of water binder ratio, coal gangue fly ash content, calcareous content and conditioning agents on the compressive strength of the autoclaved aerated concrete are investigated. Optimal raw material formulation and procedure are determined for the autoclaved aerated concrete. The compressive strength and frost resistance of autoclaved aerated concrete made by the optimal raw material formulation and procedure meet with the requirements of autoclaved aerated concretes of B05 grade, and its thermal conductivity, drying shrinkage reach the requirements of the relevant national standards of China.

Preparation and properties of autoclaved aerated concrete using coal gangue and iron ore tailings

2016 ◽  
Vol 104 ◽  
pp. 109-115 ◽  
Author(s):  
Chang-long Wang ◽  
Wen Ni ◽  
Si-qi Zhang ◽  
Shuang Wang ◽  
Guo-sheng Gai ◽  
...  
Keyword(s):  
Iron Ore ◽  
Coal Gangue ◽  
Autoclaved Aerated Concrete ◽  
Iron Ore Tailings ◽  
Aerated Concrete

A Comparative Study on Production of Autoclaved Aerated Concrete by Coal Gangue Fly Ash

2013 ◽  
Vol 395-396 ◽  
pp. 433-438 ◽  
Author(s):  
Ye Zhang ◽  
Peng Xuan Duan ◽  
Bao Sheng Jia ◽  
Lei Li
Keyword(s):  
Fly Ash ◽  
Ash Content ◽  
Coal Gangue ◽  
Raw Material ◽  
Autoclaved Aerated Concrete ◽  
Binder Ratio ◽  
Material Formulation ◽  
Aerated Concrete ◽  
The Common ◽  
Water Binder Ratio

In this paper, compared with common fly ash, the low-silicon coal gangue fly ash is used to produce fly ash autoclaved aerated concrete. The influences of water binder ratio, coal gangue fly ash content, calcareous content and conditioning agents on the compressive strength of the autoclaved aerated concrete are investigated. The results indicate the coal gangue fly ash has different properties from the common fly ash such as its granule appearance and the activity as AAC siliceous raw material. It is noting that the coal gangue fly ash can also be used to prepare AAC blocks by optimizing the raw material formulation and procedure and its B05 product can reach the China top industrial standard.

Mix Ratio Test and Basic Property Analysis for Autoclaved Aerated Concrete (AAC) Block

2012 ◽  
Vol 446-449 ◽  
pp. 508-512
Author(s):  
Ze Wu Fu ◽  
San Hai Zeng
Keyword(s):  
Water Absorption ◽  
Absorption Rate ◽  
Total Porosity ◽  
Concrete Block ◽  
Ratio Test ◽  
Water Absorption Rate ◽  
Autoclaved Aerated Concrete ◽  
Aerated Concrete ◽  
Ratio Optimization ◽  
Production Demand

Through the mix ratio optimization test, the appropriate autoclaved aerated concrete block may be prepared for the production demand, whose technical indexes could satisfy the requirement of national specification. Furthermore, in the light of the research on the property of autoclaved aerated concrete block for this mix ratio, the strength of concrete block would decrease with the increase of total porosity among the pore diameter from 0.5mm to 1.5mm. The autoclaved aerated concrete block possessed the strong capability of absorbing water, so the volume water absorption rate increased quickly at first and then went down furiously, which could make the shrinkage of autoclaved aerated concrete block augment because of the decrease of its water absorption rate.

scholarly journals Frost Resistance Number to Assess Freeze and Thaw Resistance of Non-Autoclaved Aerated Concretes Containing Ground Granulated Blast-Furnace Slag and Micro-Silica

Materials ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4151
Author(s):  
Eldar Sharafutdinov ◽  
Chang-Seon Shon ◽  
Dichuan Zhang ◽  
Chul-Woo Chung ◽  
Jong Kim ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Frost Resistance ◽  
Blast Furnace Slag ◽  
Autoclaved Aerated Concrete ◽  
Granulated Blast Furnace Slag ◽  
Freeze And Thaw ◽  
Aerated Concrete ◽  
Micro Silica ◽  
Furnace Slag ◽  
Scaling Resistance

Aerated concrete (AC), such as cellular concrete, autoclaved aerated concrete (AAC), and non-autoclaved aerated concrete (NAAC), having excellent insulation properties, is commonly used in buildings located in cold regions, such as Nur-Sultan in Kazakhstan, the second coldest capital city in the world, because it can contribute to a large energy saving. However, when the AC is directly exposed to the repeated freeze and thaw (F-T) cycles, its F-T resistance can be critical because of lower density and scaling resistance of the AC. Moreover, the evaluation of the F-T resistance of the AC based on the durability factor (DF) calculated by using the relative dynamic modulus of elasticity may overestimate the frost resistance of the AC due to the millions of evenly distributed air voids in spite of its weak scaling resistance. In the present study, the F-T resistance of NAAC mixtures with various binary or ternary combinations of ground granulated blast-furnace slag (GGBFS) and micro-silica was assessed mainly using the ASTM C 1262/C1262M-16 Standard Test Method for Evaluating the Freeze-Thaw Durability of Dry-Cast Segmental Retaining Wall Units and Related Concrete Units. Critical parameters to affect the F-T resistance performance of the NAAC mixture such as compressive strength, density, water absorption, air–void ratio (VR), moisture uptake, durability factor (DF), weight loss (Wloss), the degree of saturation (Sd), and residual strength (Sres) were determined. Based on the determined parameter values, frost resistance number (FRN) has been developed to evaluate the F-T resistance of the NAAC mixture. Test results showed that all NAAC mixtures had good F-T resistance when they were evaluated with DF. Binary NAAC mixtures generally showed higher Sd and Wloss and lower DF and Sres than those of ternary NAAC mixtures. It was determined that the Sd was a key factor for the F-T resistance of NAAC mixtures. Finally, the developed FRN could be an appropriate tool to evaluate the F-T resistance of the NAAC mixture.

scholarly journals Properties and Hydration Mechanism of Autoclaved Aerated Concrete Containing Coal Gangue and Fly Ash

2019 ◽  
Vol 22 (4) ◽  
pp. 231-238
Author(s):  
Jun Li ◽  
Zhaojia Wang ◽  
Kaifan Zhang ◽  
Changlong Wang ◽  
Xiaowei Cui
Keyword(s):  
Fly Ash ◽  
Coal Gangue ◽  
Hydration Mechanism ◽  
Autoclaved Aerated Concrete ◽  
Aerated Concrete
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