scholarly journals WATER ABSORPTION OF AUTOCLAVED AERATED CONCRETE MADE WITH THE USE OF FLY ASH

2020 ◽  
Vol 2020 (1) ◽  
pp. 151-152
Author(s):  
Viktoriya Bugaychuk ◽  
Al'bina Baranova
Keyword(s):  
Fly Ash ◽  
Water Absorption ◽  
Average Density ◽  
Autoclaved Aerated Concrete ◽  
Aerated Concrete ◽  
The Difference

The results of determining the water absorption of autoclaved gas-ash concretes grades on the average density of D500 and D600 are presented. During the work, it was found that the difference in water absorption between the studied brands by mass is 17.2 %, by volume - 5.3 %.

Carbonation of autoclaved aerated concrete containing fly ash

ce/papers ◽  
2018 ◽  
Vol 2 (4) ◽  
pp. 47-51 ◽  
Author(s):  
Bernd Winkels ◽  
Holger Nebel ◽  
Michael Raupach
Keyword(s):  
Fly Ash ◽  
Autoclaved Aerated Concrete ◽  
Aerated Concrete

Non-Autoclaved Aerated Concrete Porosity and Factors Affecting it

2020 ◽  
Vol 992 ◽  
pp. 218-227
Author(s):  
L.A. Suleymanova ◽  
Inna A. Pogorelova ◽  
K.A. Kara
Keyword(s):  
Cement Hydration ◽  
Total Porosity ◽  
Average Density ◽  
Initial Water Content ◽  
Hydration Degree ◽  
Initial Water ◽  
Factors Affecting ◽  
Autoclaved Aerated Concrete ◽  
Aerated Concrete ◽  
Average Size

The total volume of cellular porosity, which comprises pores, interpore partitions, and air-entrained pores, depends on the spatial packing of pores, size distribution, maximum and average size, their shape, and the thickness of interpore partitions. Interpore partitions contain gel and capillary pores, which have a significant impact on the total porosity, thus affecting the operating properties of aerated concrete. This paper presents the calculations of gel, capillary, air, and total porosity in non-autoclaved aerated concrete of average-density grades D100...D1200 for different cement hydration degrees (0.6; 0.8, and 1) and water-cement ratios (0.5; 0.6, and 0.7); calculations use the author-developed methodology. Cement consumption depends on the average-density grade as well as on cement hydration degree. Reducing the latter from 1 to 0.6 in D500 concrete raises cement consumption by 7.4 %; other grades have similar patterns. This is why aerated concrete should be conditioned to maximize the utilization of the binder by enabling its complete hydration. The amount of water in the mixture is what determines the cement consumption and the water-cement ratio, whereby the density of cement dough will not depend on the average-density grade provided that the hydration degree and the WC ratio are constant. The finding is that the ability of cement to form its own pore structure is crucial to D500 and D400 aerated concrete if the mixture has high initial water content.

Composite Binder for Structural Cellular Concrete

2019 ◽  
Vol 945 ◽  
pp. 53-58 ◽  
Author(s):  
M.Y. Elistratkin ◽  
E.S. Glagolev ◽  
M.V. Absimetov ◽  
V.V. Voronov
Keyword(s):  
Building Materials ◽  
Negative Impact ◽  
Average Density ◽  
Construction Costs ◽  
Competitive Situation ◽  
Composite Binder ◽  
Mineral Supplements ◽  
Autoclaved Aerated Concrete ◽  
Aerated Concrete ◽  
Cellular Concrete

Non-autoclaved aerated concrete is the only viable alternative to gas silicate when organizing its manufacture on the basis of regional small and medium capacity production. This aims to improvement the competitive situation on the building materials market and optimizing the construction costs. The possibility of expanding the application field of this material due to the increase in strength characteristics while maintaining an unchanged average density is of special interest. The guarantee of proposed solutions economic and technical efficiency is the transition from traditional portland cement to composite binders based on it. The article discusses the quantity and composition of the mineral supplements feasibility to optimize the binder properties of the problem peculiarities to reduce consumption of cement and chemical modifiers that increase the rate of curing and totals of non-autoclaved aerated concrete investigated compatibility issues between components to eliminate their negative impact on the formation of porous structure of the final product.

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 of new cementitious system using fly ash and dehydrated autoclaved aerated concrete

2014 ◽  
Vol 29 (4) ◽  
pp. 726-732 ◽  
Author(s):  
Zhonghe Shui ◽  
Jianxin Lu ◽  
Sufang Tian ◽  
Peiliang Shen ◽  
Sha Ding
Keyword(s):  
Fly Ash ◽  
Autoclaved Aerated Concrete ◽  
Aerated Concrete ◽  
Cementitious System

Influence of Fluidized Fly Ash on the Selected Physical-Mechanical Properties of the Autoclaved Aerated Concrete

2014 ◽  
Vol 899 ◽  
pp. 409-414 ◽  
Author(s):  
Alena Struhárová ◽  
Stanislav Unčík ◽  
Svetozár Balkovic ◽  
Mária Hlavinková
Keyword(s):  
Mechanical Properties ◽  
Fly Ash ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Amorphous Phases ◽  
Autoclaved Aerated Concrete ◽  
Aerated Concrete ◽  
Free Cao ◽  
Physical And Chemical ◽  
And Chemical Properties

Fluidized fly ash has different physical and chemical properties compared to fly ash emerging from classic combustion. It contains amorphous phases resulting from a dehydration of clay minerals as well as unreacted sorbent of CaCO3, free CaO and anhydrite (CaSO4). Work targets the possibilities of production of an autoclaved aerated concrete (AAC) from fluidized fly ash, and its influence on particular physical-mechanical properties of autoclaved aerated concrete.

scholarly journals FOR THE STUDY OF PECULIARITIES OF STRUCTURE FORMATION OF COMPOSITE BINDERS FOR NON-AUTOCLAVED AERATED CONCRETE

2020 ◽  
pp. 41-47 ◽  
Author(s):  
V. Lesovik ◽  
M. Absimetov ◽  
M. Elistratkin ◽  
S. Shatalova
Keyword(s):  
Structure Formation ◽  
Raw Materials ◽  
Stage Structure ◽  
Average Density ◽  
Strength Performance ◽  
Molding Mixture ◽  
Autoclaved Aerated Concrete ◽  
Wide Range ◽  
Mineral Additive ◽  
Aerated Concrete

the basis of the modern market of cellular concrete is autoclaved gas silicate. At the same time, non-autoclaved aerated concrete is largely a more technological material, allowing the variation of its properties within a wide range, having a potentially wider field of application, less costly in the organization of production, which is of great importance for small and medium-sized businesses. The main problem of non-autoclaved aerated concrete is a higher cost of raw materials compared to silicate, and 20...30% lower strength performance. The proposed solution to this problem is the development of special composite binders with a limited content of clinker and mineral additives of various genetic types, taking into account the peculiarities of the two-stage structure formation of the material – gas porization and the formation of the microstructure of the stone. The article deals with some aspects of the interaction in the system “mineral additive – gypsum – by-products of the gas release reaction” in terms of the effect on the viscosity of the swelling mass and the strength of the stone at different times of hardening. Recommendations are given on the preferred compositions of composite binders and dosages of gypsum in the molding mixture when producing a material with an average density in the range of 500...700 kg/m3.

Influence of Fly Ash Fineness on Autoclaved Energy Conservation Block's Performance and Hydration Products

2014 ◽  
Vol 599 ◽  
pp. 302-309 ◽  
Author(s):  
Bao Guo Ma ◽  
Li Xiong Cai ◽  
Shou Wei Jian ◽  
Lei Su
Keyword(s):  
Fly Ash ◽  
Microscopic Analysis ◽  
Production Performance ◽  
Strength Increase ◽  
Hydration Products ◽  
X Ray Diffraction ◽  
Electron Microscopic ◽  
Specific Strength ◽  
Autoclaved Aerated Concrete ◽  
Aerated Concrete

This article discussed the influence of FA fineness on the production performance and usability through the autoclaved aerated concrete slurry gas foaming curve and basic physical properties of blocks; meanwhile, studied the influence of different fineness FA on the composition and morphology of hydration products through X-ray diffraction analysis and scanning electron microscopic analysis, The results show that in the cement-fly ash-lime system autoclaved aerated concrete, the higher fineness of FA, the more water it need, and more sensitive the slurry presents; when the FA residue decrease from 17.8% to 8% through a 0.045mm square hole sieve screen, its specific surface area enlarge from 325m2/Kg to 388m2/Kg, the autoclaved aerated concrete specific strength increase by 53.24% and 40.96% in the case of the same ratio of water and resemble extended degree, respectively. Keep on increasing FA fineness does harm to its specific strength. The crystallinity of tobermorite, which is the main hydration products of autoclaved aerated concrete decreases with the increasing of FA fineness, however, crystallite size become larger.

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