Study on the structure and properties of autoclaved aerated concrete produced with the stone-sawing mud

Wan, Huiwen; Hu, Yong; Liu, Gang; Qu, Yuan

doi:10.1016/j.conbuildmat.2018.06.214

Cited by 35 publications

(15 citation statements)

References 20 publications

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“…The dense and compact microstructure of AAC with waste resulted in an increase in strength despite the increase in the size of the macropores generated by the evolution of hydrogen ( Figure 4 ). These observations are consistent with some previous studies [ 37 , 39 , 40 ], where the formation of C–S–H phases with different microstructure and morphology was observed to have a significant effect on the compressive strength of AAC.…”

Section: Resultssupporting

confidence: 93%

Waste Originating from the Cleaning of Flue Gases from the Combustion of Industrial Wastes as a Lime Partial Replacement in Autoclaved Aerated Concrete

Różycka

Kotwica

2022

Materials

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This paper aims to study the suitability of partial replacement of lime by waste originating from the cleaning of flue gases from the combustion of industrial wastes in the production of autoclaved aerated concrete (AAC). The compressive strength, bulk density, pore structure, phase composition, and microstructure of hydration products of the AAC were analyzed. According to the results, the addition of the waste can effectively enhance the mechanical properties of AAC due to the differences in morphology of hydration product—1.1 nm tobermorite and related dense microstructure. The pore size distribution was significantly influenced by waste addition, which was one of the main reasons for the increase in thermal conductivity. The XRD and SEM results showed that foreign ions introduced with the wastes affect the synthesis of 1.1 nm tobermorite. Moreover, it was shown that waste containing a high content of CaO can be used as lime replacement, which allows reducing CO2 emissions during the AAC production process.

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Section: Resultssupporting

confidence: 93%

Waste Originating from the Cleaning of Flue Gases from the Combustion of Industrial Wastes as a Lime Partial Replacement in Autoclaved Aerated Concrete

Różycka

Kotwica

2022

Materials

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“…For 100% stone sawing mud, the pore distribution was uniform and also tobermorite crystallized leaf structure was present. The main hydration products were CSH and tobermorite; but CH was absent [16]. SEM micrographs of mortar consisting of marble powder showed that structure is not homogenous like control mix.…”

Section: Semmentioning

confidence: 90%

“…There was an insignificant difference in the hydration components in mixtures consisting of CWP and control mix [27]. XRD analysis of autoclaved aerated concrete (AAC) with 0% and 100% stone sawing mud as sand replacement showed that C-S-H was the major product that consists of tobermorite and also some amount of quartz which participates in hydration reaction partially [16]. CH, CSH, calcite, calcium silicate and aggregates in the form of quartz are the main components present in the mortar.…”

Section: Xrdmentioning

confidence: 99%

Micro-structural analysis of cement composites using stone waste: A review

Devi

Saini²,

Aggarwal³

2022

IOP Conf. Ser.: Mater. Sci. Eng.

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The direct disposal of industrial by-products to environment is the potential threat to the ecosystem. A possible solution can be utilization of these materials into construction industries to counteract the consumption of cement. Along with the strength and durability properties, study of micro-structural properties of concrete is equally important. The microstructure of concrete largely depends on the type of cement, admixtures, water-cement ratio and curing age. To characterize and quantify the hydration products i.e., calcium silicate hydrate, calcium hydroxide etc. of cement based materials, scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD) etc. techniques are being used worldwide. XRD is a powerful tool for the identification of chemical compounds present in the cement-based materials. SEM reveals the information about external morphology, chemical composition, crystalline structure and orientation of the material. EDS is an analytical technique that can be coupled with SEM and used to determine the elemental composition. A critical review of microstructural analysis using above mentioned techniques for mortar and concrete using stone waste has been done. It was found that these techniques are capable to address the morphological and crystalline structure along with chemical elements and compounds of the materials; and can also be correlated with strength and durability properties. The micrographs showed stone waste, being a filler material aid in forming the dense matrix by filling the voids. Elemental analysis coheres to the chemical compounds (calcium oxide, silica dioxide, etc.) present in the mortar and concrete specimens corresponding to micrographs images.

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“…Since the pore sizes of the SAAC composites ranged from 0.5 to 1.5 mm [24], therefore, the 750-µm-sized particles were suitable for the pore sizes of SAAC composites. This resulted in the improved compressive strength of composites [25]. The 750-µm-sized waste particles filled the pores, thereby protecting the pore structure of the SAAC.…”

Section: Effect Of the Particle Size Of Waste Tires On Physical Perfo...mentioning

confidence: 99%

Influence of Waste Tire Particles on Freeze–Thaw Resistance and Impermeability Performance of Waste Tires/Sand-Based Autoclaved Aerated Concrete Composites

et al. 2022

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Waste tires/sand-based autoclaved aerated concrete (SAAC) composites were prepared by mixing waste tires, which have different particle sizes and content. The physical performance, mechanical properties, freeze–thaw resistance, impermeability performance, phase composition, and microstructure of waste tires/sand-based autoclaved aerated concrete composite materials were examined. The results demonstrated that the 750-μm-sized waste tire particles on the surface of the SAAC composite did not agglomerate. Moreover, these particles did not damage the pore structure of the composites. The SAAC composites, with a relatively high compressive strength and low mass-loss rate, were obtained when the contents of waste tire particles ranged from 1.0 to 2.5 wt.%. For composites prepared with 2.0 wt.% of 750-μm-sized waste tire particles, the optimal compressive and flexural strength values were 3.20 and 0.95 MPa, respectively. The increase in the rate of water absorption on SAAC composites was lowest (i.e., 16.3%) when the soaking time was from 24 to 120 h.

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Study on the structure and properties of autoclaved aerated concrete produced with the stone-sawing mud

Cited by 35 publications

References 20 publications

Waste Originating from the Cleaning of Flue Gases from the Combustion of Industrial Wastes as a Lime Partial Replacement in Autoclaved Aerated Concrete

Waste Originating from the Cleaning of Flue Gases from the Combustion of Industrial Wastes as a Lime Partial Replacement in Autoclaved Aerated Concrete

Micro-structural analysis of cement composites using stone waste: A review

Influence of Waste Tire Particles on Freeze–Thaw Resistance and Impermeability Performance of Waste Tires/Sand-Based Autoclaved Aerated Concrete Composites

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