Development of low drying shrinkage foamed concrete and hygro-mechanical finite element model for prefabricated building fasçade applications

Wan, Kai Tai; Zhu, Honggang; Yuen, Terry Y.P.; Chen, Binmeng; Hu, Chuanlin; Leung, Christopher Kin Ying; Kuang, Jingming

doi:10.1016/j.conbuildmat.2018.01.024

Cited by 22 publications

(13 citation statements)

References 49 publications

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“…This is consistent with the observation that smaller size of pores corresponds to higher density [9]. For example, Wan et al [82] obtained air-voids between 0.010 and 0.150 mm in diameter for foamed concrete with a density of 1500 kg/m 3 ; Hilal et al [14] achieved between approximately 0.02 and 2 mm for foamed concrete with nominal densities of 1300, 1600 and 1900 kg/m 3 ; and Sun et al [75] obtained air-voids of 0.517 mm for foamed concrete with a density of 600 kg/m 3 . At the same time, more large air bubbles of up to 3.5 mm in diameter were observed in higher densities; see Figure 6.…”

Section: Distribution Of Poressupporting

confidence: 92%

Characteristics of Lightweight Concrete Based on a Synthetic Polymer Foaming Agent

2020

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The components of foamed concrete have a significant effect on its properties. Protein-based foamed concrete is used much more often. This study aims to assess the properties of foamed concrete with a density of around 500, 700, 800 and 1000 kg/m3 formed by using a synthetic polymer-based foaming agent. The distribution of pores, wet and dry density and compressive strengths were evaluated. In addition, the creep deformations of foamed concrete with different densities were measured. The difference in density of up to 170 kg/m3 for the highest densities was obtained. Foamed concrete with higher densities (700 and 800 kg/m3) showed similar characteristics of pores, which were different from those of samples with a density of 500 kg/m3. Compressive strength equal to 5.9 ± 0.2, 5.1 ± 0.2, 3.8 ± 0.3 and 1.4 ± 0.2 MPa was obtained for foamed concrete with a density of 500, 700, 800 and 1000 kg/m3, respectively. The obtained compressive strengths were higher than those found in the literature for the foamed concrete with the same densities. With increasing density, smaller creep deformations were obtained. Creep deformations were 509, 495 and 455 με for samples with densities of around 500, 700 and 1000 kg/m3 respectively. Deformation under long-term loading took place up to 90 days, regardless of the density of the foamed concrete.

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Section: Distribution Of Poressupporting

confidence: 92%

Characteristics of Lightweight Concrete Based on a Synthetic Polymer Foaming Agent

2020

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“…One of the main disadvantages of foamed concrete is the high drying shrinkage that takes place at early ages [24,25]. Due to the absence of coarse aggregates in the foamed concrete, its drying shrinkage is about 4-10 times higher than that of traditional concrete [6].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Ultra-Lightweight Foamed Concrete Incorporating Lightweight Aggregates

et al. 2019

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Increasing interest is nowadays being paid to improving the thermal insulation of buildings in order to save energy and reduce ecological problems. Foamed concrete has unique characteristics and considerable potential as a promising material in construction applications. It is produced with a wide range of dry densities, between 600 and 1600 kg/m3. However, at a low density below 500 kg/m3, it tends to be unstable in its fresh state while exhibiting high drying shrinkage in its hardened state. In this study, lightweight aggregate-foamed concrete mixtures were prepared by the addition of preformed foam to a cement paste and aggregate. The focus of the research is the influence of fly ash, as well as fine lightweight aggregate addition, on the properties of foamed concrete with a density lower than 500 kg/m3. Concrete properties, including stability and consistency in the fresh state as well as thermal conductivity and mechanical properties in the hardened state, were evaluated in this study. Scanning electron microscopy (SEM) was used to study the microstructure of the foamed concrete. Several mixes with the same density were prepared and tested. The experimental results showed that under the same bulk density, incorporation of fine lightweight aggregate has a significant role on compressive strength development, depending on the characteristics of the lightweight aggregate. However, thermal conductivity is primarily related to the dry density of foamed concrete and only secondarily related to the aggregate content. In addition, the use of fine lightweight aggregate significantly reduces the drying shrinkage of foamed concrete. The results achieved in this work indicate the important role of lightweight aggregate on the stability of low-density foamed concrete, in both fresh and hardened states.

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“…Compared with the traditional building type, this building type greatly reduces the net weight of the building and improves the efficiency in construction. Its core purpose is to use the optimal design scheme to carry out the construction and assembly of building components in the shortest time, but correspondingly, In order to achieve the overall quality requirements, in the actual construction process, the building type must ensure that each building assembly component has a good running state, only in this way can the safety and quality of prefabricated buildings be ensured [16][17].…”

Section: Prefabricated Buildingsmentioning

confidence: 99%

Assembly Building Material Management Method Based on BIM Technology

2020

Preprint

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The primary goal of material management is to reasonably arrange the use of materials, which is particularly important for the construction industry. In the process of material management, on the premise of meeting the requirements of production and construction materials, try not to increase additional inventory and reduce the amount of capital. In order to explore the method of prefabricated building material management, this paper uses the method of sampling survey and sand table simulation technology to compare the prefabricated building material management based on BIM Technology with the conventional method. We make a comparative study on the procurement, warehouse and material quality of materials, mainly focusing on the production stage and construction stage of the building, and analyze the difference of material management between the two technical methods in different stages. Through experiments, we find that the average inventory turnover times of the BIM based prefabricated building materials management method is 6, and that of the conventional method is 4, but in the construction stage, the gap between the two is narrowed. The turnover times of the prefabricated building material management method based on BIM Technology is reduced to 3, and that of the conventional method is reduced to 2. It can be seen that the prefabricated building material management based on BIM Technology can reduce the capital use and warehouse occupancy rate more than the conventional method, and at the same time, the quality control of materials is also better.

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Development of low drying shrinkage foamed concrete and hygro-mechanical finite element model for prefabricated building fasçade applications

Cited by 22 publications

References 49 publications

Characteristics of Lightweight Concrete Based on a Synthetic Polymer Foaming Agent

Characteristics of Lightweight Concrete Based on a Synthetic Polymer Foaming Agent

Preparation and Characterization of Ultra-Lightweight Foamed Concrete Incorporating Lightweight Aggregates

Assembly Building Material Management Method Based on BIM Technology

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