Papers by Keyword: Foam Concrete

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Authors: De Ping Chen, Jing Yu Liu, Min Liu
Abstract: Carbonation curing was adopted to accelerate the hydration of foam concrete with lower density of around 450 kg/m3. After standard curing in mold for 2d, the foam concrete samples were marked into two groups. The first one is directly cured in ‘Carbonation Test Chamber for Concrete’ with CO2 concentration 20%, RH 70% and temperature 20°C (it was called ‘carbonation curing’) for 3d to 56d. The second one is cured in ‘Standard Curing Room for Concrete’ with RH ≥95% and temperature 20°C (it was called ‘standard curing’) for 7d, and then at carbonation curing for 3d, 7d and 21d. The strengths of harden foam concrete were tested, the hydration products were analyzed by means of XRD and TG/DSC. The results were compared with those of standard curing samples. It indicates that foam concrete with lower density is easier to be carbonated; the hydration of both C3S and C2S accelerates by carbonation curing, which results in higher early strength improvement. Vaterite is popular in the second group of samples, while it only appears in the first group of sample with longer carbonation time of 56d. Vaterite was considered to be formed from the further carbonation of CxSHy.
172
Authors: Jin Young Choi, Han Seung Lee, Byung Kwon Lee
Abstract: The purpose of this study is to obtain basic data on the properties of the development of lightweight concrete containing a foam agent for various applications. This experiment confirmed that compressive strength increased specific gravity, by changing the foam agent into a variable and measuring the compressive strength of concrete.
469
Authors: Nur Fitriah Isa, Mohd Zulham Affandi Mohd Zahid, Liyana Ahmad Sofri, Norrazman Zaiha Zainol, Muhammad Azizi Azizan, Muhammad Munsif Ahmad, Mohd Badrul Hisyam Ab Manaf, Mohd Faiz Mohammad Zaki, Mustaqqim Abdul Rahim, Zuhayr Md Ghazaly
Abstract: In order to promote the efficient use of composite materials in civil engineering infrastructure, effort is being directed at the development of design criteria for composite structures. Insofar as design with regard to behavior is concerned, it is well known that a key step is to investigate the influence of geometric differences on the non-linear behavior of the panels. One possible approach is to use the validated numerical model based on the non-linear finite element analysis (FEA). The validation of the composite panel’s element using Trim-deck and Span-deck steel sheets under axial load shows that the present results have very good agreement with experimental references. The developed finite element (FE) models are found to reasonably simulate load-displacement response, stress condition, giving percentage of differences below than 15% compared to the experimental values. Trim-deck design provides better axial resistance than Span-deck. More concrete in between due to larger area of contact is the factor that contributes to its resistance.
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Authors: Min Liu, De Ping Chen, Jing Yu Liu
Abstract: Carbon dioxide curing was adopted to accelerate the hydration of foam concrete samples with a lower bulk density level of around 450 kg/m3 and a higher level of around 1150 kg/m3. The bending strength, compressive strength and ultrasonic transmission velocity of carbonated harden foam concrete were tested, the hydration products were analyzed by means of XRD and TG/DSC. The results show as: (1) By comparing with standard curing samples, there are more than 47% increments of specific strengths of carbonated foam concrete with the higher density level at a certain curing time before 14d. However, for the lower density level one, there is just a significant improvement of specific bending strength obtained before 7d. (2) The carbonated foam concretes with the lower density level show lower ultrasonic transmission velocity than standard curing ones. The velocities have hardly difference for both carbonated and standard curing samples with the higher density level. (3) Vaterite can’t be found in carbonated foam concrete with the lower density level at curing time before 28d, while it becomes a common phase in 3d’s carbonated sample with the higher density level. Vaterite was considered to be an important factor that influences the ultrasonic transmission velocity.
1764
Authors: Xiao Lei Xu, De Cheng Zhang, Fu Tian Liu
Abstract: This paper studied the lightweight ceramsite, thickener and waterproofing agent dosage on the influence of the foam concrete water absorption and strength, and further researched into the amount of foaming agent on the influence of the density and strength. The results show that adding 20% ceramic, 0.03% thickening agent and 1% waterproof agent prepared the best performance of foam concrete.
400
Authors: Cheng Cheng Yu, De Ling Wang, Kang Yang, Shu Lei Li
Abstract: The effect of rice husk ash (RHA) on foam concrete was studied. Firstly, performance and application of foam concrete was introduced in this paper. Secondly the character of RHA was described. RHA contains about 90% amorphous silica, which has high pozzolanic activity. Partial replacement of cement by RHA can enhance the strength of foam concrete in later age and improve durability, homogeneity and corrosion resistance. It also improves the pore structure of foam concrete, thermal insulation and sound absorption performance. Finally, development of foam concrete mixed with RHA was analyzed from following aspects: selecting and processing materials such as foaming agents, RHA and cement; optimizing production process of foam concrete. And since RHA is the major agricultural by-products of rice, it can reduce cost and environmental impact by replacing cement in foam concrete. As an environment friendly material, foam concrete cooperating RHA has great potential in construction field.
901
Authors: Yan Da Cai, Jing Song Wang, Yun Feng Luo, Wen Wu Long, Xiao Feng Yang, Feng Zhu
Abstract: 400kg/m3 apparent density foam concrete consists of protein foaming agent, ordinary Portland cement and two types of polypropylene fibers is made in this study. The effects of two types of fibers (polypropylene linear fiber and polypropylene mesh fiber) on the compressive strength, flexural strength and water absorption of the foam concrete were investigated. The results showed the difference of the water absorption of the foam concrete with addition of the two types of fibers is not significant, but the difference of the compressive strength and flexural strength is clear. Moderate addition of fibers could improve the strength of the foam concrete. As compared with control, the compressive strength and flexural strength increased by as high as 60.7% and 71.2%, respectively. From the experimental results, it is clear that polypropylene linear fiber has advantage of compressive strength and flexural strength over polypropylene mesh fiber when mixed with foam concrete.
156
Authors: Cai Lin Liu, Yu Rong Zhang, Hai Jun Yang, Xian Yan Ren, Jun Xiao Yang
Abstract: A lauramide concrete foaming agent was prepared by a simple synthetic route using readily available N-(2-hydroxyethyl)ethylenediamine, dodecanoic acid, and chloroacetic acid. The reaction conditions were optimized by changing reaction temperature, reaction time, and/or molar ratios of reactants. Significantly, the concrete foaming agent has very low surface tension and good foaming properties, which could be directly used without purification and has widely applicable potentials in low-density foam concrete.
799
Authors: Che Ping Wu, Xin Gang Yu, Yan Na Gao, Huaan Xiao, De Jun Li, Shi Song Luo
Abstract: The effect of the fly ash content on the properties of the fly ash-coal gangue foam concrete was studied in this paper. Results revealed that: With the increase of the fly ash content, the dry density, the compressive strength and the shrinkage of the fly ash-coal gangue foam concrete decrease; the density of the fly ash - coal gangue foam concrete was influenced greatly by the ratio of water to total dry material. The pore structure and microstructure of the foam concrete was analyzed by scanning electron microscopy, and the results show that most of the pores are fine, closed, and even distributed.
366
Authors: Qing Wang, Lin Ge Qiu, Qi Yao, Zhao Yang Ding, Xi Fan Yan
Abstract: Dry density and compression strength of foam concrete are conflicting, there is a negative relationship between them. Hollow glass microsphere is a new lightweight material which is lightweight, high strength, low thermal conductivity and good thermal stability. In order to prepare lightweight and high-strength foam concrete, this paper researched the effects of different dosage on dry density and compressive strength of foam concrete through adding hollow glass microspheres. The results show that the thermal conductivity of foam concrete increased as the hollow glass microsphere increases, and the dry densities of foam concrete are between 120-200 kg•m-3, compressive strength reaches 0.1MPa.
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