scholarly journals Combustibility of lightweight foam concrete based on natural protein foaming agent

2021 ◽  
Vol 264 ◽  
pp. 05001
Author(s):  
Vladimir Rybakov ◽  
Anatoly Seliverstov ◽  
Kseniia Usanova ◽  
Iroda Rayimova
Keyword(s):  
Evaluation Criteria ◽  
Foam Concrete ◽  
Sample Mass ◽  
Foaming Agent ◽  
Natural Protein ◽  
Temperature Increment ◽  
Concrete Temperature ◽  
Floor Structure ◽  
Stable Flame ◽  
Lightweight Foam

There is an experimental study of samples of monolithic foam concrete “SOVBI” with a density of 205 kg /m3 (grade D200) for combustibility. The evaluation criteria are the following values of combustion characteristics: temperature increment in the furnace, duration of the stable flame burning, sample mass loss. The experimental results show the following values for foam concrete: temperature increment in the furnace of 2 °C, duration of the stable flame burning of 0 s, and sample mass of 24.4%. Thus, monolithic foam concrete with a density of 205 kg/m3 is noncombustible material. It is proposed to use monolithic foam concrete and other lightweight monolithic cellular foam concrete, as a structural fire protection for lightweight steel concrete structures. It, in turn, can increase the fire resistance of external walls and floor structure with the steel frame of cold-formed zinc-coated profiles.

scholarly journals EFFECT OF FOAMING AGENT IN SELF CONSOLIDATING LIGHTWEIGHT CONCRETE (SCLC)

2019 ◽  
Vol 81 (4) ◽  
Author(s):  
Mohd Afiq Mohd Fauzi ◽  
Ahmad Ruslan Mohd Ridzuan ◽  
Nurliza Jasmi ◽  
Mohd Fadzil Arshad ◽  
Mohd Shafee Harun
Keyword(s):  
Compressive Strength ◽  
Lightweight Concrete ◽  
Foam Concrete ◽  
Concrete Technology ◽  
Normal Concrete ◽  
Conventional Concrete ◽  
Foaming Agent ◽  
Self Consolidating Concrete ◽  
Strength Performance ◽  
Lightweight Foam

Self-Consolidating Lightweight Concrete (SCLC) is relatively a new concept and can be regarded as a revolutionary development in the field of concrete technology. It is a type of concrete that might not require vibration for placing it and could be produced by reducing the density of concrete. However, the density of normal Self Consolidating Concrete (SCC) is similar to normal concrete approximately 2400kg/m3. By using foaming agent, the density of concrete can be reduced up to 1800kg/m3. Due to the heavy density of concrete, it will give the initial higher supply cost over conventional concrete, has slowed down its application to general construction. It is also hard to handle for construction and transportation. Therefore, it is advantages to produce SCC with lower density to provide benefit and enhancement of its performance by a combination of two types of concrete technology that is SCC technology and Lightweight Foam Concrete technology. This paper was focused to identify the effect of foaming agent on the fresh properties and compressive strength of SCLC. The influence of foaming agent contained in the range from 0 second, 1 second, 2 second, 3 second and 4 second to the strength characteristic identified in the SCLC. The specimens were tested for compressive strength at 3, 7, 14 and 28 days. The result indicated that the compressive strength of SCLC is decreasing when foaming agent content was added. Meanwhile, the flowability of SCLC is increasing when foaming agent content added. Based on the finding, SCLC containing 3 second of foaming agent is achieving the density target, which is 1800kg/m3 and better compressive strength performance.

Synthesis of Compound Foaming Agent of Lightweight Foamed Concrete

2013 ◽  
Vol 785-786 ◽  
pp. 163-166
Author(s):  
Zi Cheng Li ◽  
Ai Ju Zhang ◽  
Zhong Qiu Li ◽  
Hui Qiang Xiang
Keyword(s):  
Synergistic Effects ◽  
Foam Concrete ◽  
Foaming Agent ◽  
Bleeding Volume ◽  
Concrete Blocks ◽  
Foamed Concrete ◽  
Lightweight Foam

The foaming agent used in lightweight gypsum-based foam concrete was discussed. The effect of the single-doped foaming agent, codoped foaming agent and ternary foaming agent on the settling height, bleeding volume and defoaming time of fresh foam were investigated. The results show that ternary foaming agent has potential synergistic effects for reducing settling height and bleeding volume and retarding defoaming time of fresh foam. While applying this new compound foaming agent to the manufacture of the lightweight foam concrete blocks, samples with better-performance were obtained.

scholarly journals Structural Behavior of Precast Lightweight Foam Concrete Sandwich Panel with Double Shear Truss Connectors under Flexural Load

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Noridah Mohamad ◽  
A. I. Khalil ◽  
A. A. Abdul Samad ◽  
W. I. Goh
Keyword(s):  
Compressive Strength ◽  
Sandwich Panel ◽  
Crack Pattern ◽  
Structural Behavior ◽  
Foam Concrete ◽  
Structural Behaviour ◽  
Shear Connectors ◽  
Double Shear ◽  
Partially Composite ◽  
Lightweight Foam

This paper presents the structural behaviour of precast lightweight foam concrete sandwich panel (PFLP) under flexure, studied experimentally and theoretically. Four (4) full scale specimens with a double shear steel connector of 6 mm diameter and steel reinforcement of 9 mm diameter were cast and tested. The panel’s structural behavior was studied in the context of its ultimate flexure load, crack pattern, load-deflection profile, and efficiency of shear connectors. Results showed that the ultimate flexure load obtained from the experiment is influenced by the panel’s compressive strength and thickness. The crack pattern recorded in each panel showed the emergence of initial cracks at the midspan which later spread toward the left and right zones of the slab. The theoretical ultimate load for fully composite and noncomposite panels was obtained from the classical equations. All panel specimens were found to behave in a partially composite manner. Panels PLFP-3 and PLFP-4 with higher compressive strength and total thickness managed to obtain a higher degree of compositeness which is 30 and 32.6 percent, respectively.

The Effect of the Ratio between Water and Foam Concentrate at the Desired Density in the Foam Concrete Mixes

2018 ◽  
Vol 931 ◽  
pp. 573-577
Author(s):  
Vladimir N. Morgun ◽  
Lyubov V. Morgun
Keyword(s):  
Water Content ◽  
Raw Materials ◽  
Foam Concrete ◽  
Foaming Agent ◽  
Stable Foam ◽  
Foam Films ◽  
Concrete Mixtures ◽  
Dispersed Particles

The scientifically grounded and experimentally confirmed features of formation of stable foam concrete mixes in time are considered. It is shown that the formation of such gas-filled structures is possible only with water content, the value of which is sufficient for wetting the surface of all solid dispersed particles of raw materials, the formation of foam films and the processes of adsorption and chemical hydration of binder particles. It is proved that taking into account the value of the aeration potential of the foaming agent, it is possible to obtain stable foam concrete mixtures of a given density

scholarly journals Preparation and Physical Properties of High-Belite Sulphoaluminate Cement-Based Foam Concrete Using an Orthogonal Test

Materials ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 984 ◽  
Author(s):  
Chao Liu ◽  
Jianlin Luo ◽  
Qiuyi Li ◽  
Song Gao ◽  
Zuquan Jin ◽  
...  
Keyword(s):  
Physical Properties ◽  
Economic Cost ◽  
Pore Wall ◽  
Water Repellent ◽  
Dry Density ◽  
Foam Concrete ◽  
Range Analysis ◽  
Foaming Agent ◽  
Sulphoaluminate Cement ◽  
Foam Properties

Prefabricated building development increasingly requires foam concrete (FC) insulation panels with low dry density (ρd), low thermal conductivity coefficient (kc), and a certain compressive strength (fcu). Here, the foam properties of a composite foaming agent with different dilution ratios were studied first, high-belite sulphoaluminate cement (HBSC)-based FCs (HBFCs) with 16 groups of orthogonal mix proportions were subsequently fabricated by a pre-foaming method, and physical properties (ρd, fcu, and kc) of the cured HBFC were characterized in tandem with microstructures. The optimum mix ratios for ρd, fcu, and kc properties were obtained by the range analysis and variance analysis, and the final optimization verification and economic cost of HBFC was also carried out. Orthogonal results show that foam produced by the foaming agent at a dilution ratio of 1:30 can meet the requirements of foam properties for HBFC, with the 1 h bleeding volume, 1 h settling distance, foamability, and foam density being 65.1 ± 3.5 mL, 8.0 ± 0.4 mm, 27.9 ± 0.9 times, and 45.0 ± 1.4 kg/m3, respectively. The increase of fly ash (FA) and foam dosage can effectively reduce the kc of the cured HBFC, but also leads to the decrease of fcu due to the increase in mean pore size and the connected pore amount, and the decline of pore uniformity and pore wall strength. When the dosage of FA, water, foam, and the naphthalene-based superplasticizer of the binder is 20 wt%, 0.50, 16.5 wt%, and 0.6 wt%, the cured HBFC with ρd of 293.5 ± 4.9 kg/m3, fcu of 0.58 ± 0.02 MPa and kc of 0.09234 ± 0.00142 W/m·k is achieved. In addition, the cost of HBFC is only 39.5 $/m3, which is 5.2 $ lower than that of ordinary Portland cement (OPC)-based FC. If the surface of the optimized HBFC is further treated with water repellent, it will completely meet the requirements for a prefabricated ultra-light insulation panel.

Study on Properties of Foam Concrete Based on Fractal Theory

2011 ◽  
Vol 194-196 ◽  
pp. 1916-1919 ◽  
Author(s):  
Wen Ling Tian ◽  
Jiang Bo Yang ◽  
Xiao Yan Zhao
Keyword(s):  
Fractal Dimension ◽  
Fly Ash ◽  
Thermal Insulation ◽  
Fractal Theory ◽  
High Strength ◽  
Sound Insulation ◽  
Foam Concrete ◽  
Insulation Property ◽  
Foaming Agent ◽  
Thermal Insulation Property

Foam concrete is provided with light weight, thermal insulation, sound insulation and fire resistance, good seismic performance and other characteristics. To improve properties of foam concrete microstructure is studied with the help of fractal theory, fractal dimension related to mechanical properties and thermal performance of foam concrete is calculated by MATLAB language program. The results indicate that the microstructure of foam concrete showed significant fractal character, the fractal dimension is between 1.3 and 2.0. Apparent density, 28d compressive strength, and thermal conductivity decreases with the increase of fly ash and foaming agent content, fractal dimension increased. Formulas of fractal dimension and the fly ash, foaming agent content were established. Foam concrete with low density, high strength, and good thermal insulation property will be prepared conducted by the formulas.

Dodecanamide Concrete Foaming Agent: Preparation and Application

2011 ◽  
Vol 71-78 ◽  
pp. 799-802
Author(s):  
Cai Lin Liu ◽  
Yu Rong Zhang ◽  
Hai Jun Yang ◽  
Xian Yan Ren ◽  
Jun Xiao Yang
Keyword(s):  
Chloroacetic Acid ◽  
Foaming Properties ◽  
Dodecanoic Acid ◽  
Temperature Reaction ◽  
Synthetic Route ◽  
Foam Concrete ◽  
Reaction Conditions ◽  
Available N ◽  
Foaming Agent ◽  
Molar Ratios

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.

Influence of Foaming Agent on the Properties of High Density Foam Concrete

2011 ◽  
Vol 399-401 ◽  
pp. 1214-1217 ◽  
Author(s):  
Xin Gang Yu ◽  
Yan Na Gao ◽  
Lin Lin ◽  
Fang Li
Keyword(s):  
Compressive Strength ◽  
Flexural Strength ◽  
Lightweight Concrete ◽  
Drying Shrinkage ◽  
High Strength ◽  
High Density ◽  
Low Density ◽  
Dilution Ratio ◽  
Foam Concrete ◽  
Foaming Agent

Lightweight concrete has been used for structural purposes for many years and it is developed very fast in resent years due to its lightweight and favourable for insulation properties. High strength foam concrete is a fairly new kind of lightweight concrete with excellent properties of outstanding workability, low density and high strength. Responsible for these properties are the macro-, meso- and micro- porosity of the foam concrete which are mainly affected by the foaming agent. The influence of foaming agent’s dilution ratio and foam dosage on the fluidity, compressive strength, flexural strength and drying shrinkage of high density foam concrete designed for structural materials is investigated in this paper.

The Structural Performance of Precast Lightweight Foam Concrete Sandwich Panel with Single and Double Shear Truss Connectors Subjected to Axial Load

2013 ◽  
Vol 634-638 ◽  
pp. 2746-2751 ◽  
Author(s):  
Noridah Mohamad ◽  
Najmuddin Hassan
Keyword(s):  
Construction Industry ◽  
Axial Load ◽  
Sandwich Panel ◽  
Structural Performance ◽  
Foam Concrete ◽  
Shear Connectors ◽  
Double Shear ◽  
Steel Bar ◽  
Strength Capacity ◽  
Lightweight Foam

The progressive research upon the issue on renewal technology that can improve the construction industry has initiated the study of Precast Lightweight Foam Concrete Sandwich Panel (PLFP) as an alternative to Industrialize Building System (IBS). This paper reports the analysis of structural behavior of PLFP with double shear connectors under axial load. The PLFP panel consists of two wythes which enclosed a layer of polystyrene layer. Six (6 mm) rebar was used as the vertical and horizontal reinforcement and 9 mm steel bar bent at 450 was used as the connector. Full scaled panel was tested under axial load till failure. It was found that PLFP panel with double shear truss connector has higher ultimate strength capacity compared to PLFP with single shear connectors ehen tested under axial load.

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