Assessing the Effect of Density and Water–Cement Ratio on the Cement Utilisation, Fluidity, Mechanical Properties and Water Absorption of Foam Concrete | Chapter 8 | Engineering Research: Perspectives on Recent Advances Vol. 7

 

Foam Concrete, also known as bubble concrete, is a lightweight building material with a cellular structure and is usually composed of cement mortar and foam. For FC, the determination of density and the water–cement ratio not only indirectly determines the content of its components, but it also plays an important role in influencing the workability and mechanical properties of FC. This study analyse the influence of density and the water–cement (W/C) ratio on the slurry fluidity, compressive strength, and water absorption of foamed concrete (FC) and its mechanism of action, with the aim of proposing an optimal mix ratio for FC to reduce cement usage and carbon emissions in the construction industry and ensure the good overall performance of FC. In this experiment, two groups of experiments were designed using the control variable method. The compressive strength of the FC block was tested using a uniaxial compression test, and the UPV and rebound value of the FC block were tested through nondestructive testing. The water absorption rate of the FC test block was tested. Fluidity and uniaxial compression tests showed that when the density was 600 kg/m3 and the W/C ratio was 0.6, the FC slurry had maximum fluidity, but its mechanical properties were poor, and it collapsed easily. Conversely, by analysing the uniaxial compressive strength/cement (UCS/C) ratio, it was observed that the mix ratio had a maximum cement utilisation rate (W/C ratio) of 0.5 and a density of 1000 kg/m3. The final analysis showed that the optimal mix ratio of FC in this test was W/C = 0.5, with a density of 1000 kg/m3. The results of this experiment can be used as a reference for basic experimental research in the field of foamed concrete. Further experiments are needed to investigate the effects of density and W/C ratio on other types of concrete, as well as to determine whether the working performance of foam concrete will change in actual construction environments.

 

Author(s) Details

Alipujiang Jierula
College of Architecture and Engineering, Xinjiang University, Urumqi 830046, China and Xinjiang Key Laboratory of Building Structure and Earthquake Resistance, Xinjiang University, Urumqi 830046, China.

 

Haodong Li
College of Architecture and Engineering, Xinjiang University, Urumqi 830046, China.

 

Yang Chen
College of Architecture and Engineering, Xinjiang University, Urumqi 830046, China.

 

Cong Wu
College of Architecture and Engineering, Xinjiang University, Urumqi 830046, China and Xinjiang Key Laboratory of Building Structure and Earthquake Resistance, Xinjiang University, Urumqi 830046, China.

 

Xiao Wu
College of Architecture and Engineering, Xinjiang University, Urumqi 830046, China.

 

Hanlin Yin
College of Architecture and Engineering, Xinjiang University, Urumqi 830046, China.

 

Please see the book here:- https://doi.org/10.9734/bpi/erpra/v7/5591

Mechanical Properties of Compressed Stabilised Earth Blocks with Rice Husk Ash| New Visions in Science and Technology Vol. 5

The purpose of this study was to see if Rice Husk Ash (RHA) could be used as a partial replacement for cement in clay soil incompressed earth blocks. The percentage of rice husk ash ranged from 0 to 2.5 percent, 5 percent, 7.5 percent, 10 percent, and 12.5 percent. The blocks admixed with 10% rice husk ash had the highest compressive strength of 1.90 MPa. Water absorption increased continuously as the proportion of rice husk ash increased, with a value of 8.55 percent for the block with 12.5 percent RHA. As the percentage of rice husk ash in the blocks increased, the unit weight of the blocks fell.

Author (S) Details

P. Asha

Department of Civil Engineering, Jerusalem College of Engineering, Pallikaranai, Chennai – 600100, India.

View Book :- https://stm.bookpi.org/NVST-V5/article/view/4121

Assessing the Atmospheric Pressure Plasma Treatment for Grey Cotton Knitted Fabric | Chapter 3 | Current Perspectives on Chemical Sciences Vol. 4

Enerally speaking, when cotton fabrics are in gray form, they contain natural and added impurities, such as natural oil, waxes, pectin and coloring matter, etc., i.e. impurities, such as stains of machine oil and dust, from the fiber itself, from the processing process, as well as from the environment. The impurities and yellowness of 100 percent grey cotton knitted fabric must be prepared for processing to make it ready for coloring and finishing. Therefore, 100% grey cotton knitted fabric is conventionally subjected to a scouring and bleaching procedure requiring the use of vast quantities of water and chemicals to eliminate impurities and yellowness. The pursuit of a reduction in water and chemicals is a new trend in textile production because of increased environmental awareness. In this research, we are exploring the possibility of using plasma atmospheric pressure as a dry method before processing to treat 100 percent grey cotton knitted fabric (single jersey and interlock). Experimental findings show that plasma treatment with atmospheric pressure can effectively remove impurities from 100 percent gray cotton knitted fabrics and dramatically increase the property of water absorption. On the other hand, the treatment period is decreased if 100 percent grey cotton knitted fabrics are pretreated with plasma and then subjected to a regular scouring procedure. In addition, surface morphological and chemical changes in plasma-treated fabrics have been studied and contrasted with traditional scanning electron microscope (SEM) fabrics, Fourier-transform infrared spectroscopy-attenuated total reflection (FTIR-ATR) and X-ray photoelectron spectroscopy (X-ray) fabrics (XPS). As seen in the XPS, the decrease in carbon content reveals the elimination of surface impurities. The plasma-treated knitted fabrics' oxygen-to-carbon (O/C) ratios show enhanced hydrophilicity. Furthermore, after plasma therapy, the yellowness of plasma-treated grey cotton knitted fabrics did not further increase.

Author (s) Details

Chi-Wai Kan
Institute of Textiles and Clothing, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China.

Chui-fung Lam
Institute of Textiles and Clothing, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China.

View Book :- https://bp.bookpi.org/index.php/bpi/catalog/book/352