Concrete, the most common material in the building industry, involves the use of mineral aggregates that represent an exhaustible resource, despite their large availability. For a series of applications, these mineral aggregates can be replaced by vegetal ones, which represent an easy renewable natural resource. In this study, two types of vegetal raw materials, namely sunflower stalks and corn cobs, were used in developing 10 compositions of ecological microconcrete, with different percentages involved: 20%, 35%, 50%, 65% and 80%; they were analyzed from the perspectives of density, compressive strength, splitting tensile strength, resistance to repeated freeze-thaw cycles, modulus of elasticity and thermal conductivity. The results revealed that the microconcretes with sunflower stalks registered slightly higher densities and better results regarding the compressive strength, splitting tensile strength, modulus of elasticity, and freeze-thaw resistance than those with corn cobs. Lightweight concrete is obtained when more than 50% replacement rates of the mineral aggregates are used.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8433736 | PMC |
| http://dx.doi.org/10.3390/ma14175078 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
A W/ZSM-5 zeolite was successfully prepared by incorporating tungsten transition metal into a zeolite structure using a conventional impregnation method. The as-obtained W/ZSM-5 zeolite was characterized using several characterization techniques such as XRD, IR and SEM-EDS. The catalyst was then applied to a cascade, single-batch reaction to synthesize bio-polyol from sunflower oils using HO in isopropanol solvent.
View Article and Find Full Text PDFCharacterization of Cellulosic Pulps Isolated from Two Widespread Agricultural Wastes: Cotton and Sunflower Stalks.
Polymers (Basel)
June 2024
Andaltec Plastic Technological Centre, P.I. Cañada de la Fuente, C/Vilches 34, 23600 Martos, Spain.
Globally, huge amounts of cotton and sunflower stalks are generated annually. These wastes are being underutilized since they are mostly burned in the fields. So, in this work, we proposed a three-step method consisting of acid pre-treatment, alkaline hydrolysis, and bleaching for the extraction of cellulose pulps.
View Article and Find Full Text PDFCurrent use of medicinal plants for children's diseases among mothers in Southern Romania.
Front Pharmacol
May 2024
Department of Functional Sciences I/Biochemistry, Faculty of Medicine, Carol Davila University of Medicine and Pharmacy, Bucharest, Romania.
Article Synopsis
- There is a lack of research on ethnomedical practices for children in Eastern Europe, especially in Romania, which has a strong tradition of using medicinal plants for treating childhood illnesses.
- A study involving 326 mothers in Southern Romania identified 25 different plants used for treating various ailments in children, with most knowledge passed down from family and healthcare providers.
- Findings revealed that education level influenced both the number of plants used and the range of illnesses treated, while residency (urban vs. rural) mainly affected how plants were sourced (harvested vs. purchased).
Polysaccharide of sunflower (Helianthus annuus L.) stalk pith inhibits cancer proliferation and metastases via TNF-α pathway.
Int J Biol Macromol
June 2024
Key Laboratory of Forest Plant Ecology, Ministry of Education, Northeast Forestry University, Harbin, PR China; State Engineering Laboratory of Bio-Resources Eco-Utilization, Northeast Forestry University, Harbin, PR China; College of Chemistry Chemical Engineering and Resource Utilization, Northeast Forestry University, Harbin, PR China; Heilongjiang Provincial Key Laboratory of ecological utilization of Forestry-based active substances, Harbin, PR China. Electronic address:
The decoctions of sunflower (Helianthus annuus L. HAL) stalk pith have been used to treat advanced cancer, and polysaccharide of sunflower stalk pith (HSPP) was key ingredient of the decoctions. To forage specially structured HSPP with anti-tumor effects and to uncover its mechanisms of anticancer activity, syngeneic mouse model of lung carcinoma metastasis was established and the HSPP was found to contain long-chain fatty acid.
View Article and Find Full Text PDFAntioxidant and antimicrobial extracts from grape stalks obtained with subcritical water. Potential use in active food packaging development.
Food Chem
September 2024
Institute of Food Engineering FoodUPV, Universtitat Politècnica de València, 46022, Valencia, Spain.
In order to valorise winemaking grape stalks, subcritical water extraction at 160 and 180 °C has been carried out to obtain phenolic-rich extracts useful for developing active food packaging materials. Red (R) and white (W) varieties (from Requena, Spain) were used, and thus, four kinds of extracts were obtained. These were characterised as to their composition, thermal stability and antioxidant and antibacterial activity.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!