Properties of Precast Concrete Using Food Industry-Filtered Recycled Diatoms

Rodríguez, Carlos; Miñano, Isabel; Parra, C.; Pujante, Pedro; Benito, Francisco J.

doi:10.3390/su13063137

Cited by 4 publications

(2 citation statements)

References 20 publications

(37 reference statements)

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“…The low cost, abundance, easy availability, excellent biocompatibility, non-toxicity, thermal stability, and chemical inertness make diatomite an intriguing material for applications ranging from filtration to pharmaceutics [ 27 , 28 ]. The unique combination of physical and chemical properties of diatomite makes it applicable for several industrial uses, as a filtration media for chemicals, various beverages, drinking water, sugar, etc., without altering their natural properties or for the removal of inorganic and organic pollutants.…”

Section: Introductionmentioning

confidence: 99%

Diatomaceous Earth—Lightweight Pozzolanic Admixtures for Repair Mortars—Complex Chemical and Physical Assessment

et al. 2022

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The presented research is focused on the complex assessment of three different types of diatomaceous earth and evaluation of their ability for application as pozzolana active admixtures applicable in the concrete industry and the production of repair mortars applicable for historical masonry. The comprehensive experimental campaign comprised chemical, mineralogical, microstructural, and physical testing of raw materials, followed by the analyses and characterization of pozzolanic activity, rheology and heat evolution of fresh blended pastes, and testing of macrostructural and mechanical parameters of the hardened 28-days and 90-days samples. The obtained results gave evidence of the different behavior of researched diatomaceous earth when mixed with water and Portland cement. The differences in heat evolution, initial and final setting time, porosity, density, and mechanical parameters were identified based on chemical and phase composition, particle size, specific surface, and morphology of diatomaceous particles. Nevertheless, the researched mineral admixtures yielded a high strength activity index (92.9% to 113.6%), evinced their pozzolanic activity. Three fundamental factors were identified that affect diatomaceous earth’s contribution to the mechanical strength of cement blends. These are the filler effect, the pertinent acceleration of OPC hydration, and the pozzolanic reaction of diatomite with Portland cement hydrates. The optimum replacement level of ordinary Portland cement by diatomaceous earth to give maximum long-term strength enhancement is about 10 wt.%., but it might be further enhanced based on the properties of pozzolan.

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Section: Introductionmentioning

confidence: 99%

Diatomaceous Earth—Lightweight Pozzolanic Admixtures for Repair Mortars—Complex Chemical and Physical Assessment

et al. 2022

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“…Sardemir et al [ 20 ] found that the incorporation of diatomite by mixing calcined diatomite into cement mortar could effectively improve the strength of mortar, and 15% was the optimal dosage. Rodriguez et al [ 21 ] studied the compressive strength and resistance of diatomite-added concrete to chloride ion erosion. After the addition of diatomite, the porosity and pore size decreased, the strength increased by 15%, and the resistance to chloride ion erosion increased by 5% after 90 days.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Mechanical Properties of Diatomite-Modified Coastal Cement Soil

Fang

Wang

et al. 2022

Materials

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Diatomite is a non-metallic mineral resource rich in SiO2, which can be used to modify coastal cement soil. In order to explore the mechanical modification effect of diatomite on coastal cement soil at the age of 7 days, based on coastal cement soil with cement content of 5 % (mass fraction), diatomite of 0 %, 5 %, 10 %, 15 % and 20% (mass fraction) was mixed for modification. Through the unconfined compressive strength test, the triaxial unconsolidated undrained test, backscattered electron imaging (BSE), and energy-dispersive spectroscopy (EDS) technology, the influence of diatomite content and confining pressure on the peak strength of modified coastal cement soil was explored. The empirical formula between the peak strength of the DE specimen and the content of diatomite and confining pressure was established by curve fitting, and the fitting effect was ideal. When diatomite was mixed with coastal cement soil, the optimal dosage of diatomite was 5% from the perspective of mechanical properties and economic benefits of the maximum growth rate of compression and shear. The unconfined compressive strength test showed that the peak strength and elastic modulus of the modified coastal cement soil with 5% diatomite content were 37% and 57% higher than those of cement soil, respectively. The triaxial unconsolidated undrained test showed that the internal friction angle of the modified coastal cement soil was stable at about 30°, and cohesion of DE-5, DE-10, DE-15, and DE-20 increased by 28%, 48%, 78%, and 97%, respectively, compared to cement soil. The microscopic test found that the pore distribution of modified coastal cement soil is closely related to the strength change. The results show that the addition of diatomite can effectively improve the mechanical properties of soil-cement.

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Performance Characterization and Evaluation of Innovative Cement Mortars and Concretes Made with Recycled EPS

Scioti,

Fatiguso

2024

Applied Sciences

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The construction industry involves some of the activities with the highest consumption of raw materials and significant waste production. According to the European Commission, it requires large quantities of resources, representing approximately 50% of all extracted materials, and accounting for over 35% of the EU’s total waste production. In particular, the production and use of concrete, as well as that of EPS (expanded polystyrene), largely exploited for energy-efficient buildings, involve a substantial amount of extracted raw materials and waste. This study focuses on the development of construction materials, such as lightweight and thermally efficient mortars and concretes, incorporating recycled EPS (R-EPS) instead of fine aggregates. Mixtures were designed by partially or completely replacing the fine aggregate with R-EPS on a volume basis. All designed mortars exhibit compressive strength exceeding the minimum values required by Italian legislation and show thermal performance improvements of up to 89.49% compared to the reference mortar. Similarly, the concretes demonstrate strengths compliant with regulations and exhibit thermal characteristic enhancements, ranging from 27.68% for structural lightweight mixes to 74.58% for non-structural ones.

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Properties of Precast Concrete Using Food Industry-Filtered Recycled Diatoms

Cited by 4 publications

References 20 publications

Diatomaceous Earth—Lightweight Pozzolanic Admixtures for Repair Mortars—Complex Chemical and Physical Assessment

Diatomaceous Earth—Lightweight Pozzolanic Admixtures for Repair Mortars—Complex Chemical and Physical Assessment

Experimental Study on the Mechanical Properties of Diatomite-Modified Coastal Cement Soil

Performance Characterization and Evaluation of Innovative Cement Mortars and Concretes Made with Recycled EPS

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