Thank you for downloading properties of concrete. As you may know, people have look hundreds times for their chosen readings like this properties of concrete, but end up in malicious downloads. Rather than reading a good book with a cup of coffee in the afternoon, instead they juggled with some malicious virus inside their computer. properties of concrete is available in our digital library an online access to it is set as public so you can download it instantly. Our digital library hosts in multiple locations, allowing you to get the most less latency time to download any of our books like this one. Merely said, the properties of concrete is universally compatible with any devices to read.

Properties Of Concrete

http://jultika.oulu.fi/files/nbnfi-fe2017112150815.pdf

One-part alkali-activated materials : a review

Disposal of waste tire rubber has become a major environmental issue in all parts of the world. Every year millions of tires are discarded, thrown away or buried all over the world, representing a very serious threat to the ecology. It was estimated that almost 1000 million tires end their service life every year and out of that, more than 50% are discarded to landfills or garbage without any treatment. By the year 2030, there would be 5000 million tires to be discarded on a regular basis. Tire burning, which was the easiest and cheapest method of disposal, causes serious fire hazards. Temperature in that area rises and the poisonous smoke with uncontrolled emissions of potentially harmful compounds is very dangerous to humans, animals and plants. The residue powder left after burning pollutes the soil. One of the possible solutions for the use of waste tire rubber is to incorporate into cement concrete. This paper presents an overview of some of the research published regarding the fresh and hardened properties of rubberized concrete. Studies show that there is a promising future for the use of waste tire rubber as a partial substitute for aggregate in cement concrete. It was noticed from literatures that workable concrete mixtures can be made with scrap tire rubber and it is possible to make light weight rubber aggregate concrete for some special purposes. Rubberized concrete shows high resistance to freeze-thaw, acid attack and chloride ion penetration. Use of silica fume in rubberized concrete enables to achieve high strength and high resistance to sulfate, acid and chloride environments.

A comprehensive review on the applications of waste tire rubber in cement concrete

Recycling of waste tire rubber as aggregate in concrete: durability-related performance

Hardened properties of concrete mixtures containing pre-coated crumb rubber and silica fume

The recycling of reclaimed asphalt pavement (RAP) helps road authorities to achieve their goal of a sustainable road transport system by reducing waste production and resources consumption. The environmental and economic benefits of using RAP in hot mix asphalt (HMA) applications could be pushed up to the limit, by producing totally recycled HMAs (100% RAP), but the performance of this alternative must be satisfactory. In fact, these mixtures could possibly present problems of workability and durability, higher binder aging and low fatigue cracking resistance. Thus, the objective of this study is to determine if totally recycled HMA mixtures could be a good solution for road paving, by evaluating the merit of some rejuvenator agents (commercial product; used engine oil) in improving the aged binders’ properties and the recycled mixture performance. Several binder samples were prepared with the mentioned rejuvenators and characterized (Pen, R&B and dynamic viscosity), in order to select the best rejuvenator contents. The production temperatures of the corresponding recycled mixtures were evaluated based on their workability. Totally recycled HMAs were produced with the best previously observed combinations, and their performance (water sensitivity, rutting resistance, stiffness, fatigue resistance, binder aging) was assessed. The main conclusion of this study is that totally recycled HMAs can be a good alternative for road paving, especially if rejuvenator agents are used to reduce their production temperature and to improve their performance.

Are totally recycled hot mix asphalts a sustainable alternative for road paving

https://repositorium.sdum.uminho.pt/bitstream/1822/18533/1/Paper%20HPC.pdf

Properties and durability of HPC with tyre rubber wastes

Environmental concerns regarding the high CO2 emissions related to the production of ordinary Portland cement (OPC) led to research efforts on the development of eco-efficient alternative binders. Geopolymers constitute promising inorganic binders alternative to OPC which are based on aluminosilicates by-products and alkali activators. The geopolymerization technology of aluminosilicates is a complex chemical process evolving dissolution of raw materials, transportation, orientation and polycondensation of the reaction products. Classical two part geopolymers could become more eco-efficient with a lower CO2 footprint if sodium silicate usage is avoided. Besides current geopolymeric mixes can suffer from efflorescence originated by the fact that alkaline or soluble silicates that are added during processing cannot be totally consumed during geopolymerisation. Therefore, new and improved geopolymer mixes are needed. One-part geopolymers (sodium silicate free) were first proposed in 2007. However, very few papers were published on these materials. This paper presents experimental results on the durability performance of one-part geopolymers concerning water absorption, penetration of chloride, carbonation resistance and resistance to acid attack. Hydration products results assessed by FTIR spectra are also presented.

/pdf/durability-performance-of-fly-ash-based-one-part-geopolymer-46whwpoooh.pdf

Durability performance of fly ash based one-part geopolymer mortars

The goal of this investigation was evaluate the potential of an alkali-activated binary mortar (AABM), based on a natural volcanic pozzolan (70%) and granulated blast furnace slag (30%), as a repair material. This evaluation focused on its physico-mechanical characterisation (compressive, flexural and splitting tensile strengths; modulus of elasticity; capillary water absorption; and shrinkage) and the measurement of its adherence to three class of OPC concretes (substrates) using pull-off tests. A mixture of NaOH and Na2SiO3 was used as alkaline activator. The compressive and splitting tensile strength of AABM were 34.8 MPa and 2.13 MPa at 28 days of curing, respectively. Its capillary absorption coefficient and modulus of elasticity were 0.5088 kg/m2h0.5 and 8.66 GPa respectively. The results of the pull-off test demonstrate the adherent nature of the AABM, which was promoted by the strength (quality) of the OPC substrate, with pull-off adherences of 0.75 MPa, 1.14 MPa and 1.24 MPa for class C25/30, C35/45 and C50/60, respectively. According to the results obtained and standard specifications (EN 1504-3), this material can be classified as a class R2-repair mortar.

https://repositorium.sdum.uminho.pt/bitstream/1822/60386/1/2999-Salazar__2019.pdf

Alkali-activated binary mortar based on natural volcanic pozzolan for repair applications

The environmental and economic benefits of using Reclaimed Asphalt Pavement (RAP) material in hot mix asphalt (HMA) applications could be pushed up to the limit, by producing totally recycled HMAs (100% RAP), but the performance of this alternative must be satisfactory. In the present study, the utilization of a used motor oil as a rejuvenator was evaluated. This would allow the aged binder to restore some of its original properties, thus promoting an adequate performance of the mixture. After studying the RAP moisture content, the optimal amount of oil was determined by conventional bitumen tests, using the penetration grade as the selection criterion. Then, the binder was evaluated through rheological testing, and laboratory specimens were prepared and tested for water sensitivity, permanent deformation, stiffness and fatigue, in order to confirm that the totally recycled mixture will perform as good as a conventional mixture used for comparison purposes.

Carlos M. G. Jesus

Papers

Are totally recycled hot mix asphalts a sustainable alternative for road paving

Properties and durability of HPC with tyre rubber wastes

Durability performance of fly ash based one-part geopolymer mortars

Alkali-activated binary mortar based on natural volcanic pozzolan for repair applications

Pushing the Asphalt Recycling Technology to the Limit