Surprisingly, the issue of durability has been considerably overlooked both in concrete technology research and in building codes. Although an impressive amount of data has been published in the last 30 years concerning the improvement of mechanical properties and mechanical response of concrete and concrete structures or indeed, in the case of self …
In an on-going European project LORCENIS, which focus on the development of durable concrete structures, different types of innovative additives have been tested for use in concrete. As a part of this project the effect of super absorbent polymers (SAP) and polyhedral silsequioxanes (POSS) on different durability issues was investigated in laboratory tests. In …
Durability Enhancement: Additives like silica fume and fly ash improve the durability of concrete by refining the microstructure and reducing permeability. Corrosion Prevention: Corrosion …
Two different additives were compared to see which one is better for improving the durability of concrete. One hundred small batches of concrete were mixed under various conditions and, during the mixing each batch was divided into two parts. One part received additive A and the other part received additive B.
By adding the mentioned concrete additives (water reducer, set retarder or accelerator, binder, etc.) into the concrete matrix, physical and chemical modifications can be made to the concrete ...
Hyeok-Jung et al. investigated the durability of concrete with TDFA ... Recently, water-containing or super-absorbing additives have been added to concrete mix during casting, through which internal curing can be achieved and the process of microcrack formation reduced . Polyethylene glycol, sodium polyacrylate, polypropylene glycol, polyvinyl ...
This vulnerability is a significant factor in the long-term durability of concrete structures [10] and is linked to water evaporation from capillary and gel pores [11]. ... A more effective form of protection involves using an additive to enhance concrete's microstructure. By integrating with the concrete, this additive provides lasting ...
Enhancing Durability with Concrete Additives . Enhancing Workability. Workability is a critical aspect of concrete that affects its ease of handling and placement. Concrete additives like superplasticizers enhance the workability of the mix. Concrete can be more fluid and manageable. Also, this improves construction efficiency.
M. Stehlík. Enhancing the durability of concrete made of concrete recyclate by additives and admixtures 272 measured. The reference quantity is the flow (flow rate)
The durability of concrete has attracted significant attention over the past several decades and is still a research hotspot until now. This paper reviews and discusses recent research activities on the durability of concrete, including: 1) major durability problems such as alkali aggregate reaction, sulfate attack, steel corrosion and freeze–thaw; 2) durability of …
Types of Admixtures and Additives for Concrete. ... The introduction of cold and frost during the curing process can have a devastating effect on the strength and durability of concrete so when trying to work with concrete in cold conditions it's beneficial to get it to cure and reach it's peak strength as quickly as possible to limit any ...
Symbol When You Know Multiply By To Find Symbol Length in inches 25.4 millimeters mm ft feet 0.305 meters m yd yards 0.914 meters m mi miles 1.61 kilometers km Area in2 square inches 2645.2 square millimeters mm ft2 2square feet 0.093 square meters m yd2 2 square yard 0.836 square meters m mi 2 square miles 2.59 square kilometers km
These additives ensure that concrete maintains its strength and structural properties over time, even in harsh environmental conditions, thereby extending the lifespan of concrete structures and reducing the need for costly …
By enhancing the bond between biochar and the concrete matrix, it optimises the utilisation of biochar and its potential contributions to the strength and durability of the concrete. This method plays a significant role in advancing sustainable construction practices and promoting the use of biochar as a valuable additive in concrete mixes.
Highlights Four concrete types were tested, plain, air entrained and fibre at 0.9 kg/m 3 and 1.8 kg/m 3. Freeze/thaw protection is afforded with synthetic fibres Plain concrete provided little freeze/thaw resistance Post freeze/thaw durability factors for concrete with air/(76), 0.9 kg/m 3 /(88), and 1.8 kg/m 3 /(85) Concrete with 0.9 kg/m 3 showed a superior …
An NETL-developed technology improves the strength of cement by up to 30% and enhances durability by 60% using nanostructured carbon additives made from charred coal fine waste. "Cement composites, including cement paste, mortar and concrete, are some of the most widely used construction materials in the world," NETL's Yuan Gao explained.
Concrete additives can reduce the water content required for a specific mix design without compromising its workability or strength. This enhances the overall quality of the concrete and contributes to its long-term …
It can be seen that the combination of MP and GB imparts higher durability to the concrete. The use of MP and GB was found to be most effective in increasing the durability of concrete. This result can be explained by the improved bonding among the additives, cement and aggregate, which resulted in a more condensed matrix.
Concrete additives, including admixtures, reinforcing fibers, and supplementary cementing materials, can improve the strength and durability of concrete by enhancing …
Numerous studies have been conducted to examine the durability of concrete containing various chemical additives and fine metals when exposed to various acid solutions, as well as the preventive ...
The first two compositions (PCO-C and PCO-1) were used to find out how the application of a combined binder change the properties and durability of pervious concrete. Other compositions were used to evaluate the effect of particle size distribution of the coarse aggregate on the properties of pervious concrete with active additives.
The effects of textile properties, such as with/without resin, geometry and additives on the bond between textile and concrete matrix, have been investigated widely, and the bonding mechanism has also been explored. However, the research on the concrete properties, e.g., strength and aggregation, on the bond is limited, and thus is encouraged ...
This document studies the effect of using tamarind kernel powder (TKP) as an additive in concrete on the durability properties of concrete, including water absorption, acid resistance, and chloride resistance. Concrete …
X-ray phase analysis of concrete in different depth after exposure in solution identified gypsum for concrete wi additives only up to10 mm. ... Due to their chemical composition, they contribute to reactions of pozzolana and development of the concrete durability. Acknowledgements The research work was carried out in the frame of ERDF …
Observations have revealed that concrete additives can effectively enhance the freeze–thaw durability of concrete, which due to the following mechanisms: (a) improving internal pore systems using air-entraining agent, supplementary cementitious materials and nanoparticle materials, (b) reducing water absorption of concrete using supplementary ...
The concrete, cementitious materials, aggregates, and air-entraining admixture shall be tested and shall conform to the values of chemical and performance requirements such as initial setting time, compressive strength, shrinkage, …
Graphene-based nanomaterials have been found to improve the mechanical strength and durability of cement-based composites [155]. ... Graphene offers great potential as a concrete additive due to its remarkable features such as efficient heat and electrical conductivity [138], [196]. In this section, we will explore the research and findings ...
In this research, it was studied the dossing effect of nopal mucilage and Ixtle fiber as additives for the enhancement of concrete's mechanical properties: compression strength, flexural strength, heat transfer …
In recent years, substantial research has been carried out on the durability of TRM (also known as Textile Reinforced Concrete-TRC, or Fabric Reinforced Cementitious Matrix composites-FRCM) and ...
Enhancing Durability with Concrete Additives. Adding substances to concrete plays a role, in increasing the longevity of concrete structures making them more resilient against environmental factors and chemical damage.
Hence, sustainability in concrete construction can be successfully achieved by producing durable concrete structures with extended service life [11, 12, 13, 14].
Then, for the initial estimate of the durability performance of geopolymer cement in acidic media, the durability of concrete samples was investigated in 1M sulfuric acid for 7, 28 and 90 days. The results showed that the nano-silica and nano-clay are effective in improving the performance of geopolymer concrete, as the addition of 3% nano ...
