Drying shrinkage

Part 1 of ebook "Creep and hygrothermal effects in concrete structures" provides readers with contents including: Chapter 1 – Introduction how the theory evolved and how it impacts practice; Chapter 2 - Fundamentals of linear viscoelasticity; Chapter 3 - Basic properties of concrete creep, shrinkage, and drying; Chapter 4 - Structural effects of creep and age-adjusted effective modulus method; Chapter 5 - Numerical analysis of creep problems; Chapter 6 - Uncertainty due to parameter randomness via sampling of deterministic solutions;...

451p mothoiphong 28-06-2024 1 1   Download

The recycled steel fibers from waste steel cables have properties suitable for enhancing the load-bearing capacity, impact resistance, and shrinkage reduction of Self-Compacting Concrete (SCC). This article presents the experimental research results on the influence of the content of recycled steel fibers on the properties of high-fly-ash SCC.

13p viohoyo 25-04-2024 4 2   Download

In this study, fly ash and ground granulated blastfurnace slag (GGBFS), by-products from the industry, are used as binder materials to manufacture high-performance mortars that will be used to repair marine concrete structures.

5p viplato 02-01-2024 5 3   Download

Geopolymer has emerged as the potential alternative to Portland cement in recent years. In addition, fly ash and recycled glass are abundant by-products derived from the industry. The purpose of this study was to evaluate the potential of using recycled glass to replace the sand aggregate in slagblended fly ash-based geopolymer mortar.

7p viisac 15-09-2023 4 2   Download

In this study, the sol-gel method was used for the synthesis of hydrogels based on liquid glass and sodium lignosulfonate. Isopropyl alcohol was used to subsitute water in the hydrogel structure, preventing linear shrinkage and maintaining the water content in the range of 1-4.8%.

11p viengels 25-08-2023 3 3   Download

Investigation into the reuse of industrial by-products for producing eco-friendly construction materials has still received much attention from research scholars around the world. This study investigates the influence of fly ash (FA) content as a cement replacement on the fresh and hardened properties of cement paste.

5p vifred 23-12-2022 11 3   Download

This study aims to develop an HPFRM with low polypropylene fiber content by using locally available ingredients in Southern Vietnam to address the deficiencies commonly observed in traditional cement grout mortars. Three mixture proportions were prepared with different water-to-binder (w/b) ratios of 0.2, 0.25, and 0.3. Then, the performance of HPFRM was evaluated in both fresh and hardened stages.

17p viaudi 29-08-2022 6 2   Download

The test results show that SRA reduces the flexural and compressive strengths of mortar. The reduction in flexural strength and compressive strength at 28 days is 14% and 25%, respectively at 7% SRA dosage. In addition, SRA significantly reduces the drying shrinkage and water absorption of mortar.

9p inception36 30-11-2021 16 2   Download

The reduction in flexural strength and compressive strength at 28 days is 14% and 25%, respectively at 7% SRA dosage. In addition, SRA significantly reduces the drying shrinkage and water absorption of mortar. At 7% SRA dosage, the drying shrinkage at 53 days is reduced by 60% while the water absorption rate at 24 hours is reduced by 54%. However, SRA has a minor effect on the pore size distribution, effective porosity, and cumulative intrusion volume of mortar.

13p inception36 30-11-2021 14 1   Download

This paper presents the results of an experimental investigation of the effect of wetting-drying cycles on the surface cracking and swell-shrink behavior of modified expansive soils. An image processing technique was employed to understand this effect by quantifying the surface crack area density, crack number, crack length, mean crack width, and absolute shrinkage.

13p cothumenhmong9 12-01-2021 8 2   Download

In this research, the performance of a cementless eco-binder, a mixture of waste materials including slag, circulating fluidized bed combustion ash (CFA), and rice husk ash (RHA) was investigated, in which CFA acted as an activator. One hundred and twenty paste samples were prepared by using the RHA/(slag + RHA) ratios of 0, 15, 30, 45% while keeping a constant ratio of CFA/(slag + RHA) at 25%. The setting period, compressive strength, the ultrasonic pulse velocity (UPV), and drying shrinkage of paste samples were determined at the samples’ age of up to 91 days.

13p cothumenhmong8 04-11-2020 11 1   Download

This study presents a series of soil concrete mix that is made of excavated soils, cement, lime and hemp fibers. An experimental program was carried out on the testing samples of soil concrete with different proportions of clayey soil and hemp fibers.

12p cothumenhmong8 04-11-2020 16 2   Download

Sweet potato (Ipomoea batatas L.) is the sixth most important crop grown worldwide after wheat, rice, maize, potato and cassava and is considered as staple food in many developing countries. The largest quantity of sweet potato production is noticed in Asia and the Pacific Islands (93% of global production). However, sweet potatoes face the problem of weevils, shrinkage and loss of nutrients in storage. Therefore, present research on shelf-life and physicochemical parameters of 12 different sweet potato genotypes were studied in order to determine the varieties for better storage.

7p chauchaungayxua3 07-02-2020 22 0   Download

Shrinkage strain data from tests of blocks from twenty-four block plants in Ontario shows that the majority of shrinkage occurs during later stages of drying. From a fully saturated state, it is generally necessary to remove much more than half of the water before significant shrinkage begins. From this data, it appears that water content as an absolute rather than a relative value may be a better indicator of the benefits of predrying as a measure to preshrink the block and limit the potential for shrinkage in situ.

11p christian2605 30-10-2019 26 2   Download

In this paper, methods of testing the drying shrinkage of concrete blocks are evaluated. Tests were done on blocks of differing strengths, suppliers and curing procedures. The shrinkage tests were carried out as recommended in ASTM C426 [1], using the whole block as specimens and with gauge discs attached to the sides. Three variations of this set-up were also tested: a face-shell prism cut from a whole block with gauge plugs attached to the sides, the same specimen with gauge discs attached to the top and bottom and whole blocks with gauge discs attached to the top and bottom.

10p christian2605 30-10-2019 17 2   Download

Deterioration mechanism due to drying and shrinkage of patch-repaired regions in reinforced concrete structures is analytically investigated. The moisture diffusion coefficient of the repair materials was determined by varying the drying temperature and the polymer-tocement ratios of the polymer-modified cement mortar (PCM) in the experiment. It is found that the diffusivity of PCM increases in proportion to the polymer-to-cement ratio up to 10%.

14p christian2605 11-10-2019 13 0   Download

The decrease in strength of tile adhesive mortars during wet storage was investigated. In a first approach, the water resistance of the polymer phases was tested on structures isolated from the mortar and in situ. It was observed that cellulose ether and polyvinyl alcohol structures are water-soluble. Subsequent investigations on polymer mobility within the mortar showed that the migrating pore water transports cellulose ether and polyvinyl alcohol during periods of water intrusion and drying. This leads to enrichments at the mortar – substrate interface.

12p christian2605 11-10-2019 20 0   Download

Recently, polymer-modified mortar has been studied for proposed use on industrial floors as top coat with thin thickness, typically 5 – 15 mm. The purpose of this study is to evaluate basic properties of self-leveling materials using polymer dispersions as kinds of SBR latex, PAE and St/BA emulsions for thin coatings (under 3 mm in thickness). Superplasticizer and thickener have been included in the mixes to reduce bleeding and drying shrinkage as well as to facilitate the workability required.

9p christian2605 11-10-2019 11 0   Download

This paper briefly overviews experimental procedure and methods of self-healing studies; and the damage of concrete materials due to drying shrinkage. Microstructure observations such as SEM, ESEM are used as popular methods in self-healing researches; however, they are difficult to be carried out in case of 3D-cracks.To solve the problem, this study proposes a sampling method that makes easier to be observe the microstructure of products on surfaces of simulated cracks.

7p vinobita2711 31-05-2019 11 0   Download

This paper presents the experimental results of researching on plastic shrinkage (plastic deformation) and the effect of curing methods on the process of plastic shrinkage at the early stages when self-compacting concrete (SCC) starts setting and develops the strength. The experiments were carried out in two typical climatic conditions in Vietnam which are humid and dry.

12p vinobita2711 31-05-2019 3 0   Download