scholarly journals Efficiency of Sodium Polyacrylate to Improve Durability of Concrete under Adverse Curing Condition

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Tanvir Manzur ◽  
Shohana Iffat ◽  
Munaz Ahmed Noor
Keyword(s):  
Internal Curing ◽  
Curing Agent ◽  
Sodium Polyacrylate ◽  
Curing Process ◽  
Super Absorbent Polymer ◽  
Curing Conditions ◽  
Naturally Occurring ◽  
Additional Water ◽  
Strength And Durability ◽  
Absorbent Polymer

The conventional external curing process requires supply of large amount of water in addition to mixing water as well as strict quality control protocol. However, in a developing country like Bangladesh, many local contractors do not have awareness and required knowledge on importance of curing which often results in weaker concrete with durability issues. Moreover, at times it is difficult to maintain proper external curing process due to nonavailability of water and skilled laborer. Internal curing can be adopted under such scenario since this method is simple and less quality intensive. Usually, naturally occurring porous light weight aggregates (LWA) are used as internal curing agent. However, naturally occurring LWA are not available in many countries like Bangladesh. Under these circumstances, Super Absorbent Polymer (SAP) can be utilized as an alternative internal curing agent. In this study, sodium polyacrylate (SP) as SAP has been used to produce internally cured concrete. Desorption isotherm of SP has been developed to investigate its effectiveness as internal curing agent. Test results showed that internally cured concrete with SP performed better in terms of both strength and durability as compared to control samples when subjected to adverse curing conditions where supply of additional water for external curing was absent.

scholarly journals Performance of super-absorbent polymer as an internal curing agent for self-compacting concrete

2018 ◽  
Vol 162 ◽  
pp. 02023 ◽  
Author(s):  
Suhair Al-Hubboubi ◽  
Tareq al-Attar ◽  
Haider Al-Badry ◽  
Samir Abood ◽  
Rawaa Mohammed ◽  
...  
Keyword(s):  
Fresh Concrete ◽  
Internal Curing ◽  
Curing Agent ◽  
Self Compacting Concrete ◽  
Super Absorbent Polymer ◽  
Strength Tests ◽  
Fresh State ◽  
Concrete Mix ◽  
Water Curing ◽  
Absorbent Polymer

Internal curing agent by using super-absorbent polymer was present in this study, its effect on the properties of self-compacting concrete was evaluated .The SAP content in the concrete mix was 0.5 % by weight of cement. Three procedures for curing were adopted; curing in water, curing in water and air and curing in polyethylene sealed bags. Fresh concrete tests conducted to assess the self-compactability of the produced concrete. Moreover, compressive and splitting strength tests were carried out. The testing program had been extended to the age of 90 days.The use of super-absorbent polymer did not affect the fresh state characteristics of the studied SCC and achieved an increase in both compressive and tensile strengths as compared to the reference concrete mix.

Improving hydraulic performance and durability of sandwich clay liner using super-absorbent polymer

2017 ◽  
Vol 21 (3) ◽  
pp. 1055-1071 ◽  
Author(s):  
Niloofar Salemi ◽  
Seyed Mehdi Abtahi ◽  
Mohammad Ali Rowshanzamir ◽  
Seyed Mehdi Hejazi
Keyword(s):  
Hydraulic Conductivity ◽  
Hydraulic Performance ◽  
Partial Replacement ◽  
Sodium Polyacrylate ◽  
Self Healing ◽  
Super Absorbent Polymer ◽  
Geosynthetic Clay Liner ◽  
Clay Liner ◽  
Swell Index ◽  
Absorbent Polymer

The hydraulic performance and durability of geosynthetic clay liner containing various amounts of sodium polyacrylate polymer are experimentally studied. Sodium polyacrylate, generally known as a super-absorbent polymer, is a polymeric material with a potential of high water absorbance due to its chemical structure. In this study, sodium polyacrylate powder is used as a partial replacement of bentonite as much as 3%, 5% and 7% by the weight of bentonite. For comparison, the hydraulic performance of geosynthetic clay liner without super-absorbent polymer is also experimented. Atterberg limits, free swell index, hydraulic conductivity, self-healing capacity and wet/dry cycle tests are conducted in order to assess how super-absorbent polymer can affect the performance of geosynthetic clay liners as landfill liners and covers. The results show that the hydraulic conductivity and self-healing capacity of geosynthetic clay liner are relatively enhanced by super-absorbent polymer inclusion. The results of wet/dry cycle test show that using super-absorbent polymer as a partial replacement of bentonite considerably improves the durability of geosynthetic clay liner against wet/dry cycles. Geosynthetic clay liner containing super-absorbent polymer shows a negligible increase in hydraulic conductivity while there is a noticeable increase in hydraulic conductivity of specimen without super-absorbent polymer after 10 cycles of wetting and drying.

scholarly journals A Method for Internal Curing Water Calculation of Concrete with Super Absorbent Polymer

2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Shouqi Zhang ◽  
Zhenbao Lu ◽  
Yongxin Li ◽  
Yuan Ang ◽  
Kechao Zhang
Keyword(s):  
Phase Distribution ◽  
Autogenous Shrinkage ◽  
Mineral Admixture ◽  
Internal Curing ◽  
Hardened Concrete ◽  
Hardened Cement ◽  
Cement Pastes ◽  
Super Absorbent Polymer ◽  
Degree Of Hydration ◽  
Absorbent Polymer

The internal curing method is effective in reducing the self-desiccation of concrete, and the amount of internal curing water (IC water) is greatly important to the shrinkage and strength of concrete. A method for calculating IC water of concrete with and without mineral admixture has been developed. The method is derived from Powers’ model for the phase distribution of a hydrating cement paste. To verify the method, a series of autogenous shrinkage and compressive strength of concrete with and without super absorbent polymer (SAP) were evaluated compared with the method proposed previously. To explain the macro performance of hardened concrete, the nonevaporable water content and calcium hydroxide content measurement were utilized to evaluate the degree of hydration of cement pastes. And, mercury intrusion method and image analysis method were used to explore the pore structure in hardened cement pastes and air void characteristics in hardened concrete, respectively. Furthermore, the evolution process was also studied for the relative humidity inside the concrete.

Effect of Curing Methods on Strength and Durability Properties of M30 Grade Concrete

2021 ◽  
Vol 9 (11) ◽  
pp. 1386-1389
Author(s):  
Chidananda G
Keyword(s):  
Compressive Strength ◽  
Fresh Concrete ◽  
Hardened Concrete ◽  
Concrete Compressive Strength ◽  
Super Absorbent Polymer ◽  
Carbonation Resistance ◽  
Curing Methods ◽  
Water Curing ◽  
Strength And Durability ◽  
Absorbent Polymer

Abstract: This paper presents an experimental investigation on influence of different curing methods on the performance of M30 grade concrete. Different curing methods such as air curing, pond curing, intermittent curing, gunny bags curing, chemical curing and using Super Absorbent Polymer (SAP) by 0.3% of weight of cement are considered. Slump and compacting factor tests are performed to know the workability of fresh concrete. Compressive strength of hardened concrete is determined for concrete specimens cured by different curing methods. Durability in terms of carbonation resistance on hardened concrete is also performed as per IS 516 (Part 5/Sec 3, 2021) codal provisions. Depending upon the site conditions and availability of potable water, curing methods such as pond curing, intermittent curing, gunny bags curing, chemical curing and SAP curing can be adopted in site to achieve the expected strength and durability requirements. Keywords: Curing methods, Compressive strength and Carbonation resistance.

Effects of Internal Curing by Super Absorbent Polymer on Shrinkage of Concrete

2011 ◽  
Vol 477 ◽  
pp. 200-204 ◽  
Author(s):  
Lu Feng Pang ◽  
Shi Ye Ruan ◽  
Yong Tao Cai
Keyword(s):  
Cement Mortar ◽  
Internal Curing ◽  
Blank Group ◽  
Super Absorbent Polymer ◽  
Absorbent Polymer

This paper focuses on the shrinkage of concrete, influenced by the different mixing amount of super absorbent polymer—SAP and extra-water. The experiment showed that the SAP-cement-mortar shrinkage is reduced greatly by mixing SAP. Extra-water can improve the function of reducing shrinkage of SAP. When the amount is 20, the shrinkage is lest, account for 57% of blank group’s. The SAP has well effect on the cement mortar shrinkage. Besides, we found that the strength of this group account for 89% of blank group. So the proper amount of SAP and extra-water has poorly influence on the strength of concrete.

Curing Process of Epoxy Resin Using Low Molecular Polyamide 651 as Curing Agent

2014 ◽  
Vol 936 ◽  
pp. 63-66 ◽  
Author(s):  
Chun Hua Han ◽  
Lin Wang ◽  
Dong Yu Zhao
Keyword(s):  
Epoxy Resin ◽  
Room Temperature ◽  
Curing Agent ◽  
Curing Process ◽  
Curing Conditions ◽  
Temperature Spectra ◽  
Infrared Spectral ◽  
Ft Ir ◽  
Ir Analysis ◽  
Epoxy Groups

In this paper low molecular polyamide 651(PA651) is used as the curing agent of epoxy resin. The optimum curing conditions and dosage of the curing agent are obtained by DMA and FT-IR analysis. Based on the dynamic mechanical temperature spectra of samples test, the best curing conditions are room temperature 2 hours, 70°C 2 hours, 125°C 2.5 hours and 150°C 1 hours (RT / 2 h + 70 °C / 2 h +125°C / 2.5 h + 150 °C / 1 h). The best dosage of curing agent PA651 is 50 wt %. Since the analysis of Fourier Infrared spectral verified that epoxy groups react completely, the curing conditions are the best curing process.

Study on Adding Super Absorbent Polymer to Improve the Frost Resistance of Concrete

2014 ◽  
Vol 584-586 ◽  
pp. 960-963 ◽  
Author(s):  
De Zhi Wang ◽  
Yin Yan Zhang ◽  
Yun Fang Meng
Keyword(s):  
Fly Ash ◽  
Pore Structure ◽  
Frost Resistance ◽  
Strength Loss ◽  
Internal Curing ◽  
Super Absorbent Polymer ◽  
Freeze Thaw ◽  
Absorbent Polymer

Internal curing was especially beneficial to improve concrete performance. The super absorbent polymer and fly ash were used in the concrete and the frost resistance of concrete was studied. The result indicated that the super absorbent polymer changed the pore structure, increased the quantity of the pore, decreased the strength loss 5-10% after 250 freeze-thaw cycles and improved the frost resistance of concrete.

Feasibility of Bentonite as an Internal Curing Agent in Concrete

2020 ◽  
Vol 13 ◽  
Author(s):  
Abhishek Singh ◽  
Ch. L. Phaneendra ◽  
G. S. Saiveer ◽  
Saurabh Chandravanshi ◽  
Udit Sharma ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Flexural Strength ◽  
Economic Feasibility ◽  
Internal Curing ◽  
Curing Agent ◽  
Field Methods ◽  
Curing Conditions ◽  
Quality Of Water ◽  
Point Test

Abstract:: Background: There is a requirement of internal curing especially in areas where water is scarce and where it is difficult to cure concrete due to inaccessibility of site. About five times higher water is consumed in curing than water mixed in making concrete. Furthermore the quality of water that is to be used for these activities is required to be within certain standards. If the requirement of water can be reduced, it becomes both economically and ecologically viable. Objective: Present research is carried out to determine technical and economic feasibility of bentonite as internal curing agent on properties of concrete in the field. Methods: This paper compares the compressive and flexural strength parameters for standard and bentonite infused concrete and whether this can be considered as a suitable addition in concrete. The flexural strength is measured using four point test. Both tests are carried out in accordance with IS codes. Results: There is an increase in compressive strength for both intermittent and air curing of internally cured concrete in comparison to control concrete. Furthermore air curing of internally cured concrete is comparable to intermittent curing of control concrete. Also compressive strength of intermittent curing concrete with bentonite is comparable with the strength obtained by pond curing of control concrete. Conclusions: The results indicate that bentonite can be considered as a viable addition to concrete, especially in cases of air curing. The use of bentonite is thus recommended more so for air curing and intermittent curing conditions.

scholarly journals Use of normal-density high-absorption limestone aggregate as internal curing agent in concrete

2015 ◽  
Vol 42 (11) ◽  
pp. 827-833 ◽  
Author(s):  
Rómel Solís-Carcaño ◽  
Laura V. Terán-Marín ◽  
Eric I. Moreno
Keyword(s):  
Compressive Strength ◽  
Internal Curing ◽  
Hydration Process ◽  
Normal Density ◽  
Curing Agent ◽  
Limestone Aggregate ◽  
Rock Aggregate ◽  
Additional Water ◽  
Natural Aggregates ◽  
High Absorption

A common practice to provide additional water for the hydration process of cement is to use special aggregates that act as agents incorporating water to the concrete (lightweight natural aggregates or polymers). Previous studies have suggested that normal-density high-absorption limestone aggregates may produce a similar effect. The aim was to determine if they can function as an internal curing agent. The methodology consisted of concrete specimens employing two types of aggregates and subjected to three different curing treatments. Results showed similar values of compressive strength and porosity among the concrete cured under wet and dry treatments for the high-absorption limestone aggregate but not for the river rock aggregate. Thus, this effect was attributed to the internal curing properties of the high-absorption limestone aggregate.

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