Development of Sucrose and Citric Acid as the Natural based …
The available commercial admixture cannot provide significant improvement to the rapid setting time generated by high calcium in geopolymer system. This research …
The Role of Chemical Admixtures in the Formulation of …
Abstract. Chemical admixtures constitute indispensable ingredients for the production of modern advanced concrete. In developed countries, at least 80% of the concrete produced contains one or several admixtures. They include plasticizers, superplasticizers, retarders, accelerators, stabilizers, deers, ers and shrinkage …
yeegroglobal
Welcome To yeegroglobal. Yeegro Global Co.,Ltd is a professional construction chemical company. Our main products is Polycarboxylate Superplasticizer (PCE), Poly Naphthalene Sulfonate (PNS).our water reducer bussiness is start from 2003. We are working hard to develop a seamless connection with our customers, and placing a strong emphasis on ...
Effects of Borax, Sucrose, and Citric Acid on the Setting Time …
In addition, when citric acid was used as a retarder for FA-AAM, some researchers found that citric acid did not act as a retarder but as an accelerator of the setting at 1.5% and 2.5% admixture . The results of these studies indicate that it is not feasible to use traditional cement retarders directly to AAS.
(PDF) Accelerating admixtures for concrete
Accelerating admixtures affect th e rates of reactions between cement and water to give an overall. increase in the hydration rate. Thus, the use of accelerators in concrete provides a shortening ...
Citric Acid
Citric acid is used as a flavouring in many preparations of Vitamin C, and has a wide variety of other uses. In industry, citric acid can be used to make good "natural" cleaners, though some may still contain chemicals that are not exactly natural. ... Concrete & Cement (25) Admixtures (22) Plasticizers (1) Retarders (1) Waterproofing ...
Influence of Citric Acid on the Hydration of Portland Cement
Effect of citric acid and the hemihydrate amount on the properties of a calcium sulphoaluminate cement. The influence of citric acid on the hydration and strength development of a calcium sulphoaluminate cement was investigated. Cement pastes were prepared by mixing calcium sulphoaluminate (C 4 A 3 Ŝ)….
Influence of Citric Acid on the Hydration of Portland Cement
Concerning the concentration of citric acid, the setting times of the fine S 3A and S2Ce cement mixed with a 0.1% (w/v citric acid solution were 94 and 116 min, respectively) (Fig. 4). ...
Influence of set retarding admixtures on calcium sulfoaluminate cement
Little published data is available to guide specification calcium sulfoaluminate cement (CSA) mixtures with citric acid retarder dosage rates capable of achieving adequate field working times, nor to understand the effect of retarder dosage on hydration and property development, representing a significant barrier to widespread CSA …
Influence of borax and citric acid on the hydration of …
In addition, citric, tartaric, and gluconic acids, and their salts, are strong retarders in high alumina cement or CSA cement [27,30, 31]. The citric acid and gluconate were shown to effectively ...
ACI 212.3R-10 Report on Chemical Admixtures for …
This report deals with commonly used admixtures other than those assigned to other ACI committees. Materials, such as mineral admixtures, used to produce concrete are not …
Effects of citric acid on the rheology, hydration and …
development of set-retarding admixtures that are compatible ... and the hydration kinetics of the alkali aluminosilicate cement (AAC). Citric acid was added at 3% by weight of cement to
Influence of Citric Acid on the Hydration of Portland Cement
The complexation of the ions by citrate was weak, which could also be confirmed by thermodynamic calculations. Only 2% of the dissolved Ca and 0.001% of the dissolved K formed complexes with citrate during the first hours. Thus, citric acid retards cement hydration not by complex formation, but by slowing down the dissolution of the clinker …
Review on Effect of Admixtures on Basic Magnesium …
the effects of chemical admixtures (citric acid) and mineral admixtures (rice husk Ash) on basic magnesium sulfate are studied respectively. the aim is to provide a theoretical reference for the further study of basic magnesium sulfate cement. Keywords: Basic Magnesium Sulfate Cement, Rice Husk Ash, Chemical Admixtures 1. Introduction
Retarders for Concrete: Types, Mechanism, and Uses
Retarders for concrete are additives or admixtures that help retard or slow the process of hardening. Builders introduce concrete retarders in order to increase the workability of concrete to allow easier handling, placement, and finishing of concrete. ... Citric Acid – Citric acid, derived from citrus fruits, forms with calcium ions to slow ...
Recent advance of chemical admixtures in concrete
1. Introduction. As an essential component of concrete, different types of chemical admixtures have been widely applied to improve properties. Chemical admixtures enable the manufacture and construction of high performance ready-mix and also precast concretes [1, 2].This paper reviews recent developments and research on …
(PDF) Influence of polycarboxylate superplasticizer, citric acid and
Influence of polycarboxylate superplasticizer, citric acid and their combination on the hydration and workability of calcium sulfoaluminate cement September 2021 Cement and Concrete Research 147(1 ...
Influence of citric acid and sodium gluconate on hydration …
The results confirmed that tartaric acid is a powerful retarder for CSAB cement; it showed a stronger retarding effect than citric acid, sodium gluconate, borax, and molasses. A proper tartaric acid dosage (≤ 0.75 %) extended the initial setting time of CSAB cement from 5 min to up to 154 min without compromising long-term strength.
Quantifying the Workability of Calcium Sulfoaluminate Cement …
Nine CSA cement paste specimens were prepared with three different dosage rates of the PCE (0%, 0.1%, and 0.5% dry mass of PCE by mass of cement) and three different contents of citric acid (1%, 2%, and 4% dry mass of CA by mass of cement). These dosage rates were chosen in the range commonly reported in the …
Influence of set retarding admixtures on calcium sulfoaluminate cement
Setting times of OPC cement, CSA1 cement with 0 to 3% dosage of citric acid, and the CSA2 cement with 0 to 1% dosage of citric acid are shown in Fig. 8. Without retarder, the CSA1 and CSA2 cements had significantly shorter initial and final set times than the corresponding OPC mixture - with the time to initial set being 99 and 83 min …
Advances of Chemical Admixtures for Modern Concrete
It is an effective method to use chemical admixtures to inhibit the shrinkage of cement-based materials. Polycarboxylate plasticizer (PCE) is an important chemical admixture in cement-based materials and is widely used in practical engineering. ... The results show that the acid-to-ether ratio, sulfonic acid group, ester group, and the type of ...
[PDF] Development of Sucrose and Citric Acid as the Natural …
DOI: 10.1016/J.PROENV.2013.02.075 Corpus ID: 53999933; Development of Sucrose and Citric Acid as the Natural based Admixture for Fly Ash based Geopolymer @article{Kusbiantoro2013DevelopmentOS, title={Development of Sucrose and Citric Acid as the Natural based Admixture for Fly Ash based Geopolymer}, author={Andri …
Effect of citric acid on the hydration of portland cement
The hydration of portland cement in presence of citric acid has been investigated. The results indicate that 0.1% citric acid accelerates whereas too high a dose (> 0.1%) of citric acid retards the hydration. Electrical conductivity measurements of the paste indicate that in the presence of citric acid, the concentration and the mobility of …
(PDF) Effect of Citrate Salts of Li+, Na+ and K+ on Some …
The citric acid was used as a water reducer, setting time retarder and workable time extender admixture on ordinary Portland cement (OPC). ... Maivaganam PN. Chemical admixtures for concrete, (2ed.)
Effects of citric acid on the rheology, hydration and strength
Citric acid was used by Xu et al. (2018) to delay the setting of alkali aluminosilicate cement, increase the rheology of the fresh mix, and control the hydration kinetics. The results demonstrated ...
Using Citric Acid as an Admixture and it's Influence on
that concrete containing citric acid has good performance after 180 days exposure to salt ... time of concrete [3]. Set-controlling admixtures can be divided into several categories, based on
[PDF] Using Citric Acid As An Admixture and It's Influence on …
Using Citric Acid As An Admixture and It's Influence on Some Properties of Concrete. The objective of this investigation is to find the effectiveness of the citric acid as retarding …
CHEMICAL ADMIXTURES FOR CONCRETE (ASTM C494)
Citric Acid: 6.1 (2018) 5.61: Less: 2.52: 1 to 12 fluid ounces per 100 lbs of cement: 11/3/2025: Polychem SPC: A, F: Calcium Nitrate - Sodium Thiocyanate: ... ** When the Contractor is permitted to reduce cement content by adding chemical admixtures, the dosage of admixture shall be the dosage used in ASTM Designation C494 for qualifying …
Effects of Borax, Sucrose, and Citric Acid on the Setting Time …
In addition, when citric acid was used as a retarder for FA-AAM, some researchers found that citric acid did not act as a retarder but as an accelerator of the …
Influence of polycarboxylate superplasticizer, citric acid and …
Moreover, Tan et al. [36] highlighted a decrease of the PCE's dispersing efficiency in CSA pastes when the dosage of borax was more than 0.4% by mass of cement. Considering citric acid as one of the primary set retarding agents recommended for CSA, little research has investigated the combined effect of PCE with citric acid on …