Which acid is used to dissolve cement and why Quora
Concrete is made of a mixture of an aggregate cement and water. Aggregates can be one or more of sand natural gravel or crushed stone. Once formed the water reacts with the cement to form a calcium-silicate hydrate with curing. Various additi
Get Price
Wood-Cement Composites Effect of Model Compounds on
This study investigated the relative effects of specific model compounds commonly found in wood on the tensile splitting strength and hydration characteristics of Type I portland cement. Model compounds representing classes of wood components were added to cement at
Get Price
Effects of acetic acid on early hydration of Portland
Aug 08 2015 · These PVAs undergo hydrolysis in wet cement which results in the release of acetate groups into the pore water. To evaluate their contribution to cement hydration the present work investigates the impact of acetic acid on the early hydration of off-white Portland cement using glacial acetic acid concentrations of up to 0.20 mass (cement basis).
Get Price
Degradation of Concrete Structures and Protective Measures
Fig 4 Variation of compressive strength with acid concentration (mix ratio 1 1.5 3 W/C = 0.65) Adopted from Olusola etal 2012 . 2.3.3 Acetic acid attack Concrete use in agricultural applications may be attacked by the silage effluents containing mainly acetic and lactic acid. Acetic acid reacts with cement hydration products to form
Get Price
34 Annual Cement and Concrete Science Conference
16 00-16 15 Effect of acetic acid on early hydration of Portland cement D. Nguyen 16 15-16 30 Impact of polycarboxylate superplasticizers on polyphased clinker hydration D. Marchon 16 30-16 45 Combined effect of malic acid retarder and naphthalene superplasticiser on rheological properties and compressive strength of NaOH-activated slag J. Ren
Get Price
Effects of chemical nature of polyvinyl alcohol on early
The DH and DP of PVA have an important effect on the hydration of Portland cement. The effects of DH resulted from the variations in the amounts of fully hydrolysed PVA and the released acetate groups. Polyvinyl alcohols (PVAs) are used commonly in polymer-modified mortars to manipulate their properties.
Get Price
The Hydration and Compressive Strength of Cement Mortar
Calcium acetate is the major component of the waste solution produced in treating recycled concrete aggregate (RCA) with acetic acid. Thus the current work aims to explore the influence of calcium acetate solution on the performance of ordinary Portland cement. For this purpose cement pastes and mortars were prepared using different concentrations namely 1 2 and 3 #x0025 of calcium
Get Price
Fixation of hazardous metallurgical sludge containing Cr
in early hydration reactions due to the presence of high amount of calcium carbonate. In the present study 40 of marble dust addition to Portland cement produces several effects on the mechanism and kinetics of cement hydration 12-18 . It has ml of water or acetic acid
Get Price
Effect of citric acid on the hydration of portland cement
Nov 01 1986 · C.A A 0.4 Wt1.CAc IS 30 MIIAJTES 2 ß HOURS TIME OF HYDRATION OATS FIG. 1 Effect of citric acid on the percent free lime of Portland cement. free lime at 2 hours of hydration in the presence of 0.1° ó C.Ac. are higher than the control whereas between 2
Get Price
Prognosis Of Concrete Corrosion Due To Acid Attack
cement. According to De Belie et al. (1996) the vulnerability of concrete to attack by lactic and acetic acid decreases over the groups Portland cement without C 3A ordinary Portland cement Portland cement with fly ash blast furnace slag cement. In
Get Price
Hydration and Setting Behaviour of Strontium Aluminate
Calorimetry of strontium aluminate cement with acetic acid citric acid sodium sulfate and boric acid. The effect of sulfates on the course of hydration of strontium aluminate cement is discussed in Chapter 8.2 but the addition of gypsum up to 5 can improve the behaviour of cement during the hydration.
Get Price
34 Annual Cement and Concrete Science Conference
16 00-16 15 Effect of acetic acid on early hydration of Portland cement D. Nguyen 16 15-16 30 Impact of polycarboxylate superplasticizers on polyphased clinker hydration D. Marchon 16 30-16 45 Combined effect of malic acid retarder and naphthalene superplasticiser on rheological properties and compressive strength of NaOH-activated slag J. Ren
Get Price
Acid attack on concreteSlideShare
Apr 22 2013 · 17. ACETIC ACID ATTACKConcrete in use in agricultural applications may beattacked by the silage effluents containing mainlyacetic and lactic acid.Acetic acid reacts with cement hydration products toform calcium acetate2CH3COOH Ca (OH)2 Ca (CH3COO)2 2H2O2CH3COOH C-S-H SiO2 Ca (CH3COO)2 2H2O. 18.
Get Price
Sustainability Free Full-Text Properties of Cement
Acetic acid used for LSS modification has been reported to increase the conductivity in the initial cement paste thereby increasing the ionic concentration of Ca 2 and Al (OH) 4 −. However an excessive amount of acetic acid may cause hydration delay with increasing adsorption amount on the surface of cement paste particles .
Get Price
Effect of Limestone Powder on Acid Attack Characteristics
In comparison with the static acetic acid attack (Figs. 2 and 3) compressive strength of pastes (w/b = 0.3) exposed to the dynamic acetic acid solution (Figs. 6 and 8) apparently recovers more because the flowing liquid promotes the continued hydration. Besides it can be found from the contrasts of Figs. 3 vs. 7 Figs. 5 vs. 9 that for high
Get Price
RESEARCH DEVELOPMENTThe Portland Cement
though these metals influence early hydration reactions ultimate cement hydration is as complete as in control samples. When added as oxides or salt solutions the metals studied (lead cadmium chro-mium and mercury) were well stabilized. The stabilization of cadmium and chromium was par-ticularly good some high pH leachability of lead was
Get Price
Acid attack on concreteSlideShare
Apr 22 2013 · 17. ACETIC ACID ATTACKConcrete in use in agricultural applications may beattacked by the silage effluents containing mainlyacetic and lactic acid.Acetic acid reacts with cement hydration products toform calcium acetate2CH3COOH Ca (OH)2 Ca (CH3COO)2 2H2O2CH3COOH C-S-H SiO2 Ca (CH3COO)2 2H2O. 18.
Get Price
Effect of Cr(VI) on the hydration behavior of marble dust
Aug 01 2008 · The limestone filler has been used to solidify Cr(VI) with Portland cement and it is observed that limestone caused a hydration acceleration of Portland cement at early ages. In this reaction formation of calcium carboaluminate as results of the reaction between CaCO 3 from limestone and C 3 A from cement has been reported.
Get Price
Effect of carboxylic and hydroxycarboxylic acids on cement
Aug 18 2017 · The glycolic acid shows significant cement retardation whereas acetic acid does not retard. Glycolic acid was found to retard hydration via calcium chelation and surface adsorption that involves the adsorption of the calcium chelate complex preferentially on tricalcium silicate.
Get Price
SINTEF REPORT
temperature increase generated from the chemical reactions between cement and water. The hydration of cement being an exothermic reaction produces heat and if the hydration is accelerated heat is either produced earlier (setting) and/or at a faster rate (hardening). This is illustrated in Figure 2.1.
Get PriceUSAManufacture of portland cementGoogle Patents
USA US548784A USA USA US A US A US A US 548784 A US548784 A US 548784A US A US A US A US A US A US A Authority US United States Prior art keywords cement acetic acid acetate dry portland cement Prior art date Legal status (The legal status is an assumption and is
Get Price
Effect of carboxylic and hydroxycarboxylic acids on cement
Aug 18 2017 · The glycolic acid shows significant cement retardation whereas acetic acid does not retard. Glycolic acid was found to retard hydration via calcium chelation and surface adsorption that involves the adsorption of the calcium chelate complex preferentially on tricalcium silicate.
Get Price
Effect of polyvinyl alcohol on the hydration of cement
To evaluate their contribution to cement hydration the present work investigates the impact of acetic acid on the early hydration of off-white Portland cement using glacial acetic acid
Get Price
Pure Portland Cementan overview ScienceDirect Topics
L. Black in Sustainability of Construction Materials (Second Edition) 2016 17.5.2 Metakaolin hydration reactions. The hydration reactions of metakaolin blends depend on the composition of the cement with which the metakaolin is blended. When blending with a CEM I pure Portland cement the principle reaction is the pozzolanic reaction between the metakaolin and portlandite arising from cement
Get Price
Acid Attack on ConcreteEffects Results of Acid Attack
Effect of Acetic Acid on Concrete Concrete in use in agricultural applications may be attacked by the silage effluents containing mainly acetic and lactic acid. Acetic acid reacts with cement hydration products to form calcium acetate 2CH 3 COOH Ca (OH) 2 ==> Ca (CH 3 COO) 2 2H 2 O
Get PriceAcid Attack on ConcreteEffects Results of Acid Attack
Effect of Acetic Acid on Concrete Concrete in use in agricultural applications may be attacked by the silage effluents containing mainly acetic and lactic acid. Acetic acid reacts with cement hydration products to form calcium acetate 2CH 3 COOH Ca (OH) 2 ==> Ca (CH 3 COO) 2 2H 2 O
Get Price
Durability of Alkali Activated Concrete-A Review
Key words Durability Sulfate Acid Thermal effects good in acetic acid with 1.15 weight loss but very poor increases due to the partial crystallization of the surface chloride resistance for the flexure behavior of beams by compared to the normal Portland cement hydration
Get PriceStructure and microstructure of gypsum and its relevance
Mar 01 2012 · Nguyen Duong Dinh Devlin Liam Peter Koshy Pramod and Sorrell Charles Christopher 2016. Effects of acetic acid on early hydration of Portland cement. Journal of Thermal Analysis and Calorimetry Vol. 123 Issue. 1 p. 489. CrossRef Google Scholar
Get Price
Early hydration of portland cement — effects of water
Jul 01 1983 · In the present work the early hydration period up to two hours has been examined for two types of Portland cement ordinary and white. This early hydration period is important for the general workability (i.e. the relative ease and homogeneity of handling placing and transporting) of mortar and concrete in practice.
Get Price
