Effects of Modified Glycerol Distillation Residues MGDR

The feasibility of modified glycerol distillation residues MGDR used for chemical additives of cement was studied MGDR showed good grinding and strengthen effect which was similar with triethanolamine TEA and the performance of MGDR was better in PC 32 5 Samples with MGDR showed lower heat of hydration than samples with same dosages of TEA and the

Set retarding Effects of Sugars in Portland Cement Pastes

DURING an investigation of the retardation of setting in Portland cement pastes by a series of sugars the disaccharide αα trehalose was found to possess only weak retarding properties while


SINTEF REPORT TITLE setting and or hardening of Ordinary Portland Cement OPC and OPC based concrete Both Figure 2 1 The effects of setting and hardening accelerators upon the rate of heat evolution Q W kg or temperature T oC during hydration of cement

Initial and Final Setting time of Cement Effects How

Oct 06 2017 · The time at which cement completely loses its plasticity and became hard is a final setting time of cement Or The time taken by cement to gain its entire strength is a Final setting time of cement For Ordinary Portland Cement The Final Setting Time is 600 minutes 10hrs Significance of calculating Initial and final setting time of cement

Effects on Setting Strength Moisture Resistance and

Effects on Setting and Linear Changes of Sorel s Cement 415 Table 3 Effect of Portland cement on moisturizing ingress characteristics of oxysulphate cement Conc of g s 25 O Be Dry mix composition 1 2 Volume of g s 70 mL One part by weight of magnesia Temperature 30 ± 2 OC Two parts by weight of dolomite additive

What is the significance of setting time of cement Quora

The time between the water is added to cement till it starts losing its plasticity is called as initial setting time The time between which water added to cement till it has come in hardened state is called as final setting time Setting tim

Cold Weather Concreting Portland Cement Association

Concrete Technology Concrete Construction Cold Weather Concreting Weather conditions at a jobsite – hot or cold windy or calm dry or humid – may be vastly different from the optimum conditions assumed at the time a concrete mix is specified designed or selected – or from laboratory conditions in which concrete specimens are stored and tested

Alternative Fuels and Their Effects on Portland Cement

Cement produced from the forest trimmings burn experienced low early age but high long term strength development Cement produced from the glycerin burn experienced delayed setting times and low strengths at all ages which may have been partially due to the large percentage of P2O5 in the glycerin

Effect of clinker free lime and cement fineness on the

Studies conducted on the effect of clinker free lime on the cement properties were very low and for the purpose of producing quality material we studied the effect of the clinker free lime on the cement physicochemical properties like the expansion the setting time and the compressive strength For this two types of clinker were

Effect of Soaps on the Properties of Portland Cement

Calcium and sodium stearate soap additions in the ordinary portland cement have been studied by mixing 0 5 1 0 1 5 2 0 2 5 and 3 0 per cent respectively by weight of cement Cement and sand mortar in the ratio of 1 3 with diiferent percentages of additives were tested for workability and water retention properties It was observed that calcium soap was more effective in increasing the

Effects of Cement Particle Size Distribution on

EFFECTS OF CEMENT PARTICLE SIZE DISTRIBUTION ON PERFORMANCE PROPERTIES OF PORTLAND CEMENT BASED MATERIALS D P Bentz a E J Garboczi a C J Haecker b and O M Jensen c a Building and Fire Research Laboratory Building 226 Room B 350 National Institute of Standards and Technology

Setting Time of Cement Concrete Stages and Processes

Stages of setting of cement setting times of cement and factors affecting and initial and final setting time of different cements and various processes involved are discussed When water is mixed with cement to form a paste reaction starts In its pure form the finely ground cement is extremely sensitive to water

Effects of Substances on Concrete and Guide to Protective

Portland cement concrete is durable in most natural environments however concrete is sometimes used in areas where it is exposed to substances that can attack and deteriorate it This publication discusses the effects of many substances on concrete and provides guidelines to protective treatments

Strength and Durability Assessment of Portland Cement

We investigated the effects of hydrogen rich water HRW on the strength and durability of Portland cement mortars We comparatively assessed the performances of HRW based mortars HWMs with respect to cement mortars fabricated from control water CWM The results indicate that the use of HRW significantly improves the compressive flexural and splitting

Art 49 Mixtures Of Clay And Other Materials With Cement

381 Table 93 shows the effect of clay on the time of setting and soundness of neat cement The effect of small percentages of clay on the time of setting of Portland cement is not very marked but with natural cement even ten per cent of clay retards the setting in a marked


THE EFFECT OF SUGAR ON SETTING TIME OF VARIOUS TYPES OF CEMENTS Bazid Khan and Bulent Baradan ABSTRACT The objective of this research is to investigate the influence of sugar s of different origins Beet Cane on the setting times of cement pastes Sugar is incorporated with three different types of cements under three different curing

The Effects of Ethylene Glycol on a Cement DeepDyve

The effects of ethylene glycol on the setting reactions of hydrating Portland cement and on the eventual structure of the hydrated cement paste have been studied by a combination of techniques including solvent extractions with solvents of varying polarities scanning electron microscopy and X ray powder diffraction When ethylene glycol EG is solidified with cement


Sep 22 2016 · Factors Affecting the Setting and Hardening of Portland cement 1 The Impact of Cement s Composition The mineral composition of cement and their ratios are the main factors affecting the setting and hardening of cement As mentioned above various mineral components will reveal different characteristics when reacting with water

Alternative fuels and their effects on portland cement

Get this from a library Alternative fuels and their effects on portland cement Wesley Folta Steve Duke Robert Barnes Anton K Schindler Auburn University Master s Theses Civil Engineering The production of portland cement is a complex process involving several materials complex systems and temperatures on the order of 1500̊ ̊C

Effects of Modified Glycerol Distillation Residues MGDR

The feasibility of modified glycerol distillation residues MGDR used for chemical additives of cement was studied MGDR showed good grinding and strengthen effect which was similar with triethanolamine TEA and the performance of MGDR was better in PC 32 5 Samples with MGDR showed lower heat of hydration than samples with same dosages of TEA and the initial heat rate of

Calcium sulfate gypsum cement

Although CAC does not set faster than portland cement it does develop strength at high temperature obliterating the effect of any conversion reactions Calcium sulfate gypsum cement Crystallization of gypsum needles from a hydrated gypsum cement is the cause of set ting and hardening that has been exploited by the wallboard industry

Setting Of Mixture of Cement with Sand Time and Fly Ash

Setting Of Mixture of Cement with Sand Time and Fly Ash Chemistry Science Fair Project Experiments Chemistry Models Exhibition Ideas Expo Topics for Kids and also Organics Chemistry Science ideas for CBSE ICSE Middleschool Elementary School for 5th 6th 7th 8th 9th and High School Students

ISG Product Portland Cement Association

Discusses how different cement characteristics affect properties of fresh and hardened concrete Cement characteristics include chemical composition main composition Bogue calculation alkalies sulfates minor components loss on ignition insoluble residue and physical properties fineness particle size distribution setting compressive strength heat of hydration soundness

Calcium Nitrite Effect On Setting Of Cement At Various

Calcium Nitrite Effect on Setting of Cement at Various Temperatures superplasticiser with mild retardation effect based on modified lignosulfonates and polyoxycarbon acids and conformed to ASTM C494 80 types A Band D chloride free Details of Mixes Four cement pastes were prepared for the purpose of measuring setting times

Role of Gypsum in Cement and its Effects

The mixture then sent to final grinding process For ordinary Portland cement it remains between 3 to 4 and in case of Quick setting cement it can be reduced up to 2 5 Role of Gypsum in Cement The main purpose of adding gypsum in the cement is to slow down the hydration process of cement once it is mixed with water

Effects of hydroxyethyl methyl cellulose ether on the

Oct 12 2019 · Aluminate containing phases such as tricalcium aluminate C3A and dodecacalcium heptaaluminate C12A7 play a key role in the reaction between Portland cement and cellulose ether In order to simplify such impact from calcium aluminate calcium aluminate cement CAC was applied as a carrier Effects of hydroxyethyl methyl cellulose ether HEMC on the hydration of CAC were

8 Main Cement Ingredients Their Functions Civil

Cement as a binding material is a very important building material Almost every construction work requires cement Therefore the composition of cement is a matter of great interest to engineers For understanding cement composition one must know the functionality of Cement ingredients

US5340385A Hydraulic cement set accelerating admixtures

New set accelerating admixtures for hydraulic cement compositions are disclosed These admixtures incorporate known set accelerators and certain low molecular weight glycols e g glycerol and ethylene glycol are found to be surprisingly effective in decreasing the initial set time of hydraulic cements mortars and concretes and are advantageous as reduced temperature set accelerators