investigation of expansion properties of cement paste with

Investigation of expansion properties of cement paste with ...

Dec 30, 2017  The expansion performance of CFA cement paste was investigated, contributing to a better understanding of the mechanisms for the expansion in CFA cement binder. The following conclusion can be drawn based on this study: 1. CFA can be used as admixture in cement, as its pozzolanic reactivity index is over 70%.

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Investigation of expansion properties of cement paste with ...

This work aims to study the expansion performance of cement paste with CFA, contributing to a better understanding of the expansion mechanism of system. Thus the effects of CFA content, fineness, and curing conditions on expansion of the cement paste were investigated. The hydration products were analyzed by XRD, FT-IR and SEM.

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Investigation of expansion properties of cement paste with ...

Investigation of expansion properties of cement paste with circulating fluidized bed fly ash Author: Chen, Xuemei Gao, Jianming Yan, Yun Liu, Yuanzheng Journal: Construction and Building Materials

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Investigation of Physical Properties of Graphene-Cement ...

properties of the main binder, namely, Portland cement paste [7]. Introduction of nanomaterials in cement paste reduces the porosity and rate of hydration leading to the development of stronger and more durable products [7]. The structure of the hydrated gel is also affected by the introduction of nanomaterials at a nano-level [8,9]. The

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Expansive Cement - Manufacture, Properties, Types and Uses ...

Aug 27, 2018  Expansive Cement – Manufacture, Properties, Types and Uses. Expansive cement is special type of cement when mixed with water, which forms a paste that tends to increase in volume to a significantly greater degree than Portland cement paste after setting. The expansion of the cement mortar or concrete is compensated for the shrinkage losses.

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Investigation of expansion properties of cement paste with ...

Investigation of expansion properties of cement paste with circulating fluidized bed fly ash Author: Chen, Xuemei Gao, Jianming Yan, Yun Liu, Yuanzheng Journal: Construction and Building Materials

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Investigation on key properties controlling early-age ...

Investigation on key properties controlling early-age stress development of blended ... coefficient of thermal expansion, and autogeneous deformation. The ... cement paste it is assumed that the heat of hydration of cement paste in concrete is the same as that of the paste alone. By that, it is implicit ...

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The effect of the source of cement SO3 on the expansion of ...

Jun 01, 2016  In order to evaluate the risk of the source and quantity of cement SO 3 on the expansion properties of mortars, this paper studied the influence of Gypsum, Bassanite and clinker sulfate on the cement paste expansion and the formation of delayed ettringite. The investigation covers the mortar cured at 20 °C and 80 °C and stored in water.In contradiction to many studies, the results showed ...

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Cement : Physical Properties and Types of Cement

to the ability of a hardened cement paste to retain its volume after setting without delayed expansion. This expansion is caused by excessive amounts of free lime (CaO) or magnesia (MgO). Most Portland cement specifications limit magnesia content and expansion. The cement paste should not undergo large changes in volume after it has set.

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Selection and use of CaO-Expanding Cements

development is discussed. Cement systems were developed and their performances indicated by expansion tendency, consistency behaviour, cement paste properties. The slurry selection process was strict, rigorous and based on the best value basis. In order to provide a comprehensive investigation of behaviour patterns, the major issues were

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Experimental Study on Mechanical Properties of Cemented ...

Nov 16, 2019  To investigate the effect of temperature-chemical coupling on the mechanical properties of cemented paste backfill, three temperatures (20°C, 35°C, and 50°C) and sodium sulfate solution mass concentrations (3%, 5%, and 7%) are applied to simulate the complex environment in a mine. Uniaxial compressive strength and the CPB stress-strain relationship are investigated by applying stress, and ...

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Numerical investigation of the external sulfate attack ...

Jan 16, 2019  The growth of ettringite will produce a locally microscopic stress, and further lead to the micro-crack initiation in the cement paste near the pore [27, 43], so as to cause the macroscopic expansion in concrete. Thus, the ESA-induced expansion of concrete can be described as a micro–macro interactive process.

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Expansive Cements - DTIC

alumina cement with lime, accelerated the foi-mation of ettringite. The self-sLressing cement was an interground mixture of selected proportions of portland cement, hig, alumina cement, and gypsum. Expansion of the desired quantity was obtained by control of the gypsum and a

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Properties of concrete containing ground granulated blast ...

Jan 01, 2012  Introduction. The most important effects of elevated temperature on concrete are: dehydration of cement paste, porosity increase, modification in moisture content, thermal expansion, alteration of pore pressure, strength loss, thermal cracking due to incompatibility, thermal creep and thermal spalling due to excessive pore pressure , .Water distribution and transport, whether in

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Experimental investigation of expansion behavior and ...

May 22, 2021  (1) Volume expansion test. The raw materials were weighed according to the proportions shown in Table 2.After mixing the prepared raw materials into the grout without bubbles using a mixer, the stirred grout was poured into a steel cuboid mold with a 70.7- × 70.7-mm 2 base, with an initial casting depth of 70.7 mm. According to the preliminary experimental results, the volume expansion

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Investigation on mechanical properties, durability and ...

Aug 17, 2011  SSBC cement paste also shows low water requirement and decreased setting time, while autoclaved soundness can not meet the requirement of ASTM C151-09 (0.5% expansion ratio for blended cement). The setting time of steel slag blended cement paste with chemical activator (SSBCJ) reduces sharply; both boiling soundness and autoclaved soundness of ...

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"AN EXPERIMENTAL INVESTIGATION OF THE PROPERTIES OF ...

In this study different modification methods of rubber aggregate were investigated to enhance the bonding strength between rubber particles and cement paste. Five types of modified rubber particles (NaOH-treated rubber, NaOH-treated rubber coated with normal cement, NaOH-treated rubber coated with cement containing silica fume, NaOH-treated rubber coated with cement containing silica fume

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THE EFFECT OF GROUND GLASS WASTE ON PROPERTIES OF

Keywords: Ground waste glass, Hardened cement paste, Mortar, Strength, Microstructure The article addresses the effect of finely ground waste glass on the properties of hardened cement paste and mortar. Cement mixtures were formulated by replacing 0 %, 5 %, 10 %, 15 %, 20 %, 25 %, and 30 % of cement with ground waste glass.

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Theoretical Modeling of the Effects of Neutron Irradiation ...

Sep 06, 2016  Three different types of volumetric strains in concrete under neutron irradiation were considered in the model: expansion of aggregates, shrinkage of hardened cement paste, and thermal expansion of the two phases under the heat of neutron irradiation.

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Investigation on key properties controlling early-age ...

Investigation on key properties controlling early-age stress development of blended ... coefficient of thermal expansion, and autogeneous deformation. The ... cement paste it is assumed that the heat of hydration of cement paste in concrete is the same as that of the paste alone. By that, it is implicit ...

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"AN EXPERIMENTAL INVESTIGATION OF THE PROPERTIES OF ...

In this study different modification methods of rubber aggregate were investigated to enhance the bonding strength between rubber particles and cement paste. Five types of modified rubber particles (NaOH-treated rubber, NaOH-treated rubber coated with normal cement, NaOH-treated rubber coated with cement containing silica fume, NaOH-treated rubber coated with cement containing silica fume

get price

Investigation on mechanical properties, durability and ...

Aug 17, 2011  SSBC cement paste also shows low water requirement and decreased setting time, while autoclaved soundness can not meet the requirement of ASTM C151-09 (0.5% expansion ratio for blended cement). The setting time of steel slag blended cement paste with chemical activator (SSBCJ) reduces sharply; both boiling soundness and autoclaved soundness of ...

get price

Cement : Physical Properties and Types of Cement

to the ability of a hardened cement paste to retain its volume after setting without delayed expansion. This expansion is caused by excessive amounts of free lime (CaO) or magnesia (MgO). Most Portland cement specifications limit magnesia content and expansion. The cement paste should not undergo large changes in volume after it has set.

get price

Expansive Cements - DTIC

alumina cement with lime, accelerated the foi-mation of ettringite. The self-sLressing cement was an interground mixture of selected proportions of portland cement, hig, alumina cement, and gypsum. Expansion of the desired quantity was obtained by control of the gypsum and a

get price

Experimental Study on Mechanical Properties of Cemented ...

Nov 16, 2019  To investigate the effect of temperature-chemical coupling on the mechanical properties of cemented paste backfill, three temperatures (20°C, 35°C, and 50°C) and sodium sulfate solution mass concentrations (3%, 5%, and 7%) are applied to simulate the complex environment in a mine. Uniaxial compressive strength and the CPB stress-strain relationship are investigated by applying stress, and ...

get price

[PDF] Micromechanics analysis of thermal expansion and ...

The results of a macro-scale experimental study of the effect of heating on a fluid-saturated hardened cement paste are analysed using a multi-scale homogenization model. The analysis of the experimental results revealed that the thermal expansion coefficient of the cement paste pore fluid is anomalously higher than the one of pure bulk water.

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Jeffrey J. Thomas - Northwestern University

“A colloidal interpretation of chemical aging of the C-S-H gel and its effects on the properties of cement paste” (J.J. Thomas, H.M. Jennings) Cement and Concrete Research 36, pp. 30-38 (2006). “Nanostructure of C-S-H gel in cement paste as a function of

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Effects of carbonation on micro structures of hardened ...

Feb 03, 2016  In order to investigate the effects of carbonation on the microstructure of cement concrete, the carbonation depth and microstructure of cement paste with 0.3, 0.4 and 0.5 water/cement ratio after 7, 14, 21 and 28 d accelerated carbonation were studied respectively. The results showed that with the increase of waterto- cement ratio and carbonation age, the carbonation depth was deepened

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Types and Causes of Concrete Deterioration

is significantly increased in concrete with a high water-to-cement ratio, low cement content, short curing period, low strength, and highly permeable or porous paste. Carbonation is highly dependent on the relative humidity of the concrete. The highest rates of carbonation occur when the relative humidity is maintained between 50% and 75%. Below

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THE EFFECT OF GROUND GLASS WASTE ON PROPERTIES OF

Keywords: Ground waste glass, Hardened cement paste, Mortar, Strength, Microstructure The article addresses the effect of finely ground waste glass on the properties of hardened cement paste and mortar. Cement mixtures were formulated by replacing 0 %, 5 %, 10 %, 15 %, 20 %, 25 %, and 30 % of cement with ground waste glass.

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Jeffrey Thomas Publications (pdf) - Northwestern University

Cement and Concrete Research 37, pp. 319-324 (2007). Download pdf "Decalcification shrinkage of cement paste" (J.J. Chen, J.J. Thomas, and H.M. Jennings) Cement and Concrete Research 36, pp. 801-809 (2006). Download pdf "A colloidal interpretation of chemical aging of the C-S-H gel and its effects on the properties of cement paste"

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李犇 - 佛山科学技术学院 - fosu.cn

Investigation of the rheological properties of cement paste with different superplasticizers based on CF and RDS methods. RheoCon 2019. [12] Ben Li. Micro-mechanical modelling for the prediction of alkali-silica reaction (ASR) expansion: influence of curing temperature conditions. 14th International Conference on Recent Advances in Concrete ...

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Investigation of the dimensional stability in DSP cement paste

The dimensional change of hardened cement paste due to external factors such as humidity and temperature change has significant impact on the design and performance of concrete structures. This work deals with shrinkage and thermal expansion of cement pastes with low w/c ratio and densified with silica fume, i.e., DSP paste (Densified with Small Particles).

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