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t Based on desulfurized gypsum, the waterproof agent developed by modifying polyvinyl alcohol （PVA） catalyzed by liquid alkali activated Polymethyl hydrogen siloxane （PMHS） cooperated with portland cement to develop high-strength waterproof gypsum. The effects of modified PVA waterproofing agent and portland cement on the surface water absorption, mechanical properties and softening coefficient of desulfurization gypsum standard test block were investigated. The connection form of strong waterproof gypsum developed by modified hydrophobic agent and portland cement independently and cooperatively was determined by infrared spectrum. The influence of different additives on the thermal stability of gypsum was analyzed by thermogravimetry. The research shows that the best ratio of modified PVA waterproof agent and portland cement to produce high-strength waterproof gypsum is: waterproof agent 120 g and portland cement 150 g. At this time, the surface water absorption rate is 9. 35%, the absolute dry compressive strength is 22. 54 MPa, and the softening coefficient is 67. 57%. At the same time, the thermal stability of gypsum board is effectively improved. [ABSTRACT FROM AUTHOR]

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Copyright of Bulletin of the Chinese Ceramic Society is the property of Bulletin of the Chinese Ceramic Society Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Sprayed fireproofing materials in underground coal mine roadways are limited due to their poor adhesion, easy-to-crack, easy-to-fall off and poor sealing effect. This study therefore develops a fireproofing spraying material with fly ash as aggregate, ordinary silicate cement, sulphur-aluminate cement and gypsum as base material, and re-dispersible latex powder(VAE)as additive. Specifically, we conducted the uniaxial compressive strength test and used coal rock multiphase multi-field triaxial dynamic seepage experimental system, and scanning electron microscopy to study the effects of dispersible latex powder on the adhesive, cementation, mechanical, and blocking properties of the spray material. The results show that adding dispersible latex powder could promote the formation of filamentary bonding bridges in the hydration product, and realize the riveting and bridging of the binder bridges with the hydration products to form a dense network structure. This improves the cracking resistance of the spray material and enhances the material's adhesion, sealing and cementing properties when combined with coal. Adding 1 % VAE spraying material can fully encapsulate the coal body, forming a dense coating on the surface of the coal body, effectively isolating the air from contact with the coal body, thus preventing spontaneous combustion of coal. The proposed materials are useful in preventing spontaneous combustion of coal at the top of the roadway.

:F1y ash,cement,coal gangue and water are used as backfill materials to backfill in mine, which can not only reaiize the large-scale utiiizaiion of soiid waste resources, but ako effectively control the surface subsidence of the mine. In this study, the rheologccal properiies, mechanical properiies and hydration characteristics of cemented gangue backfill werestudeed. The rheologccal properties, compressive strength, hydration products and nicrostructure of gangue backfill werestudeed respectively. The results showed that when the content of 325 ordinary Portland cement was 15%, the content of low cakum lly ash !s more than 20%,and the mass concentration of slurry was kept above 77%,the minimum compressive strength of the prepared gangue backfill sample at 28 d curing age was more than 4. 229 MPa, which provided good roof support for underground backfill mining. Secondly, the influence of fly ash content and slurry mass concentrafion on the rheological properties of gangue filfing slurry were Investigated by rheological test, the corresponding rheologccal parameters and rheologcal equation fitting of filing slurry are obtamed. In addition, the mineral composition, hydration products and rmcrostructure of gangue cemented backfill materials were studied. Therefore, this study can provide some theoretical guidance for the apphcation of sohd waste n the ield of mine backi. [ABSTRACT FROM AUTHOR]

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In order to evaluate the effects of different proportions of asphalt and Portland cement on the performance of recycled asphalt pavement materials using cold recycling techniques, laboratory performance of foamed asphalt stabilized mixture for base course was studied, and a suitable laboratory ratio was designed. The content of cement is 0.5%, 0.75% and 1.0% respectively, and that of asphalt is 1.75%, 2.0% and 2.5% respectively. The mixture of typical asphalt pavement materials frequently encountered during road repair was evaluated, taking into account RAP materials from the pavement and unbonded crushed aggregate. At the same time, the indirect tensile strength, indirect tensile fatigue strength, elastic modulus and rutting resistance of the mixture were analyzed. The results show that the optimum values of cement and asphalt are 1.0% and 2.5% respectively. Rap material extracted from thin layer surface dressing is the best surfacing material for cold foamed pavement in-situ recycling technology. [ABSTRACT FROM AUTHOR]

To realize the resource utilization of zero-discharge production wastewater from the ready-mixed concrete mixing plant, this experiment combined the microstructure detection techniques of the mercury-pressure method, scanning electron microscope, and X-ray diffraction to investigate the role and influence law of wastewater admixture and its storage time on the mechanical properties and microstructure of concrete. The results showed that the 7-day compressive strength of mortar with 100% wastewater admixture increased by 35% and the 28-day compressive strength increased by 16% compared with that of ordinary mortar, while the compressive strength of specimens with other wastewater admixtures increased to a certain extent; the alkaline environment provided by wastewater was beneficial to promote the hydration reaction of cement. The micro-particles contained in the wastewater of ready-mixed concrete production play a filling and bonding role in the microstructure of concrete and improve the compactness of concrete. [ABSTRACT FROM AUTHOR]

A composite of petroleum coke desulfurization slag and mineral powder was used as a mud solidification agent to prepare solidified soil. Experimental studies were conducted on the slurry workability, mechanical strength, and erosion resistance of the solidified soil. The solidification effects of petroleum coke desulfurization slag and mineral powder, cement, and lime were compared, and the solidification mechanism of petroleum coke desulfurization slag and mineral powder was analyzed. The results show that the solidification effect of petroleum coke desulfurization slag and mineral powder is weaker than that of cement, but significantly stronger than that of lime. The expansion degree of its solidified soil slurry increases with the increase of petroleum coke desulfurization slag content. When the petroleum coke desulfurization slag content is 20%, the slurry has the shortest setting time, with initial and final setting times of 6.3 h and 9.9h, respectively. The unconfined compressive strength of solidified soil is the highest, reaching 1.98 MPa at 28 days. The quality loss rate and strength loss rate after 14 days of erosion are also the lowest, with 2.57% and 4.07% respectively. The curing mechanism is that the hydration reaction of the curing agent itself, the ion exchange reaction between the curing agent and soil particles, and the pozzolanic reaction can generate C-S-H gel and ettringite (AFt), which are overlapped to form a dense structure and promote the strength of soil. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Henan University of Science & Technology, Natural Science is the property of Editorial Office of Journal of Henan University of Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In order to analyze the curing effect of solid waste base curing agents on silt with high water content, and to address the technical status that the curing effect of flow curing method is difficult to control, the effect of soil curing agents prepared by ordinary silicate cement (OPC)-slag micronized powder (GBFS)-steel slag micronized powder (SS)-desulfurization gypsum (DG) system on the unconfined compressive strength of high water content silt and its curing mechanism was investigated in this paper. The curing effect of OPC-GBFS-SS-DG (O-G-S-D) system soil curing agent on silt was shown to be slightly higher than that of cement curing body at 7 d and lower than that of cement curing body at 28 d. The curing effect of O-G-S-D system soil curing agent on silt was mainly due to its ability to rapidly produce a large amount of pin-rod-like calcium alumina (AFt), which connects the silt particles together to form a three-dimensional spatial network, and the continuous increase of hydrated calcium silicate gel (CSH) at a later stage, which gradually fills the pores and forms a dense whole and the strength develops continuously. [ABSTRACT FROM AUTHOR]

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Copyright of Fly Ash Comprehensive Utilization is the property of Hebei Fly Ash Comprehensive Utilization Magazine Co., Ltd. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In order to promote the resource utilization of steel slag, based on the stability evaluation of steel slag, using lime as alkali activator, the unconfined compressive strength test, X-ray diffraction (XRD) and scanning electron microscope (SEM) were used to study the effects of different alkali-activated slag mix ratios and alkali-activated slag content on the compressive strength of slag-stabilized steel slag mixture. The hydration products and strength enhancement mechanism of slag-stabilized steel slag mixture was discussed. The research showed that the strength of the mixture increased first and then decreased with the increase of lime content, and the optimal mix ratio of lime and mineral powder was 1 ∶4. 2. Under this mix ratio, the 7 d strength of the mixture with 4. 5% alkali activated mineral powder content reached 6. 27 MPa, which met the technical requirements of high-grade pavement. With the increase of alkali-activated slag content, the compressive strength of the mixture increased, the elastic section of the load-deformation curve increased gradually, the plastic section and the descending section decreased, and the plastic deformation capacity decreased. Lime can better stimulate the potential activity of the slag-steel slag system. The hydration products included hydrated calcium silicate, hydrated calcium aluminate and Jennite. The internal honeycomb and fibrous cementitious structure made the internal structure of the mixture denser and improved the macroscopic strength and volume stability of the mixture. [ABSTRACT FROM AUTHOR]

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In order to improve the utilization rate of iron tailings and reduce the cost of grouting materials, the method of replacing river sand and fly ash with iron tailings sand and partially replacing cement with activated iron tailings powder was selected for the test. Using orthogonal test method, factors such as water cement ratio, cement sand ratio, tailings powder, and fly ash content were studied. Research showed that the influence of four factors on the strength of grouting materials was ranked in descending order: water cement ratio, tailings powder, fly ash, and cement sand ratio. Through range analysis, the optimal factor level combination for 28 days was determined to be a water cement ratio of 0. 36, a cement sand ratio of 1 ∶ 0. 6, a tailings powder content of 10%, and a fly ash content of 6%. Through contrast tests, the feasibility of completely replacing river sand and fly ash with iron tailings sand and partially replacing cement with activated iron tailings powder was clarified. Through X-ray diffraction (XRD) and scanning electron microscope (SEM) analysis, it was found that under the test conditions, the performance of grouting materials was improved by the production of tricalcium silicate, ettringite and other hydration products during the hydration and hardening process of grouting materials. Incomplete crack and hydration reaction would reduce the strength of grouting material. [ABSTRACT FROM AUTHOR]

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The optimum reaction conditions of NaOH activated fly ash were studied, and then the effects of flotation of phosphogypsum, activated fly ash, calcination of phosphorus tailings and cement on the properties of cementitious materials were explored. The mechanism of strength formation was analyzed by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The results showed that the alkali activation effect was the best when the mass fraction of NaOH was 5%, the reaction time was 3 h and the reaction temperature was 80 °C. When the mixture of phosphogypsum:activated fly ash:calcined tailings:cement =55:40:15: 5, the highest unconfined compressive strength for 7 days and 28 days is 8.3 MPa and 9.1 MPa, respectively. It can meet the strength requirements of primary road base in the specification "Technical Specification for Application of Highway Phosphogypsum Composite Stable Crushed Stone Base" (T/HBTS003--2022). SEM and XRD results showed that the hydration products of the cementing material were calcium silicate gel(C-S-H) and acicular ettringite (AFt), which were interspersed and crosslinked between the unreacted phosphogypsum to fill the gap of the material and improve the strength of the material. [ABSTRACT FROM AUTHOR]

The ultrafine composite mineral admixture (HP-UA) of fly ash-mineral powder was prepared by grinding treatment. The effects of 15%, 25% and 35% dosage on concrete mechanical properties, durability were studied. It used scanning electron microscope and X-ray diffractometer to analyze the mechanism of its effect on concrete properties. The results show that the addition of HP-UA is beneficial to the improvement of concrete mechanical properties, shrinkage resistance, water penetration resistance, chloride ion penetration resistance, sulfate corrosion resistance. It had a two-sided effect on the carbonation resistance of concrete. The particles of HP-UA had fewer apparent defects. HP-UA formed better particle gradation with cement. Its hydration produced more calcium silicate hydrate and C-S-H gel. [ABSTRACT FROM AUTHOR]

The effects of quick hardening sulphoaluminate cement, type and dosage of water-reducing agent, retarder and early strength agent on the properties of ultra-high performance concrete were studied. The results show that sulphoaluminate cement can obviously improve the early compressive strength of UHPC, and its optimum content is 15%. The water reducing effect of three commercially available polycarboxylic acid water-reducing agents in the fast hardening UHPC system is significantly different. The fast hardening UHPC should be prepared with water reducing agent B, and its optimum dosage should be 0.6%. The fast hardening ultra-high performance concrete should be prepared by adding early strength agent lithium carbonate and calcium oxide expansion agent. The fast hardening ultra-high performance concrete prepared by replacing 15% Portland cement with sulphoaluminate cement, adding 0.2% tartaric acid as a retarder, adding 0.2% lithium carbonate as an early strength agent, and adding 3% calcium oxide expansion agent, whose 28d compressive strength and flexural tensile strength were 124.7MPa and 17.8MPa respectively, the frost resistance grade was F800, and the abrasion was only 0.5kg/m2, which has good mechanical properties and durability. [ABSTRACT FROM AUTHOR]

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Copyright of Coal Science & Technology (0253-2336) is the property of Coal Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In order to solve the blockage problem of 3D printing of high viscosity cement, physical simulation experiments were carried out by building up a 3D printing platform. The hardened products were detected by X-ray diffraction (XRD) and scanning electron microscope (SEM), and the internal flow field of printhead was analyzed by finite element software Polyflow. Combining with tests results and numerical simulation results, the reasons for the blockage problem were confirmed. The results show that the setting time of high viscosity cement is 10 ~ 23 min, which is faster than that of ordinary Portland cement to form prismatic crystals. The internal pressure gradient of printhead reaches a peak value 113.9 kPa at extrusion outlet, and the slurry in the channel is transported in the form of plug flow. During the process of 3D printing, part of the slurry adheres to the surface of the screw, and the product formed by rapid hardening is embedded in the micro-convex surface of the screw. The unadsorbed slurry in the channel is transported in the form of plug flow under the action of high pressure difference in the cylinder, and the liquid phase migration occurs at the variable diameter in the cylinder, which eventually causes the printing blockage problem. The research results can provide theoretical support for the design of 3D printing printhead used for high viscosity cement. [ABSTRACT FROM AUTHOR]

Lead zirconate titanate-Portland cement composites with different volume fractions (30%, 40%, 50%, 60%) were prepared by pressing method with lead zirconate titanate as the functional phase and ordinary Portland cement P.O 42.5 as the matrix material, and the dielectric, piezoelectric and electromechanical coupling properties of the composites were studied. The results show that the doping of lead zirconate titanate with volume content below 50% can increase the probability of contact between lead zirconate titanate and enhance the connectivity, thus promoting the mutual conduction of current between lead zirconate titanate. With the increasing volume of lead zirconate titanate, the dielectric constant of the composite gradually increases, the dielectric loss gradually decreases, the piezoelectric voltage constant and piezoelectric strain constant gradually increase, and the electromechanical coupling coefficient Kt and the mechanical quality factor Qm first increase and then decrease. When the volume fraction of lead zirconate titanate is 50%, the maximum Kt is 0.15% and the maximum Qm is 33.09. When the volume fraction of lead zirconate titanate increases to 60%, the distribution uniformity becomes worse and the electromechanical coupling properties of the composites weaken. [ABSTRACT FROM AUTHOR]

When cementing geothermal wells in dry hot rocks, the bottom temperature is often as high as above 200 ℃. Aiming at the problem of strength decline of cement paste caused by high temperature at the bottom of the well under dry-hot rock conditions, this paper directly starts from the chemical composition of cement, and improves this problem by adjusting the ratio of C3S and C2S, and compounding low-heat portland cement with lower calcium-silicon ratio under the synergistic effect of silicon powder. Firstly, the mechanical properties of multiphase C3S-C2S mineral system are the best when C3S∶C2S=1.0. Combined with XRD, TGA and SEM tests, it is known that the reduction of calcium-silicon ratio has a positive effect on the formation of favorable phase xonotlite. Lowgrade cement with lower calcium-silicon ratio is introduced to strengthen G-grade cement. The results show that the compressive strength of "30% G-grade +70% low-grade cement" composite cement system (the ratio of C3S to C2S is 1.07) is 27.34 MPa under the action of 40% silicon powder. The high temperature resistance of cement paste can be greatly improved from the cement itself by properly adjusting the mineral composition in cement to make the ratio of C3S to C2S about 1.0. [ABSTRACT FROM AUTHOR]

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Currently, cemented paste backfill (CPB) is the main method for large scale tailings disposal. However, as the most commonly used cementing material in CPB, the high cost of ordinary portland cement (OPC) limits the large scale promotion and application of CPB, and the massive use of OPC is not conducive to the realization of the 11 double carbon11 goal. Thus, it is necessary to develop new cementing materials for CPB. In this paper, calcined layered double hydroxide(CLDH) was used to modify Na2CO3 activated blast furnace slag(BFS) fly ash(FA) based cementing material to make it suitable for lead zinc mine tailings CPB. Firstly, CLDH can consume CO32- and increase the pH value of reaction system, which will promote the binder reaction. Secondly, the regeneration of LDH is beneficial to the immobilization effects of heavy metals. By studying the hydration heat of the binder, reaction products, flowability and compressive strength of the CPB sample and the immobilization effects of heavy metals, the optimal ratio of the binder was obtained» The results showed that sample B5OFA5O CL5 Ca5 has the best comprehensive performance. When the mass ratio of cementitious material to tailings was 1;6 and the slurry concentration was 70%, the compressive strength of CPB samples at 3 and 28 days was 1.21 MPa and 2.77 MPa, respectively, and the immobilization effects of heavy metals meet relevant national standards. [ABSTRACT FROM AUTHOR]

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