The Experts below are selected from a list of 42 Experts worldwide ranked by ideXlab platform
Ruiquan Jia - One of the best experts on this subject based on the ideXlab platform.
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a novel Gypsum based self leveling mortar produced by phosphorus Building Gypsum
Construction and Building Materials, 2019Co-Authors: Qiang Wang, Ruiquan JiaAbstract:Abstract Due to the higher 30-min slump loss and the lower 1-day strength of phosphorus Building Gypsum (PBG), its use for Gypsum-based self-leveling mortar is limited, which makes its recycling low value-added and ineffective. In this work, PBG is modified by adding calcium sulfoaluminate cement 42.5R (S) and three types of ground granulated blast furnace slags (GGBSs), which are ordinary GGBS (OG, d50 = 11.3 μm), ultrafine GGBS A (UA, d50 = 3.67 μm) and ultrafine GGBS B (UB, d50 = 2.65 μm), to prepare PBG-based self-leveling mortar (PSLM). When adding S alone, the 30-min slump loss and 1-day strength of PSLM are the highest. GGBS replacing S can decrease 30-min slump loss and 1-day strength. The 30-min slump loss decreases with smaller GGBS particle size. The increase in hydration degree caused by the decrease in GGBS particle size does not cause an obviously negative effect on the slump of PSLM. UA and UB can reduce 30-min slump loss to less than 3 mm by decreasing plastic viscosity growth and yield stress. When the mix proportion of S and GGBS is optimum, the hydration reactions of S and GGBS promote each other, which ensures the higher 1-day strength. The hydration degrees increase, the microstructure becomes denser, and the 1-day strength increases with smaller GGBS particle size is. A novel PSLM with good performances meeting the requirements of JC/T 1023-2007 (Gypsum-based self-leveling floor compound) can be prepared by adding S and UA/UB, which is beneficial for the comprehensive utilization of phosphoGypsum.
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an investigation on the anti water properties of phosphorus Building Gypsum pbg based mortar
Journal of Thermal Analysis and Calorimetry, 2019Co-Authors: Qiang Wang, Shiyu Zhuang, Ruiquan JiaAbstract:This study aimed to manufacture phosphorus Building Gypsum (PBG)-based mortar with a high water resistance coefficient and to explore the anti-water mechanism of PBG-based mortar containing ground granulated blast furnace slag (GGBS) and calcium hydroxide (CH). The main hydration products of PBG-based mortar were CS(A)H and ettringite (AFt), along with CsH2; the chemical reaction 2A + 6CH + 6CsH0.5 + 55H → 2(C3A·3Cs·32H) occurred in PBG-based mortar; and AFt was produced gradually after the majority of the CsH0.5 was hydrated into CsH2. Gelatinous CS(A)H densely coated the CsH2 crystals to inhibit the connection between CsH2 and water. AFt crystals prevented the CsH2 crystals from water corrosion through the complex actions of the AFt crystals coating the surface of the CsH2 crystals and transforming the direct contact among the CsH2 crystals into the indirect contact among the CsH2 crystals. The contents and morphologies of AFt were the key factors for increasing the water resistance coefficient of PBG-based mortar. As mPG:mGGBS:mCH = 240:160:15, the water-saturated strength and water resistance coefficient of PBG-based mortar reached 20.8 MPa and 0.89, which meant that as long as the mix proportion was appropriate, PBG-based mortar with a high water resistance coefficient can be successfully produced.
Qiang Wang - One of the best experts on this subject based on the ideXlab platform.
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a novel Gypsum based self leveling mortar produced by phosphorus Building Gypsum
Construction and Building Materials, 2019Co-Authors: Qiang Wang, Ruiquan JiaAbstract:Abstract Due to the higher 30-min slump loss and the lower 1-day strength of phosphorus Building Gypsum (PBG), its use for Gypsum-based self-leveling mortar is limited, which makes its recycling low value-added and ineffective. In this work, PBG is modified by adding calcium sulfoaluminate cement 42.5R (S) and three types of ground granulated blast furnace slags (GGBSs), which are ordinary GGBS (OG, d50 = 11.3 μm), ultrafine GGBS A (UA, d50 = 3.67 μm) and ultrafine GGBS B (UB, d50 = 2.65 μm), to prepare PBG-based self-leveling mortar (PSLM). When adding S alone, the 30-min slump loss and 1-day strength of PSLM are the highest. GGBS replacing S can decrease 30-min slump loss and 1-day strength. The 30-min slump loss decreases with smaller GGBS particle size. The increase in hydration degree caused by the decrease in GGBS particle size does not cause an obviously negative effect on the slump of PSLM. UA and UB can reduce 30-min slump loss to less than 3 mm by decreasing plastic viscosity growth and yield stress. When the mix proportion of S and GGBS is optimum, the hydration reactions of S and GGBS promote each other, which ensures the higher 1-day strength. The hydration degrees increase, the microstructure becomes denser, and the 1-day strength increases with smaller GGBS particle size is. A novel PSLM with good performances meeting the requirements of JC/T 1023-2007 (Gypsum-based self-leveling floor compound) can be prepared by adding S and UA/UB, which is beneficial for the comprehensive utilization of phosphoGypsum.
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an investigation on the anti water properties of phosphorus Building Gypsum pbg based mortar
Journal of Thermal Analysis and Calorimetry, 2019Co-Authors: Qiang Wang, Shiyu Zhuang, Ruiquan JiaAbstract:This study aimed to manufacture phosphorus Building Gypsum (PBG)-based mortar with a high water resistance coefficient and to explore the anti-water mechanism of PBG-based mortar containing ground granulated blast furnace slag (GGBS) and calcium hydroxide (CH). The main hydration products of PBG-based mortar were CS(A)H and ettringite (AFt), along with CsH2; the chemical reaction 2A + 6CH + 6CsH0.5 + 55H → 2(C3A·3Cs·32H) occurred in PBG-based mortar; and AFt was produced gradually after the majority of the CsH0.5 was hydrated into CsH2. Gelatinous CS(A)H densely coated the CsH2 crystals to inhibit the connection between CsH2 and water. AFt crystals prevented the CsH2 crystals from water corrosion through the complex actions of the AFt crystals coating the surface of the CsH2 crystals and transforming the direct contact among the CsH2 crystals into the indirect contact among the CsH2 crystals. The contents and morphologies of AFt were the key factors for increasing the water resistance coefficient of PBG-based mortar. As mPG:mGGBS:mCH = 240:160:15, the water-saturated strength and water resistance coefficient of PBG-based mortar reached 20.8 MPa and 0.89, which meant that as long as the mix proportion was appropriate, PBG-based mortar with a high water resistance coefficient can be successfully produced.
Shiyu Zhuang - One of the best experts on this subject based on the ideXlab platform.
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an investigation on the anti water properties of phosphorus Building Gypsum pbg based mortar
Journal of Thermal Analysis and Calorimetry, 2019Co-Authors: Qiang Wang, Shiyu Zhuang, Ruiquan JiaAbstract:This study aimed to manufacture phosphorus Building Gypsum (PBG)-based mortar with a high water resistance coefficient and to explore the anti-water mechanism of PBG-based mortar containing ground granulated blast furnace slag (GGBS) and calcium hydroxide (CH). The main hydration products of PBG-based mortar were CS(A)H and ettringite (AFt), along with CsH2; the chemical reaction 2A + 6CH + 6CsH0.5 + 55H → 2(C3A·3Cs·32H) occurred in PBG-based mortar; and AFt was produced gradually after the majority of the CsH0.5 was hydrated into CsH2. Gelatinous CS(A)H densely coated the CsH2 crystals to inhibit the connection between CsH2 and water. AFt crystals prevented the CsH2 crystals from water corrosion through the complex actions of the AFt crystals coating the surface of the CsH2 crystals and transforming the direct contact among the CsH2 crystals into the indirect contact among the CsH2 crystals. The contents and morphologies of AFt were the key factors for increasing the water resistance coefficient of PBG-based mortar. As mPG:mGGBS:mCH = 240:160:15, the water-saturated strength and water resistance coefficient of PBG-based mortar reached 20.8 MPa and 0.89, which meant that as long as the mix proportion was appropriate, PBG-based mortar with a high water resistance coefficient can be successfully produced.
Jiahui Peng - One of the best experts on this subject based on the ideXlab platform.
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Research on degradation mechanisms of recycled Building Gypsum
Construction and Building Materials, 2018Co-Authors: Cong Zhu, Jiahui Peng, Jianxin Zhang, Cao Wenxiang, Jiangsen LiuAbstract:Abstract In order to provide a solid theoretical foundation for the efficient reuse of waste Gypsum, the research on the degradation mechanisms of recycled Gypsum mechanical performance was carried out in this paper. The recycled Gypsum was prepared with natural Gypsum ores in the laboratory and three rational comparative methods were proposed through constraining the conditions: the preparation process, the particle size distribution and the water/Gypsum ratio. The results showed that the recycled dihydrate Gypsum was much easier to grind than the natural Gypsum ores, resulting in deteriorated particle size distribution, large specific surface area and void fraction, poor sphericity, which remarkably increased the water requirement. The increase in porosity and larger pore size due to excessive water evaporation was the determining factor leading to a significant decrease in the strength of the recycled Gypsum. However, the short columnar shape crystals seemly would only have a slight disadvantageous on the flexural strength. Moreover, the crystal morphological characteristics of dihydrate Gypsum had a decisive influence on the sphericity of recycled hemihydrate particles.
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phosphoGypsum based plastering Gypsum
2009Co-Authors: Jiahui Peng, Jindong Qu, Mei Li, Jianxin Zhang, Leng BaiAbstract:The invention discloses a phosphoGypsum based plastering Gypsum, and relates to a plastering material for a Building wall. The phosphoGypsum based plastering Gypsum mainly comprises 75 to 95 percent of phosphoGypsum based Building Gypsum, 1 to 3 percent of sierozem powder, 0.1 to 0.5 percent of retarder, 1.1 to 5.5 percent of composite water retention agent, 0.3 to 1 percent of ethylene-vinyl acetate copolymerized latex powder, and 0 to 20 percent of stuffing. The phosphoGypsum based plastering Gypsum effectively improves water retention property and lowers cost by adopting the combination of cellulose ether water retention agent and bentonite, effectively adjusts settling time and prolongs operable time by adopting the retarder, improves construction property, cohesive property and cracking resistance by doping the stuffing and the latex powder, and reduces adverse effects of impurities on the strength of plastering Gypsum by adding the sierozem powder. The phosphoGypsum based plastering Gypsum has the advantages of good workability and construction property, long operable time, high breaking resistance, compression resistance and adhesion strength, good volume stability, good cracking resistance and lower cost, and can be used for a plastering layer of the Building wall.
Jianxin Zhang - One of the best experts on this subject based on the ideXlab platform.
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Research on degradation mechanisms of recycled Building Gypsum
Construction and Building Materials, 2018Co-Authors: Cong Zhu, Jiahui Peng, Jianxin Zhang, Cao Wenxiang, Jiangsen LiuAbstract:Abstract In order to provide a solid theoretical foundation for the efficient reuse of waste Gypsum, the research on the degradation mechanisms of recycled Gypsum mechanical performance was carried out in this paper. The recycled Gypsum was prepared with natural Gypsum ores in the laboratory and three rational comparative methods were proposed through constraining the conditions: the preparation process, the particle size distribution and the water/Gypsum ratio. The results showed that the recycled dihydrate Gypsum was much easier to grind than the natural Gypsum ores, resulting in deteriorated particle size distribution, large specific surface area and void fraction, poor sphericity, which remarkably increased the water requirement. The increase in porosity and larger pore size due to excessive water evaporation was the determining factor leading to a significant decrease in the strength of the recycled Gypsum. However, the short columnar shape crystals seemly would only have a slight disadvantageous on the flexural strength. Moreover, the crystal morphological characteristics of dihydrate Gypsum had a decisive influence on the sphericity of recycled hemihydrate particles.
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phosphoGypsum based plastering Gypsum
2009Co-Authors: Jiahui Peng, Jindong Qu, Mei Li, Jianxin Zhang, Leng BaiAbstract:The invention discloses a phosphoGypsum based plastering Gypsum, and relates to a plastering material for a Building wall. The phosphoGypsum based plastering Gypsum mainly comprises 75 to 95 percent of phosphoGypsum based Building Gypsum, 1 to 3 percent of sierozem powder, 0.1 to 0.5 percent of retarder, 1.1 to 5.5 percent of composite water retention agent, 0.3 to 1 percent of ethylene-vinyl acetate copolymerized latex powder, and 0 to 20 percent of stuffing. The phosphoGypsum based plastering Gypsum effectively improves water retention property and lowers cost by adopting the combination of cellulose ether water retention agent and bentonite, effectively adjusts settling time and prolongs operable time by adopting the retarder, improves construction property, cohesive property and cracking resistance by doping the stuffing and the latex powder, and reduces adverse effects of impurities on the strength of plastering Gypsum by adding the sierozem powder. The phosphoGypsum based plastering Gypsum has the advantages of good workability and construction property, long operable time, high breaking resistance, compression resistance and adhesion strength, good volume stability, good cracking resistance and lower cost, and can be used for a plastering layer of the Building wall.
