摘   要：采用单一质心设计法研究了矿渣-偏高岭土-激发剂三元体系对地聚物流变性能和力学性能的影响，确定了最佳三元复配比例。在此基础上制备了高性能地聚物基珊瑚砂浆（HPGM），研究了其在MgSO4与NaCl复合盐溶液侵蚀作用下的耐久性能及劣化机理，并与水泥基珊瑚砂浆（PC）进行了对比。结果表明：当矿渣、偏高岭土、激发剂的掺量分别为29、23、48 kg时，地聚物具有优异的流变性能（塑性黏度5.47 Pa·s、屈服应力547.21 Pa）和力学性能（7 d抗压强度76.3 MPa、28 d抗压强度93.2 MPa）；在90 d侵蚀周期中，PC出现了明显的石膏型侵蚀破坏现象，抗压强度损失达31.6%，孔隙率增大了43.7%；HPGM内部致密的凝胶结构有效抑制了膨胀性石膏和其他劣化产物的形成，同时水化产物中的C-（A）-S-H凝胶和类水滑石相吸附了部分游离Cl-，使得HPGM在90 d侵蚀周期中未出现明显的侵蚀破坏现象，其抗压强度损失为12.0%，孔隙率增大了16.2%。 Abstract: The simplex centroid design method was used to study the influence of slag-metakaolin-activator ternary system on the rheological and mechanical properties of geopolymer, and the optimal ternary composite ratio was determined. On this basis, the high-performance geopolymer-based coral mortar (HPGM) was prepared, and its durability and degradation mechanism under the erosion of MgSO4 and NaCl composite salt solution were studied, and compared with cement-based coral mortar(PC). The results show that when the dosage of slag, metakaolin, and activator is 29, 23, and 48 kg respectively, the geopolymer has excellent rheological properties (plastic viscosity of 5.47 Pa·s, yield stress of 547.21 Pa) and mechanical properties (7 d compressive strength of 76.3 MPa, 28 d compressive strength of 93.2 MPa). During the 90 d erosion cycle, the PC exhibits significant gypsum type erosion damage, with the compressive strength loss of 31.6% and an increase in porosity of 43.7%. The dense gel structure inside the HPGM effectively inhibits the formation of expansive gypsum and other degraded products, and the C-(A)-S-H gel and hydrotalcite like phase in the hydration products absorb part of free Cl-, which makes the HPGM not appear obvious erosion damage in the 90 d erosion cycle, and its compressive strength loss is 12.0%, and the porosity increases by 16.2%.

陈子禾,何易,王星尧.高性能地聚物基珊瑚砂浆的配合比设计与性能研究[J].混凝土与水泥制品,2024(8):84-90. CHEN Z H,HE Y,WANG X Y.Mix proportion design and performance study of high-performance geopolymer-based coral mortar[J].China Concrete and Cement Products,2024(8):84-90.

摘   要：分别对比研究了水泥掺量（0、2.5%、5.0%、7.5%、10.0%）和氢氧化钙掺量（0、0.25%、0.50%、1.00%、2.00%）对脱硫石膏基自流平砂浆（S砂浆）和磷石膏基自流平砂浆（P砂浆）工作性和力学性能的影响，分析了磷酸盐和二水石膏含量对S砂浆性能的影响机理。结果表明：随着水泥掺量的增加，S、P砂浆的流动度均先增加后趋于平稳，初凝时间基本先延长后缩短，S砂浆的24 h抗压强度先升高后降低，P砂浆的24 h抗压强度先降低后升高；随着氢氧化钙掺量的增加，S、P砂浆的初凝时间均先延长后缩短再趋于平稳，S砂浆的流动度先增加后趋于平稳，P砂浆的流动度先增加后降低，24 h抗压强度变化规律与掺水泥时相同；磷酸盐的掺入降低了S砂浆的流动度降低，但在一定的水泥或氢氧化钙掺量范围内，磷酸盐能提高S砂浆的强度；二水石膏的掺入降低了S砂浆的流动度保持能力和强度。 Abstract: The effects of cement content (0, 2.5%, 5.0%, 7.5%, 10.0%) and calcium hydroxide content (0, 0.25%, 0.50%, 1.00%, 2.00%) on the workability and mechanical properties of desulfurization gypsum-based self-leveling mortar(S-mortar) and phosphogypsum-based self-leveling mortar(P-mortar) were compared and studied. The influence mechanism of phosphate and dihydrate gypsum content on the performance of S-mortar was analyzed. The results show that with the increase of cement content, the fluidity of S-mortar and P-mortar first increases and then tends to stabilize, and the initial setting time is basically extended and then shortened. The 24 h compressive strength of S-mortar first increases and then decreases, while the 24 h compressive strength of P-mortar first decreases and then increases. With the increase of calcium hydroxide content, the initial setting time of S-mortar and P-mortar first extends and then shortens and then tends to stabilize, the fluidity of S-mortar first increases and then tends to stabilize, while the fluidity of P-mortar first increases and then decreases. The 24 h compressive strength change pattern is the same as when adding cement. The addition of phosphate reduces the fluidity of S-mortar, but within a certain range of cement or calcium hydroxide content, phosphate can improve the strength of S-mortar. The addition of dihydrate gypsum reduces the ability to maintain the fluidity and strength of S-mortar.

戴浩,宋旭艳,孔俊俊,等.脱硫石膏基与磷石膏基自流平砂浆的性能差异研究[J].混凝土与水泥制品,2024(8):91-96. DAI H,SONG X Y,KONG J J,et al.Study on performance difference between desulfurization gypsum-based and phosphogypsum-based self-leveling mortars[J].China Concrete and Cement Products,2024(8):91-96.

摘   要：研究了氧化石墨烯（GO）的掺量（0、0.042%、0.063%、0.084%、0.105%）对不同再生粗骨料取代率（0、40%、60%、80%、100%）再生混凝土试件抗压强度的影响，并拟合得到了掺GO再生混凝土的抗压强度与再生粗骨料取代率之间的关系表达式。结果表明：随着GO掺量的增加，试件的抗压强度呈先增大后减小的趋势，且当GO的掺量为0.063%时，试件的抗压强度达到最高；随着再生粗骨料取代率的增加，试件的抗压强度降低；ExpDec3指数函数可较为准确地表达掺GO再生混凝土的抗压强度与再生粗骨料取代率之间的关系。 Abstract: The influence of the content (0, 0.042%, 0.063%, 0.084%, 0.105%) of graphene oxide(GO) on the compressive strength of recycled concrete specimens with different replacement rates(0, 40%, 60%, 80%, 100%) of recycled coarse aggregates was studied, and the relationship expression between the compressive strength of recycled concrete with GO and the replacement rate of recycled coarse aggregate was fitted. The results show that with the increase of the content of GO, the compressive strength of the specimen shows a trend of first increasing and then decreasing, and the compressive strength of the specimen reaches the highest when the content of GO is 0.063%. As the replacement rate of recycled coarse aggregate increases, the compressive strength of the specimens decreases. The ExpDec3 exponential function can accurately express the relationship between the compressive strength of recycled concrete with GO and the replacement rate of recycled coarse aggregate.

曾钰,雷劲松,杨振超.氧化石墨烯对再生混凝土抗压强度的影响[J].混凝土与水泥制品,2024(8):97-100,105. ZENG Y,LEI J S,YANG Z C.Effect of graphene oxide on compressive strength of recycled concrete[J].China Concrete and Cement Products,2024(8):97-100,105.

摘   要：对水滑石进行了煅烧改性，并分析了煅烧温度（500、600、850 ℃）对水滑石微观性能的影响。研究了单Cl-模拟海水体系和Cl-、SO42-共存模拟海水体系下，改性水滑石掺量（0、3%、5%、7%）对砂浆氯离子固化能力、抗压强度的影响，同时进行了机理分析。结果表明：水滑石经过煅烧后会失去CO32-，导致层间位置空缺，最佳煅烧温度为500 ℃；与Cl-、SO42-共存模拟海水体系相比，单Cl-模拟海水体系下的氯离子固化率较大；随着改性水滑石掺量的增加，砂浆的氯离子固化率增大，抗压强度先增大后减小；综合考虑，改性水滑石最佳掺量宜为3%。 Abstract: The modification of hydrotalcite was carried out through calcination, and the influence of calcination temperature (500, 600, 850 ℃) on the microstructure properties of hydrotalcite was analyzed. The effects of modified hydrotalcite content (0, 3%, 5%, 7%) on the chloride ion solidification ability and compressive strength of mortar under single Cl- simulated seawater system and Cl- and SO42- coexisting simulated seawater system were studied, and the mechanism was analyzed. The results show that after calcination, hydrotalcite will lose CO32-, leading to interlayer vacancy, and the optimal calcination temperature is 500 ℃. Compared with the Cl- and SO42- coexisting simulated seawater system, the chloride ion solidification rate is higher in the single Cl- simulated seawater system. With the increase of modified hydrotalcite content, the chloride ion solidification rate of mortar increases, and the compressive strength first increases and then decreases. Taking all factors into consideration, the optimal content of modified hydrotalcite should be 3%.

李永强.改性水滑石对砂浆氯离子固化性能的影响[J].混凝土与水泥制品,2024(8):101-105. LI Y Q.Effect of modified hydrotalcite on solidification properties of chloride ions in mortar[J].China Concrete and Cement Products,2024(8):101-105.

摘   要：通过SEM、XRD、激光粒度分析等测试方法，分析了花岗岩石粉的性能，并研究了花岗岩石粉对水泥水化热的影响及其与减水剂的适应性。结果表明：花岗岩石粉的主要化学成分为SiO2和Al2O3，主要矿物组成为石英、钠长石和微斜长石，无定形物质含量较少，粒径多分布在20～150 μm之间；单掺花岗岩石粉会降低水泥净浆的水化热；复掺适量花岗岩石粉与粉煤灰可促进水泥早期（12 h、1 d）水化；花岗岩石粉与聚羧酸减水剂的适应性良好。 Abstract: The properties of granite powder were analyzed by SEM, XRD, laser particle size analysis and other testing methods, and the effects of granite powder on the heat of hydration of cement and its adaptability to water reducing agent were studied. The results show that the main chemical compositions of granite powder are SiO2 and Al2O3, the main mineral compositions are quartz, sodium feldspar and microplagioclase feldspar, the content of amorphous material is small, and the particle size is mostly distributed in the range of 20~150 μm. Single addition of granite powder reduces the heat of hydration of the cement paste. Mixing appropriate content of granite powder and fly ash can promote the hydration of the cement in the early stage(12 h, 1 d). The adaptability of granite powder and polycarboxylate superplasticizer is good.

王星,韩云婷,周敬山.花岗岩石粉的性能及其与减水剂的适应性研究[J].混凝土与水泥制品,2024(8):106-110. WANG X,HAN Y T,ZHOU J S.Study on the properties of granite powder and its adaptability to water reducing agents[J].China Concrete and Cement Products,2024(8):106-110.

摘   要：分析了生蚝壳（OS）的主要化学成分及其作为胶凝材料或骨料的制备方法，综述了OS粉等质量部分替代水泥或OS砂等质量部分替代天然细骨料对混凝土工作性、力学性能和耐久性能的影响，评价了OS应用到混凝土中的环境效益，可为OS的资源化利用提供参考，同时降低混凝土的生产成本，减少碳排放。 Abstract: The main chemical compositions of oyster shell (OS) and its preparation methods as cementitious material or aggregate were analyzed, and the effects of equal mass partial replacement of cement by OS powder or equal mass partial replacement of natural fine aggregate by OS sand on the workability, mechanical properties, and durability of concrete were reviewed, and the environmental benefits of the application of OS in concrete were evaluated, which can provide a reference for the resource utilization of OS, and reduce concrete production cost and carbon emission.

文安飞,努尔麦麦提·阿卜力米提,张政,等.生蚝壳应用于混凝土中的研究进展[J].混凝土与水泥制品,2024(8):111-115. WEN A F,NUERMAIMAITI A,ZHANG Z,et al.Research progress on application of oyster shells in concrete[J].China Concrete and Cement Products,2024(8):111-115.