第八期_2022_《混凝土与水泥制品》杂志社

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发布时间：2020-01-06 00:00:00

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第八期

盾构隧道回填用自流平泡沫混凝土试验研究

李春宝1，李笑天1，李申2，管笛2，肖畅1，秦鹏举3，丛子钦1，张建华4

2022年第8期

摘要

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摘要：通过正交试验研究了水灰比、HTFC掺合料、减水剂、发泡剂对泡沫混凝土性能的影响，改进了用于输送、生产和浇筑的施工设备。结果表明，各因素对泡沫混凝土流动度的影响顺序大小为：发泡剂掺量＞水灰比>减水剂掺量>HTFC掺合料掺量。满足实际施工要求的自流平泡沫混凝土的配合比为：水灰比0.5~0.6、HTFC掺合料掺量35%~40%、减水剂掺量1.00%、发泡剂掺量3.0%~3.5%。 Abstract: The effects of water-cement ratio, HTFC admixtures, water reducing agent and foaming agent on the properties of foamed concrete were studied through orthogonal test, and the construction equipments for transportation, production and pouring were improved. The results show that the influence order of various factors on the fluidity of foamed concrete is as follows: foaming agent content > water-cement ratio > water reducing agent content > HTFC admixture content. The mix proportion of self-leveling foamed concrete meeting the actual construction requirements is that the water-cement ratio is 0.5~0.6, the HTFC admixture content is 35%~40%, the water reducing agent content is 1.00%, and the foaming agent content is 3.0%~3.5%.

李春宝,李笑天,李申,等.盾构隧道回填用自流平泡沫混凝土试验研究[J].混凝土与水泥制品,2022(8):83-86. LI C B,LI X T,LI S,et al.Experimental Study on Self-leveling Foamed Concrete For Shield Tunne Backfill[J].China Concrete and Cement Products,2022(8):83-86.

高性能复合矿物掺合料的制备及胶砂性能研究

李仕彬1，王文涛1，黄从运2，马继汉2

2022年第8期

摘要

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摘要：分析了矿渣、钢渣、建筑垃圾和循环灰的活性，研究了活化剂的类型（M型、N型、P型、Q型）和掺量对掺矿物合料胶砂性能的影响，通过SEM和XRD分析了活化剂的作用机理。结果表明：4种矿物掺合料中，矿渣的活性指数最大，而循环灰的活性指数最小；不同类型的活化剂均能有效提高掺复合矿物掺合料胶砂的强度，其中，P型活化剂的提高效果最好，其适宜掺量为2.5%；活化剂的掺入促进了AFt和C-S-H凝胶的生成，从而提升了强度。 Abstract: The activity of slag, steel slag, construction waste and circulating ash were analyzed. The effects of the type (M-type, N-type, P-type, Q-type) and content of activator on the properties of mortar mixed with composite mineral admixtures were studied. The action mechanism of activators was analyzed by SEM and XRD. The results show that among the four mineral admixtures, the activity index of slag is the largest, while that of circulating ash is the smallest. Different types of activators can effectively improve the strength of mortar mixed with composite mineral admixtures. Among them, the P-type activator has the best effect, and its appropriate content is 2.5%. The activator promotes the formation of AFt and C-S-H gel, thus enhancing the strength.

李仕彬,王文涛,黄从运,等.高性能复合矿物掺合料的制备及胶砂性能研究[J].混凝土与水泥制品,2022(8):87-90,95. LI S B,WANG W T,HUANG C Y,et al.Study on Preparation of High Performance Composite Mineral Admixtures and Properties of Mortar[J].China Concrete and Cement Products,2022(8):87-90,95.

玻璃粉-粉煤灰基地聚合物混凝土力学及微观性能研究

陈剑刚1，潘泽滨2，马云龙1，舒本安1，成浩1，杨腾宇1

2022年第8期

摘要

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摘要：研究了玻璃粉的粒径和取代率、复合碱激发剂的模数和浓度对玻璃粉-粉煤灰基地聚合物混凝土（GAGC）力学性能和微观结构的影响。结果表明：随着玻璃粉取代率的增加，GAGC的抗压强度呈先增大后减小的趋势，最佳取代率为40%；随着玻璃粉粒径的增大，GAGC体系中的凝胶体和团簇结构减少，微观结构由密实转为松散，力学性能降低，最优粒径为（10±2）μm；随着复合碱激发剂模数和浓度的增大，GAGC的抗压强度呈先增大后减小的趋势，最佳模数和浓度分别为1.5和1.4 mol/kg。 Abstract: The effects of particle size and substitution rate of glass powder, modulus and concentration of composite alkali activator on the mechanical properties and microstructure of glass powder and fly ash based geopolymer concrete (GAGC) were studied. The results show that the compressive strength of GAGC increases first and then decreases with the increase of glass powder substitution rate, and the optimal substitution rate is 40%. With the increase of glass powder particle size, the gel and cluster structures in GAGC system decrease, the microstructure changes from dense to loose, and the mechanical properties decrease, and the optimal particle size is(10±2)μm. With the increase of the modulus and concentration of composite alkali activator, the compressive strength of GAGC increases first and then decreases, and the optimal modulus and concentration are 1.5 and 1.4 mol/kg respectively.

陈剑刚,潘泽滨,马云龙,等.玻璃粉-粉煤灰基地聚合物混凝土力学及微观性能研究[J].混凝土与水泥制品,2022(8):91-95. CHEN J G,PAN Z B,MA Y L,et al.Study on Mechanical and Microscopic Properties of Glass Powder and Fly Ash Based Geopolymer Concrete[J].China Concrete and Cement Products,2022(8):91-95.

机制砂混凝土抗压强度分析及预测

陶松涛1,2，延永东1，郑玉龙1，刘甲琪1，梁晓封1，王鑫1

2022年第8期

摘要

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摘要：为了探究机制砂混凝土的抗压强度变化规律，进行了不同机制砂替代率（0、30%、50%、70%）、粉煤灰掺量（0、20%、30%、40%）和机制砂石粉含量（0、5.8%、11.6%）混凝土试件的抗压强度试验，并结合试验数据建立了BP神经网络模型预测抗压强度。结果表明：随着机制砂替代率的增加，试件的7 d、28 d抗压强度呈先增大后减小的趋势，且在机制砂替代率为50%时达到最大，机制砂替代率对试件的60 d抗压强度影响较小；掺入粉煤灰使试件的早期抗压强度降低，但30%掺量的粉煤灰有利于提高试件的60 d抗压强度；随着机制砂石粉含量的增加，试件的7 d抗压强度先增大后减小，28 d、60 d抗压强度则逐渐增大；建立的机制砂混凝土28 d抗压强度预测模型的精度较高。 Abstract： In order to explore the change law of the compressive strength of manufactured sand concrete, the compressive strength tests of concrete specimens with different manufactured sand replacement rates(0, 30%, 50%, 70%), fly ash contents(0, 20%, 30%, 40%) and stone powder contents(0, 5.8%, 11.6%) in manufactured sand were carried out. Combined with the test datas, the BP neural network model was established to predict the compressive strength. The results show that the 7 d and 28 d compressive strength of the specimen increase first and then decrease with the increase of manufactured sand replacement rate, and reaches the maximum when the manufactured sand replacement rate is 50%. The manufactured sand replacement rate has little effect on the 60 d compressive strength of the specimen. Adding fly ash reduces the early compressive strength of the specimen, but 30% fly ash is beneficial to improve the 60 d compressive strength of the specimen. With the increase of stone powder content in manufactured sand, the 7 d compressive strength of the specimen first increases and then decreases, and the 28 d and 60 d compressive strength increase gradually. The established model for predicting the 28 d compressive strength of manufactured sand concrete has high accuracy.

陶松涛,延永东,郑玉龙,等.机制砂混凝土抗压强度分析及预测[J].混凝土与水泥制品,2022(8):96-100,104. TAO S T,YAN Y D,ZHENG Y L,et al.Analysis and Prediction of Compressive Strength of Manufactured Sand Concrete[J].China Concrete and Cement Products,2022(8):96-100,104.

农业废弃物在混凝土中的资源化利用研究进展

张思雨1，屈晓明2，李长江1，于琦1，许冬1，罗金垒3

2022年第8期

摘要

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摘要：介绍了农业废弃物在资源化利用过程中存在的问题及在混凝土中的应用研究现状，并提出了相应的改善措施，可为拓宽农业废弃物的资源化利用途径提供参考，并推进我国乡村生态振兴建设和碳中和进程。 Abstract: The problems existing in the process of resource utilization of agricultural waste and the research status of its application in concrete are introduced, and the corresponding improvement measures are put forward, which can provide a reference for broadening the resource utilization of agricultural waste, and further promote the process of rural ecological revitalization and carbon neutrality in China.

张思雨,屈晓明,李长江,等.农业废弃物在混凝土中的资源化利用研究进展[J].混凝土与水泥制品,2022(8):101-104. ZHANG S Y,QU X M,LI C J,et al.Research Progress on Resource Utilization of Agricultural Waste in Concrete[J].China Concrete and Cement Products,2022(8):101-104.

表面硬度法检测灌浆料实体强度试验研究

赵建华1，凌良建2，吕嘉2，谢慧晟2

2022年第8期

摘要

引用本文

摘要：研究了灌浆料标准试块抗压强度随龄期的变化规律，分析了表面硬度法检测灌浆料实体抗压强度的影响因素，建立了工程现场灌浆料表面硬度与抗压强度之间的测强曲线，并通过分析工程现场构件注浆孔端与出浆孔端灌浆料的表面硬度差异确定了合适的检测部位。结果表明：灌浆料抗压强度在前期增长较快，14 d后增长变缓，且14 d抗压强度能够达到28 d抗压强度的90%左右，故建议表面硬度法检测灌浆料实体抗压强度的最佳龄期应在14 d之后；出浆孔端灌浆料的表面硬度与抗压强度之间的相关性较差，而注浆孔端灌浆料的表面硬度与抗压强度之间的相关性较好，故建议表面硬度法检测灌浆料实体抗压强度的检测部位应选择注浆孔端；根据注浆孔端灌浆料的表面硬度与标准试块表面硬度之间的差异确定了二者之间的表面硬度修正量，可为表面硬度法检测灌浆料实体抗压强度的实际应用提供参考。 Abstract: The variation law of the compressive strength of the grouting material standard test block with age was studied, the influencing factors of testing the compressive strength of grouting material by surface hardness method were analyzed, and the strength-measurement curve between the surface hardness and compressive strength of grouting material in the project site was established, and the appropriate testing position was determined by analyzing the surface hardness difference between the grouting hole and the outlet hole of the components in the project site. The results show that the compressive strength of grouting material increases rapidly in the early stage, and slows down after 14 d, and the 14 d compressive strength can reach about 90% of the 28 d compressive strength. Therefore, it is suggested that the best age for testing the solid compressive strength of grouting materials by surface hardness method should be after 14 d. The correlation between the surface hardness at the location of the outlet hole and the compressive strength of the grouting material is poor, while the correlation between the surface hardness at the location of the grouting hole and the compressive strength of the grouting material is good. Therefore, it is suggested that the grouting hole should be selected as the detection position for testing the compressive strength of grouting material by surface hardness method. According to the difference between the surface hardness of the grouting hole position and the surface hardness of the grouting material standard test block, the surface hardness correction between the two is determined, which can provide a reference for the practical application of the surface hardness method to detect the compressive strength of the grouting material.

赵建华,凌良建,吕嘉,等.表面硬度法检测灌浆料实体强度试验研究[J].混凝土与水泥制品,2022(8):78-82. ZHAO J H,LING L J,LYU Jia,et al.Experimental Study on Testing Solid Strength of Grouting Materials by Surface Hardness Method[J].China Concrete and Cement Products,2022(8):78-82.

BIM技术在装配整体式结构正向设计中的应用研究

刘爽1，龚鑘1，2,周理1.2

2022年第8期

摘要

引用本文

摘要：以某大学装配式框架结构宿舍项目为例，分析了BIM技术应用于装配式建筑正向设计的流程，研究了预制构件拆分、构件节点钢筋碰撞避让等问题，可为装配整体式结构的设计、生产及施工提供参考。 Abstract：Taking the prefabricated frame structure dormitory project of a university as an example, the process of applying BIM technology to the forward design of prefabricated buildings is analyzed, and the problems such as the separation of prefabricated components and collision avoidance of reinforcement at component nodes were studied, which can provide a reference for the design, production and construction of assembled integral structures.

刘爽,龚鑘,周理.BIM技术在装配整体式结构正向设计中的应用研究[J].混凝土与水泥制品,2022(8):64-69. LIU S,GONG L,ZHOU L.Study on the Application of BIM Technology in Forward Design of Assembled Integral Structure[J].China Concrete and Cement Products,2022(8):64-69.

泡沫混凝土复合保温墙板研究

项泽强1，李晓宁1，赵敦1，颜小波1，梁泽锋2，孟志武1

2022年第8期

摘要

引用本文

摘要：以普通硅酸盐水泥、粉煤灰、硫铝酸盐水泥、石膏为胶凝材料，掺入减水剂、保水剂、纤维、发泡剂等制备了泡沫混凝土，通过分析发泡剂稳泡时间、泡沫混凝土的凝结时间、抗压强度和膨胀率确定了最优配合比，并对最优配合比下的墙板进行了中试试验。结果表明：发泡剂的最佳稳泡时间为1 h以内；当m普通硅酸盐水泥∶m粉煤灰∶m硫铝酸盐水泥∶m石膏=5.0∶4.0∶0.4∶0.6时，泡沫混凝土的初凝时间小于60 min，抗压强度＞3.5 MPa，膨胀率达到镁基水泥水平，抗开裂性能良好，且此配合比下的墙板各项性能指标良好。 Abstract: Foamed concrete was prepared by using ordinary portland cement, fly ash, sulfoaluminate cement and gypsum as cementing materials, adding water reducing agent, water retaining agent, fiber and foaming agent. The optimal mix proportion was determined by analyzing the foam stabilization time of the foaming agent and the setting time, the compressive strength and the expansion rate of foamed concrete, and the pilot test was carried out for the wallboard under the optimal mix proportion. The results show that the optimum foam stabilization time of the foaming agent is within 1 h. When mordinary portland cement ∶ mfly ash ∶ msulphoaluminate cement ∶ mgypsum is 5.0∶4.0∶0.4∶0.6, the initial setting time of foamed concrete is less than 60 min, the compressive strength is more than 3.5 MPa, the expansion rate reaches the level of magnesium based cement, the cracking resistance is good, and all performance indexes of wallboard under this mix proportion are good.

项泽强,李晓宁,赵敦,等.泡沫混凝土复合保温墙板研究[J].混凝土与水泥制品,2022(8):70-73,82. XIANG Z Q,LI X N,ZHAO D,et al.Study on Foamed Concrete Composite Insulation Wallboards[J].China Concrete and Cement Products,2022(8):70-73,82.

后浇自密实混凝土拼接叠合梁抗弯性能试验研究

薛建英，曹小飞

2022年第8期

摘要

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摘要：设计制作了5根后浇自密实混凝土拼接叠合梁，预制部分用C30普通混凝土，后浇部分用C30自密实混凝土；同时设计了1根用C30普通混凝土浇筑的整浇梁作为对照梁。通过抗弯性能试验，得到了试验梁的跨中挠度、裂缝发展规律和破坏特征。结果表明：拼接叠合梁的受弯破坏形态与对照梁类似，均为适筋破坏；增大拼接叠合面的粗糙度可以提高拼接叠合梁的抗弯承载力，但抗弯承载力与粗糙度不成正相关关系，这与预制部分混凝土中的粗骨料粒径和级配有关；采用箍筋加密和拼接叠合面插筋的方式均可以保证拼接叠合梁的抗弯承载力。 Abstract: Five post-cast self-compacting concrete spliced composite beams were designed, the precast part was poured with C30 ordinary concrete, and the post-cast part was poured with C30 self-compacting concrete. In addition, one cast-in-place beam poured with C30 ordinary concrete was designed as the control beam. Through the flexural performance test, the mid-span deflection, crack development law and failure characteristics of test beams were obtained. The results show that the flexural failure form of the spliced composite beam is similar to that of the control beam, both of which are the appropriate reinforcement failure. Increasing the roughness of the spliced composite surface can improve the flexural capacity of the spliced composite beam, but the flexural capacity is not positively related to the roughness, which is related to the particle size and gradation of coarse aggregate in the precast concrete. Both stirrup encryption and spliced reinforcement can improve the flexural capacity of the spliced composite beam.

薛建英,曹小飞.后浇自密实混凝土拼接叠合梁抗弯性能试验研究[J].混凝土与水泥制品,2022(8):74-77,86. XUE J Y,CAO X F.Experimental Study on Flexural Performance of Post-cast Self-compacting Concrete Spliced Composite Beams[J].China Concrete and Cement Products,2022(8):74-77,86.

混杂纤维UHPC力学性能试验研究

李福海1，李继芸1，唐慧琪1，穆勃江1，姜怡林1，冯立2

2022年第8期

摘要

引用本文

摘要：研究了水胶比、砂胶比、钢纤维掺量、合成粗纤维掺量以及混掺钢纤维和合成粗纤维对超高性能混凝土（UHPC）力学性能的影响。结果表明：水胶比越小、砂胶比越大，UHPC的抗折、抗压强度越高；单掺钢纤维时，UHPC的抗折、抗压强度随钢纤维掺量的增加总体呈增大趋势，钢纤维的最佳掺量为2.0%；单掺合成粗纤维时，UHPC的抗折、抗压强度随合成粗纤维掺量的增加总体呈先增大后减小的趋势，合成粗纤维的最佳掺量为2.0%；混掺钢纤维和合成粗纤维且钢纤维掺量≤2.0%时，合成粗纤维掺量宜≤1.0%。 Abstract: The effects of water-binder ratio, sand-binder ratio, steel fiber content, synthetic coarse fiber content, and blend of steel fiber and synthetic coarse fiber on the mechanical properties of ultra-high performance concrete(UHPC) were studied. The results show that the smaller the water-binder ratio and the larger the sand-binder ratio, the higher the flexural and compressive strength of UHPC. When the steel fiber is mixed alone, the flexural and compressive strength of UHPC generally increase with the increase of the steel fiber content, and the optimal steel fiber content is 2.0%. When the synthetic coarse fiber is mixed alone, the flexural and compressive strength of UHPC generally increase first and then decrease with the increase of the synthetic coarse fiber content, and the optimal synthetic coarse fiber content is 2.0%. When mixing steel fiber and synthetic coarse fiber and the content of steel fiber is ≤2.0%, the content of synthetic coarse fiber should be ≤1.0%.

李福海,李继芸,唐慧琪,等.混杂纤维UHPC力学性能试验研究[J].混凝土与水泥制品,2022(8):56-59. LI F H,LI J Y,TANG H Q,et al.Experimental Study on Mechanical Properties of Hybrid Fiber UHPC[J].China Concrete and Cement Products,2022(8):56-59.

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