硬化水泥浆体结构和性能与熟料矿物匹配水化的关系
发布时间：2019-03-16 16:44
【摘要】：水泥基材料是目前用量最大、用途最广的土木工程材料，对国民经济的发展起着重要的作用，但是水泥基复合材料也存在其本身缺陷。比如其韧性差、抗折强度低；在恶劣环境下容易受各种离子的侵入腐蚀，使结构遭到破坏等。虽然这些年许多学者采取各种措施来解决上述问题，比如掺加各种外加剂、矿物细掺料研制高性能混凝土，在一定程度上改善了混凝土的强度和耐久性，但是水泥基材料破坏的根本原因还是在于其结构的致密性低、均匀性差。因此，需要从材料的结构和构造入手，进一步提高水泥基材料的性能，对水泥熟料矿物之间的匹配水化的机理进行研究，控制形成匀质浆体结构的各种因素，生产出结构致密、均匀、耐久性好、使用寿命高的优质混凝土。 本文从熟料矿物组成，晶种诱导水泥水化以及熟料的颗粒组成三方面对熟料矿物匹配水化进行了研究，通过控制水泥熟料各矿物相之间的匹配水化，达到控制水化产物形成的速率、形态与尺寸、颗粒分布与堆积情况等，最终控制水泥基材料硬化浆体形成均匀和致密的结构。主要的研究成果及结论如下： 1.矿物组成对熟料匹配水化及硬化浆体结构和性能的影响 （1）硬化浆体的1d抗压强度总体上与C3A含量相关性较好，但是，当KH=0.87时，与(C3S+C3A)/C4AF比值的相关性更好，相关系数为0.9996。28d强度与C3S含量相关性较好，相关系数为0.9251，但是，当KH=0.87时，与(C3S+C3A)/C4AF的比值相关性更好，相关系数为0.9684，而当KH=0.93时，28d强度与C3S/C2S的比值相关性较好，相关系数为0.9989。90d的强度在KH=0.87时与(C3S+C2S)/C4AF的比值相关性较好，相关系数为0.9998。 （2）熟料中C3A的含量是影响1h内水泥水化放热速率的主要因素，当C3A含量相差不大时，C3S的含量对水泥试样的水化放热速率有重要影响；C3S含量对水泥试样30h后的水化速率其重要作用。 （3）当熟料四种主要的矿物含量分别为C3S58.6%，C2S17.9%，C3A9.6%，C4AF11.3%时，各熟料间匹配水化好，硬化水泥浆体的平均孔径为9.35μm，最可几孔径为3.15μm，孔隙率为5.29%，90d抗压强度达到135.1MPa，最终形成致密均匀的硬化浆体结构。 2.晶种诱导对硬化浆体结构与性能的影响 （1）掺加晶种可以提高普通硅酸盐水泥的水化放热速率，，对水泥有促凝作用；当掺加晶种的水灰比为0.28，养护56d时，对水泥浆体性能的优化效果最好。 （2）掺加晶种优化浆体结构，进而提高试样的抗压、抗折强度，并能确定晶种的最佳掺量为4%。在最佳掺量下，56d龄期的晶种比28d龄期晶种对水泥强度的影响效果更好，能使水泥的3d抗压、抗折强度分别提高13.63%、45.26%，7d抗压、抗折强度分别提高10.29%、17.23%，28d抗压、抗折强度分别提高13.83%、23.03%。 3.熟料颗粒组成对硬化浆体和结构与性能的影响 合理控制水泥熟料的颗粒组成，使各粒径范围内熟料水化速率匹配，水化产物合理的交织连接在一起，进而可使硬化水泥浆体得到最高的强度与最优的结构。本文中熟料粒径0.4-6μm占28.61%，6-20μm占42.8%，20-40μm占26.2%时熟料矿物匹配水化的较好，硬化浆体强度最高为99.4MPa，其平均孔径为11.9μm，最可几孔径为3.5μm，孔隙率为4.3%。
[Abstract]:The cement-based material is the most widely used civil engineering material, and plays an important role in the development of the national economy, but the cement-based composite also has its own defects. Such as poor toughness and low bending strength, and is easy to be corroded by various ions in a severe environment, so that the structure is damaged and the like. Although many scholars in these years have taken various measures to solve the above problems, such as adding various kinds of additives and mineral fine materials to develop high-performance concrete, the strength and the durability of the concrete are improved to a certain extent, However, the root cause of the failure of the cement-based material is that the structure of the cement-based material is low in density and poor in uniformity. Therefore, the structure and the structure of the material need to be started, the performance of the cement-based material is further improved, the mechanism of the matching and hydration between the cement clinker minerals is researched, various factors forming the homogeneous slurry structure are controlled, the structure is compact, uniform, and the durability is good, High-quality concrete with high service life. In this paper, the hydration of the clinker minerals is studied from the three aspects of the clinker mineral composition, the seed crystal-induced cement hydration and the particle composition of the clinker, and the rate, the shape and the rule of the formation of the hydration products are achieved by controlling the matching hydration between the mineral phases of the cement clinker. Inch, particle distribution and accumulation, etc., and finally control the cement-based material to harden the slurry to form a uniform and dense junction. The main research results and conclusions are as follows: in that follow:1. the structure and the property of the mineral composition to the hydration of the clinker and the structure and properties of the hardened slurry The effect of (1) the 1 d compressive strength of the hardened slurry is generally associated with the C3A content, but when KH = 0.87, the ratio to (C3S + C3A)/ C4AF The correlation coefficient was 0.9996.28 d. The correlation coefficient was 0.9251. However, when KH = 0.87, the correlation was better with (C3S + C3A)/ C4AF, the correlation coefficient was 0.9684, and when KH = 0.93, the ratio of 28d strength to C3S/ C2S The correlation was good. The correlation coefficient was 0.9989.90d. The correlation coefficient was 0.87 and the correlation coefficient was 0. .9998. (2) The content of C3A in the clinker is the main factor that affects the hydration heat release rate of the cement in one hour. When the content of C3A is not large, the content of C3S has an important influence on the hydration heat release rate of the cement sample, and the content of the C3S is 30 h after the cement sample. The main mineral content of the clinker is C3S58.6%, C2117.9%, C3A9.6%, C4AF11.3%, the matching of the clinker is good, the average pore diameter of the hardened cement slurry is 9.35. m u.m, the most probable pore size is 3.15. m u.m, the porosity is 5.29%, and the compressive strength of 90d is up to to 135.1 MPa, resulting in a dense formation uniform hardening slurry structure.2. seed-induced alignment the effect of the structure and the performance of the hardened slurry (1) is that the seed crystal can improve the hydration heat release rate of the ordinary portland cement, The optimum effect of the properties of the cement paste is as follows: (2) the seed crystal is doped to optimize the structure of the slurry, so that the compressive strength and the breaking strength of the sample are improved. And the optimal content of the seed crystal is 4%. Under the optimum mixing amount, the effect of the seed crystal at the age of 56d on the strength of the cement is better than that of the seed crystal at the age of 28d, the 3d compression resistance and the bending strength of the cement can be increased by 13.63%, 45.26% and 7d respectively, and the bending strength is increased by 10.29%, 17.23% and 28d respectively. and the bending strength Increase of 13.83%, 23.03%.3. Clinker the effect of the particle composition on the hardened slurry and the structure and the performance is reasonable to control the particle composition of the cement clinker, the rate matching and the reasonable interweaving of the hydration products are connected together, The maximum strength and optimum structure of the hardened cement paste are obtained. The particle size of the clinker in this paper is 28.61%, 42.8% in 6-20. m u.m,20-40. m. m is 26.2%, the strength of the hardened slurry is 99.4 MPa, and the average pore diameter is 11.9. m
【学位授予单位】：济南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TQ172.1
本文编号：2441758
[Abstract]:The cement-based material is the most widely used civil engineering material, and plays an important role in the development of the national economy, but the cement-based composite also has its own defects. Such as poor toughness and low bending strength, and is easy to be corroded by various ions in a severe environment, so that the structure is damaged and the like. Although many scholars in these years have taken various measures to solve the above problems, such as adding various kinds of additives and mineral fine materials to develop high-performance concrete, the strength and the durability of the concrete are improved to a certain extent, However, the root cause of the failure of the cement-based material is that the structure of the cement-based material is low in density and poor in uniformity. Therefore, the structure and the structure of the material need to be started, the performance of the cement-based material is further improved, the mechanism of the matching and hydration between the cement clinker minerals is researched, various factors forming the homogeneous slurry structure are controlled, the structure is compact, uniform, and the durability is good, High-quality concrete with high service life. In this paper, the hydration of the clinker minerals is studied from the three aspects of the clinker mineral composition, the seed crystal-induced cement hydration and the particle composition of the clinker, and the rate, the shape and the rule of the formation of the hydration products are achieved by controlling the matching hydration between the mineral phases of the cement clinker. Inch, particle distribution and accumulation, etc., and finally control the cement-based material to harden the slurry to form a uniform and dense junction. The main research results and conclusions are as follows: in that follow:1. the structure and the property of the mineral composition to the hydration of the clinker and the structure and properties of the hardened slurry The effect of (1) the 1 d compressive strength of the hardened slurry is generally associated with the C3A content, but when KH = 0.87, the ratio to (C3S + C3A)/ C4AF The correlation coefficient was 0.9996.28 d. The correlation coefficient was 0.9251. However, when KH = 0.87, the correlation was better with (C3S + C3A)/ C4AF, the correlation coefficient was 0.9684, and when KH = 0.93, the ratio of 28d strength to C3S/ C2S The correlation was good. The correlation coefficient was 0.9989.90d. The correlation coefficient was 0.87 and the correlation coefficient was 0. .9998. (2) The content of C3A in the clinker is the main factor that affects the hydration heat release rate of the cement in one hour. When the content of C3A is not large, the content of C3S has an important influence on the hydration heat release rate of the cement sample, and the content of the C3S is 30 h after the cement sample. The main mineral content of the clinker is C3S58.6%, C2117.9%, C3A9.6%, C4AF11.3%, the matching of the clinker is good, the average pore diameter of the hardened cement slurry is 9.35. m u.m, the most probable pore size is 3.15. m u.m, the porosity is 5.29%, and the compressive strength of 90d is up to to 135.1 MPa, resulting in a dense formation uniform hardening slurry structure.2. seed-induced alignment the effect of the structure and the performance of the hardened slurry (1) is that the seed crystal can improve the hydration heat release rate of the ordinary portland cement, The optimum effect of the properties of the cement paste is as follows: (2) the seed crystal is doped to optimize the structure of the slurry, so that the compressive strength and the breaking strength of the sample are improved. And the optimal content of the seed crystal is 4%. Under the optimum mixing amount, the effect of the seed crystal at the age of 56d on the strength of the cement is better than that of the seed crystal at the age of 28d, the 3d compression resistance and the bending strength of the cement can be increased by 13.63%, 45.26% and 7d respectively, and the bending strength is increased by 10.29%, 17.23% and 28d respectively. and the bending strength Increase of 13.83%, 23.03%.3. Clinker the effect of the particle composition on the hardened slurry and the structure and the performance is reasonable to control the particle composition of the cement clinker, the rate matching and the reasonable interweaving of the hydration products are connected together, The maximum strength and optimum structure of the hardened cement paste are obtained. The particle size of the clinker in this paper is 28.61%, 42.8% in 6-20. m u.m,20-40. m. m is 26.2%, the strength of the hardened slurry is 99.4 MPa, and the average pore diameter is 11.9. m
【学位授予单位】：济南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TQ172.1
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