全珊瑚海水混凝土的配合比设计和基本性能

发布时间：2018-06-10 06:45

  本文选题：全珊瑚海水混凝土 + 珊瑚　； 参考：《南京航空航天大学》2015年硕士论文

【摘要】：我国南海诸岛分布众多的珊瑚岛礁,采用珊瑚与海水等原料,就地取材,配制珊瑚混凝土具有重要的理论意义和工程应用价值。本文利用珊瑚骨料的破碎、混凝土搅拌等技术手段和富浆混凝土理论,采用正交设计方法进行全珊瑚混凝土的配合比设计和优化,得到了C30、C40、C50和C55的普通水泥全珊瑚海水混凝土以及C25碱式硫酸镁水泥全珊瑚海水混凝土的配合比,并通过试验得到了系列全珊瑚海水混凝土的基本性能。本文主要研究内容和结论如下:1、研究了珊瑚骨料简单破碎工艺,以及珊瑚风化对骨料的影响。结果表明,与风化珊瑚相比,未风化珊瑚骨料表观密度大,筒压强度高;采用简单破碎工艺以后,珊瑚骨料各项指标均优于破碎前的骨料:破碎后珊瑚骨料的筒压强度提高约9.5%,含泥量降低约8%,针片状颗粒含量降低约20%。2、进行了全珊瑚混凝土的配合比设计及优化。结果表明,全珊瑚混凝土立方体强度的配合比因素影响规律大小顺序是:预吸水率净水灰比质量砂率总胶凝材料用量;通过多元回归分析,得到全珊瑚混凝土抗压强度与总水胶比、水泥用量和矿物掺合料之间的三元回归关系,并得到了C30、C40、C50和C55全珊瑚海水混凝土的优化配合比。3、研究了C30、C40、C50和C55全珊瑚海水混凝土的基本力学性能。与普通混凝土和普通轻集料混凝土的对比分析结果表明,全珊瑚海水混凝土的劈裂抗拉强度、抗折强度均大于相同立方体抗压强度等级的普通混凝土和普通轻集料混凝土,而轴心抗压强度则介于普通混凝土和普通轻集料混凝土之间;此外,全珊瑚海水混凝土的静弹性模量略低于普通混凝土,但高于普通轻集料混凝土;全珊瑚混凝土的泊松比为0.25~0.28。4、研究了全珊瑚海水混凝土的基本力学性能之间的相互关系。结果表明,轴心抗压强度和劈拉强度均与立方体抗压强度有较强的线性关系;抗折强度与立方体抗压强度之比范围:0.102~0.103;弹性模量与立方体抗压强度的关系符合普通混凝土的关系公式,但参数值有所变化。5、全珊瑚海水混凝土的应力-应变曲线上升段与普通混凝土的过镇海上升段模型相同,下降段则明显比普通混凝土的下降段要陡,说明全珊瑚混凝土的脆性比普通混凝土高。此外,全珊瑚海水混凝土的应力应变全曲线下降段与普通混凝土相比有所变化,下降段方程:y=x/（-α +（ α+1）x），， 1≤x 。6、碱式硫酸镁水泥全珊瑚海水混凝土的劈裂抗拉强度、抗折强度均大于相同强度等级的普通硅酸盐水泥全珊瑚海水混凝土,其弹性模量和普通硅酸盐水泥全珊瑚海水混凝土比较接近;碱式硫酸镁水泥全珊瑚海水混凝土的应力应变曲线下降段比普通水泥全珊瑚海水混凝土全曲线的下降段缓和,并且可以用过镇海模型来描述,这充分说明了碱式硫酸镁水泥能够降低全珊瑚海水混凝土的脆性,并赋予其一定的韧性。
[Abstract]:There are many coral islands and reefs in the South China Sea. It is of great theoretical significance and engineering value to use coral and sea water as raw materials to prepare coral concrete. In this paper, the orthogonal design method is used to design and optimize the mix ratio of the whole coral concrete by using the technical means such as the crushing of coral aggregate and the mixing of concrete and the theory of rich concrete. The mixture ratio of C30C40C50 and C55 cement whole coral sea water concrete and C25 basic magnesium sulfate cement whole coral sea water concrete were obtained. The basic properties of series of whole coral sea water concrete were obtained by experiments. The main contents and conclusions of this paper are as follows: 1. The simple crushing process of coral aggregate and the effect of coral weathering on aggregate are studied. The results show that, compared with weathered coral, unweathered coral aggregate has high apparent density and high compressive strength. All the indexes of coral aggregate are better than those before crushing. The compressive strength of coral aggregate is increased about 9.5%, the content of mud is reduced about 8%, and the content of needle particle is reduced about 20%. The mix ratio of whole coral concrete is designed and optimized. The results show that the order of the factors affecting the cubic strength of coralline concrete is: preabsorbency, water-cement ratio, total cement content, multivariate regression analysis, The relationship between compressive strength of whole coral concrete and total water-binder ratio, cement content and mineral admixture is obtained. The optimum mix ratio of C30C40C50 and C55 whole coral sea water concrete was obtained. The basic mechanical properties of C30C40C50 and C55 whole coral sea water concrete were studied. The results of comparison with ordinary concrete and ordinary lightweight aggregate concrete show that the splitting tensile strength and flexural strength of the whole coral sea water concrete are higher than those of ordinary concrete and ordinary lightweight aggregate concrete with the same cube compressive strength grade. The axial compressive strength is between ordinary concrete and ordinary lightweight aggregate concrete, in addition, the static elastic modulus of the whole coral sea water concrete is slightly lower than that of ordinary concrete, but higher than that of ordinary lightweight aggregate concrete. The Poisson's ratio of the whole coral concrete is 0.25m 0.28.4. the relationship between the basic mechanical properties of the whole coral sea water concrete is studied. The results show that the axial compressive strength and splitting tensile strength have a strong linear relationship with the cube compressive strength. The ratio of flexural strength to cube compressive strength is in the range of: 0.102 / 0.103. The relation between elastic modulus and cube compressive strength is in accordance with the relation formula of ordinary concrete. But the parameter value of the whole coral sea water concrete is changed. The rising section of the stress-strain curve of the whole coral sea concrete is the same as the model of the ordinary concrete rising section through Zhenhai, and the descending section is obviously steeper than that of the ordinary concrete. It shows that the brittleness of whole coral concrete is higher than that of ordinary concrete. In addition, the whole stress-strain curve of the whole coral sea water concrete is different from that of the ordinary concrete. The equation of the descending section is: (1) x / r 伪 (1 鈮

本文编号：2002334