Mineral admixtures are used in ordinary and self-compacting mortar to reduce carbon dioxide emission and enhance the performance of mortar at the fresh and hardened states. This paper reports the effect of the content and the fineness of natural pozzolana (NP) on rheological, compressive strength, total and autogenous shrinkage properties of self-compacting mortar. Capillary water absorption of self-compacting mortar was also investigated. Natural pozzolana was used as a partial cement replacement with two levels (15%wt. And 30%wt.) and ground to three specific surface Blaine (SSB) fineness measurements 350 m²/kg, 420 m²/kg and 500 m²/kg. Cement content, water to-binder ratio and superplasticizer content were kept constant for all self-compacting concrete mixtures. Rheological tests were conducted by measuring slump flow and V-funnel flow tests as well as using a rheometer to measure plastic viscosity and yield stress. Compressive strengths of self-compacting concretes were determined at 1, 7, 28, 56, 90 and 180 days of curing. Total and autogenous shrinkage were measured during three months and capillary water absorption of self-compacting mortar was also investigated after 90 days of water curing. The results indicated that the increase of replacement level of natural pozzolana affects negatively the rheological properties of self-compacting mortar. The same tendency is observed as the specific surface Blaine fineness increased. However, in the long-term (beyond 28 days of curing), the compressive strength of NP mixes exceeds that of control mortar. The increase of the fineness of natural pozzolana enhances compressive strength at later age but increases both the total and autogenous shrinkage compared with control mortar. It was observed that increasing the percentage of natural pozzolana generates an increase in water capillary absorption. However, increasing the fineness of natural pozzolana results in slightly lower water absorption of mortar.

矿物外加剂用于普通砂浆和自密实砂浆中，以减少二氧化碳排放并提高砂浆在新鲜和硬化状态下的性能。本文报告了天然火山灰 (NP) 的含量和细度对自密实砂浆的流变、抗压强度、总收缩和自收缩特性的影响。还研究了自密实砂浆的毛细管吸水率。天然火山灰被用作具有两个级别（15%wt. 和 30%wt.）的部分水泥替代品，并研磨到三个比表面布莱恩 (SSB) 细度测量值 350 m ² /kg、420 ​​m ² /kg 和 500 m ²/公斤。所有自密实混凝土混合物的水泥含量、水胶比和减水剂含量保持恒定。通过测量坍落度流动和 V 型漏斗流动试验以及使用流变仪测量塑性粘度和屈服应力来进行流变试验。自密实混凝土的抗压强度在固化 1、7、28、56、90 和 180 天时测定。在三个月内测量了总收缩率和自收缩率，并在水固化 90 天后研究了自密实砂浆的毛细管吸水率。结果表明，天然火山灰替代水平的增加对自密实砂浆的流变性能产生负面影响。随着比表面布莱恩细度的增加，观察到相同的趋势。然而，从长期来看（超过 28 天固化），NP 混合料的抗压强度超过对照砂浆的抗压强度。与对照砂浆相比，天然火山灰细度的增加提高了后期的抗压强度，但增加了总收缩率和自收缩率。据观察，增加天然火山灰的百分比会导致水毛细管吸收增加。然而，增加天然火山灰的细度会导致砂浆的吸水率略低。据观察，增加天然火山灰的百分比会导致水毛细管吸收增加。然而，增加天然火山灰的细度会导致砂浆的吸水率略低。据观察，增加天然火山灰的百分比会导致水毛细管吸收增加。然而，增加天然火山灰的细度会导致砂浆的吸水率略低。