在渡口仁和砂子中掺入细砂,能改善砂浆和易性,而掺量太多,砂浆强度又要降低。我们在施工中掺量不一,有15％、20％、25％,究竟多少为好?1973年6月我们初步作了砂浆强度和细砂掺量试验,证明细砂掺量30％最好,不但和易性改善,而且强度增长约30％(以仁和砂砂浆强度为100％), The incorporation of fine sand in the fertile renhe sands can improve the ease of the mortar, while the amount of the sand is too much and the strength of the mortar is reduced. We mixed in the construction of varying amounts, 15%, 20%, 25%, what is better? In June 1973, we initially made a mortar strength and fine sand volume test, proved that fine sand content of 30% is best Not only improves the workability, but also increases the strength by about 30% (with 100% Renhe mortar strength),