仪器用于灌浆用膨胀砂浆的竖向膨胀率的测定。根据国标GB 50119-2013 《混凝土外加剂应用设计规范》 本规范适用于普通减水剂、高效减水剂、引气剂、引气减水剂、缓凝剂、缓凝减水剂、缓凝高效减水剂、早强剂、早强减水剂、防冻剂、膨胀剂、泵送剂、防水剂及速凝剂等十四种外加剂在混凝土工程中的应用。
灌浆用膨胀砂浆竖向膨胀率测定仪是根据国标GB 50119-2013 《混凝土外加剂应用设计规范》 本规范适用于普通减水剂、高效减水剂、引气剂、引气减水剂、缓凝剂、缓凝减水剂、缓凝高效减水剂、早强剂、早强减水剂、防冻剂、膨胀剂、泵送剂、防水剂及速凝剂等十四种外加剂在混凝土工程中的应用, 本试验方法适用于灌浆用膨胀砂浆的竖向膨胀率的测定。
Expansion mortar vertical expansion rate tester for grouting is based on the national standard GB 50119-2013 "Specifications for the Design and Application of Concrete Admixtures." Fourteen admixtures such as coagulant, retarder water reducer, retarder high efficiency water reducer, early strength agent, early strength water reducer, antifreeze, expansion agent, pumping agent, waterproofing agent and quick setting agent are used in concrete In engineering applications, this test method is applicable to the determination of the vertical expansion rate of expansion mortar for grouting.
Expansion mortar vertical expansion rate measuring instrument for grouting is a technical parameter:
■ Test instruments and tools should meet the following requirements:
Dial indicator: range 0-10mm; accuracy: 0.001mm;
■ Glass plate: length 140mm × width 80mm × thickness 5mm;
■ Steel briquettes: diameter: 70mm, thickness 5mm, mass: 150g;
■ Test mold: 10mm × 10mm × 10mm cube test mold, the assembly seam should be filled with butter and must not leak;
■ Dimensions: 430X430X550mm
■ Weight: 9kg
Installation of vertical expansion rate measuring instrument for grouting expansion mortar
■ The backing plate of the measurement bracket and the beam of the measurement bracket should be fastened with nuts, and its level should not exceed 0.02; the measurement bracket should be placed horizontally on the workbench, and the level should not exceed 0.02;
■ The test mold should be placed on the steel backing plate, and A should be shaken;
■ The glass plate should be placed flat in the middle of the test mold, leaving a 10mm gap between the left and right sides and the inner side of the test mold;
■ Steel briquettes should be placed in glass plates;
■ The dial indicator and measurement bracket should be fixed firmly, but the meter rod should be able to rise and fall freely. When installing the dial indicator, press the bottom of the dial, and the pointer should be pointed to 1/2 of the measuring range.
■灌浆料加水搅拌均匀后应立刻灌模，从玻璃板的一侧灌入。当灌到50mm左右高度时，用捣板在试模的每一侧插捣6 次，中间部位也插捣6 次。灌到90mm高度时，和前面相同再做插捣，尽量排出气体。A后一层灌浆料要一次灌至两侧流出灌浆料为止。要尽量减少灌浆料对玻璃板产生的向上冲浮作用。
■从测定初始读数起，每隔2h 浇水1 次。连续浇水4 次。以后每隔4h 浇水1 次。保湿养护至要求龄期，测定3d、7d 试件高度读数。
Steps of Vertical Expansion Rate Tester for Grouting Expansion Mortar:
■ The water consumption of the grout is based on the water consumption of 250 ± 10nirn.
■ After filling the slurry with water and stirring well, it should be poured into the mold immediately and poured from one side of the glass plate. When pouring to a height of about 50mm, use a tamping board to poke 6 times on each side of the test mold, and poke 6 times in the middle. When pouring to a height of 90mm, do the same as before, and try to exhaust the gas. A layer of grouting material should be poured at one time until the grouting material flows out from both sides. It is necessary to minimize the upward flushing effect of the grout on the glass plate.
■ Fill the surface of the slurry on both sides of the glass plate, and gently wipe it into a slope with a knife. The high side of the slope is level with the glass. The lower edge of the ramp is flush with the top surface on the inside of the test pattern. The time for wiping the slope should not exceed 30s. Within 30s, cover the surface of the grout on both sides of the glass plate with two layers of wet cotton cloth.
■ Put the steel pressure block in the glass plate, and then hang the dial gauge measuring head on the steel pressure block, and record the dial indicator reading h0 within 30s to make the reading.
■ Watering 1 time every 2h from the initial reading of the measurement. Continuous watering 4 times. Watering 1 time every 4h. Moisturize and maintain to the required age, and measure the height readings of 3d and 7d test pieces.