Low-density geopolymer(LDG) mortars have been synthesized through the use of an inexpensive car-wash foaming agent. LDG mortarswere made by mixing coal fly ash and sand with activator solution of NaOH and Na₂SiO₃. The slurry mixture was then mixed with a thick foam and stirred using a hand mixer. During the stirring process, the ordinary Portland cement (OPC)was added to the mixture as additive. Once homogeneous, the slurry mixture was then poured into mortar molds and left overnight at room temperature before heat treatment at 60 C for 24 h. The geopolymer mortars formed were then characterized. The density measurement showed that the density of geopolymerdecreased to about half from the original density at the OPC compositions of 5-15% and the activator solution compositions of 20-26%. In this composition range, the highest compressive strength (2.15 MPa) was shown by the LDG synthesized using a 23% activator solution and 15% OPC. Further addition of activator solution decreased the compressive strength due to the increase of porosity. The thermal durability test indicated that the LDG structure was relatively stable up to a temperature of 300 C. A further increase in temperature would cause structural degradation.

低密度地质聚合物（LDG）砂浆是通过使用廉价的洗车发泡剂合成的。LDG砂浆是通过将粉煤灰和沙子与NaOH和Na ₂ SiO _3的活化剂溶液混合制成的。然后将淤浆混合物与浓泡沫混合并使用手动混合器搅拌。在搅拌过程中，将普通波特兰水泥（OPC）作为添加剂添加到混合物中。一旦均匀，则将浆料混合物倒入研钵模具中，并在室温下放置过夜，然后在60℃下热处理24小时。然后表征形成的地质聚合物砂浆。密度测量表明，在OPC组成为5-15％且活化剂溶液组成为20-26％时，地聚合物的密度从原始密度降低到大约一半。在该组成范围内，使用23％的活化剂溶液和15％的OPC合成的LDG显示出最高的抗压强度（2.15MPa）。由于孔隙率的增加，进一步添加活化剂溶液降低了抗压强度。